{"group":{"id":1,"name":"Community","lockable":false,"created_at":"2012-01-18T18:02:15.000Z","updated_at":"2026-04-06T14:01:22.000Z","description":"Problems submitted by members of the MATLAB Central community.","is_default":true,"created_by":161519,"badge_id":null,"featured":false,"trending":false,"solution_count_in_trending_period":0,"trending_last_calculated":"2026-04-06T00:00:00.000Z","image_id":null,"published":true,"community_created":false,"status_id":2,"is_default_group_for_player":false,"deleted_by":null,"deleted_at":null,"restored_by":null,"restored_at":null,"description_opc":null,"description_html":null,"published_at":null},"problems":[{"id":1275,"title":"Find smallest integer type to accommodate your number","description":"MATLAB supports 1-, 2-, 4-, and 8-byte storage for integer data. Find the smallest integer type to accomodate a scalar integer.\r\n\r\nE.g.\r\n\r\n a = -10;\r\n c = findclass(a)\r\n c =\r\n 'int8'\r\n\r\nor\r\n \r\n a = 300;\r\n c = findclass(a)\r\n c =\r\n 'uint16'\r\n\r\nAlways prefer unsigned integer types if the integer is greater than 0!","description_html":"\u003cp\u003eMATLAB supports 1-, 2-, 4-, and 8-byte storage for integer data. Find the smallest integer type to accomodate a scalar integer.\u003c/p\u003e\u003cp\u003eE.g.\u003c/p\u003e\u003cpre class=\"language-matlab\"\u003ea = -10;\r\nc = findclass(a)\r\nc =\r\n 'int8'\r\n\u003c/pre\u003e\u003cp\u003eor\u003c/p\u003e\u003cpre class=\"language-matlab\"\u003ea = 300;\r\nc = findclass(a)\r\nc =\r\n 'uint16'\r\n\u003c/pre\u003e\u003cp\u003eAlways prefer unsigned integer types if the integer is greater than 0!\u003c/p\u003e","function_template":"function y = findclass(x)\r\n y = x;\r\nend","test_suite":"%%\r\nx = 301;\r\ny_correct = 'uint16';\r\nassert(isequal(findclass(x),y_correct))\r\n\r\n%%\r\nx = -9999999;\r\ny_correct = 'int32';\r\nassert(isequal(findclass(x),y_correct))\r\n\r\n%%\r\nx = 6;\r\ny_correct = 'uint8';\r\nassert(isequal(findclass(x),y_correct))\r\n\r\n%%\r\nx = -100;\r\ny_correct = 'int8';\r\nassert(isequal(findclass(x),y_correct))","published":true,"deleted":false,"likes_count":3,"comments_count":0,"created_by":569,"edited_by":null,"edited_at":null,"deleted_by":null,"deleted_at":null,"solvers_count":37,"test_suite_updated_at":"2014-11-22T22:26:42.000Z","rescore_all_solutions":true,"group_id":1,"created_at":"2013-02-15T19:19:36.000Z","updated_at":"2026-03-31T13:04:41.000Z","published_at":"2013-02-15T19:19:47.000Z","restored_at":null,"restored_by":null,"spam":false,"simulink":false,"admin_reviewed":false,"description_opc":"{\"relationships\":[{\"relationshipType\":\"http://schemas.mathworks.com/matlab/code/2013/relationships/document\",\"targetMode\":\"\",\"relationshipId\":\"rId1\",\"target\":\"/matlab/document.xml\"},{\"relationshipType\":\"http://schemas.mathworks.com/matlab/code/2013/relationships/output\",\"targetMode\":\"\",\"relationshipId\":\"rId2\",\"target\":\"/matlab/output.xml\"}],\"parts\":[{\"partUri\":\"/matlab/document.xml\",\"relationship\":[],\"contentType\":\"application/vnd.mathworks.matlab.code.document+xml\",\"content\":\"\u003c?xml version=\\\"1.0\\\" encoding=\\\"UTF-8\\\"?\u003e\\n\u003cw:document xmlns:w=\\\"http://schemas.openxmlformats.org/wordprocessingml/2006/main\\\"\u003e\u003cw:body\u003e\u003cw:p\u003e\u003cw:pPr\u003e\u003cw:pStyle w:val=\\\"text\\\"/\u003e\u003c/w:pPr\u003e\u003cw:r\u003e\u003cw:t\u003eMATLAB supports 1-, 2-, 4-, and 8-byte storage for integer data. Find the smallest integer type to accomodate a scalar integer.\u003c/w:t\u003e\u003c/w:r\u003e\u003c/w:p\u003e\u003cw:p\u003e\u003cw:pPr\u003e\u003cw:pStyle w:val=\\\"text\\\"/\u003e\u003c/w:pPr\u003e\u003cw:r\u003e\u003cw:t\u003eE.g.\u003c/w:t\u003e\u003c/w:r\u003e\u003c/w:p\u003e\u003cw:p\u003e\u003cw:pPr\u003e\u003cw:pStyle w:val=\\\"code\\\"/\u003e\u003c/w:pPr\u003e\u003cw:r\u003e\u003cw:t\u003e\u003c![CDATA[a = -10;\\nc = findclass(a)\\nc =\\n 'int8']]\u003e\u003c/w:t\u003e\u003c/w:r\u003e\u003c/w:p\u003e\u003cw:p\u003e\u003cw:pPr\u003e\u003cw:pStyle w:val=\\\"text\\\"/\u003e\u003c/w:pPr\u003e\u003cw:r\u003e\u003cw:t\u003eor\u003c/w:t\u003e\u003c/w:r\u003e\u003c/w:p\u003e\u003cw:p\u003e\u003cw:pPr\u003e\u003cw:pStyle w:val=\\\"code\\\"/\u003e\u003c/w:pPr\u003e\u003cw:r\u003e\u003cw:t\u003e\u003c![CDATA[a = 300;\\nc = findclass(a)\\nc =\\n 'uint16']]\u003e\u003c/w:t\u003e\u003c/w:r\u003e\u003c/w:p\u003e\u003cw:p\u003e\u003cw:pPr\u003e\u003cw:pStyle w:val=\\\"text\\\"/\u003e\u003c/w:pPr\u003e\u003cw:r\u003e\u003cw:t\u003eAlways prefer unsigned integer types if the integer is greater than 0!\u003c/w:t\u003e\u003c/w:r\u003e\u003c/w:p\u003e\u003c/w:body\u003e\u003c/w:document\u003e\"},{\"partUri\":\"/matlab/output.xml\",\"contentType\":\"text/xml\",\"content\":\"\u003c?xml version=\\\"1.0\\\" encoding=\\\"UTF-8\\\" standalone=\\\"no\\\" ?\u003e\u003cembeddedOutputs\u003e\u003cmetaData\u003e\u003cevaluationState\u003emanual\u003c/evaluationState\u003e\u003clayoutState\u003ecode\u003c/layoutState\u003e\u003coutputStatus\u003eready\u003c/outputStatus\u003e\u003c/metaData\u003e\u003coutputArray type=\\\"array\\\"/\u003e\u003cregionArray type=\\\"array\\\"/\u003e\u003c/embeddedOutputs\u003e\"}]}"},{"id":1262,"title":"Convert elements in numeric array into different class","description":"Write a function that converts elements in a numeric array into a different class. Example:\r\n\r\n a = [1:5]; % class: double\r\n b = convertto(a,'uint32');\r\n b =\r\n 1 2 3 4 5\r\n \r\n class(b)\r\n ans =\r\n uint32\r\n\r\n","description_html":"\u003cp\u003eWrite a function that converts elements in a numeric array into a different class. Example:\u003c/p\u003e\u003cpre class=\"language-matlab\"\u003ea = [1:5]; % class: double\r\nb = convertto(a,'uint32');\r\nb =\r\n 1 2 3 4 5\r\n\u003c/pre\u003e\u003cpre class=\"language-matlab\"\u003eclass(b)\r\n ans =\r\n uint32\r\n\u003c/pre\u003e","function_template":"function y = convertto(x,c)\r\n y = x;\r\nend","test_suite":"%%\r\nx = [1 2 3 4 5];\r\nc = 'uint32';\r\ny_correct = 'uint32';\r\nassert(strcmp(class(convertto(x,c)),y_correct) \u0026\u0026 isequal(x,convertto(x,c)))\r\n\r\n\r\n%%\r\nx = [4 7 0 3 2 2];\r\nc = 'int16';\r\ny_correct = 'int16';\r\nassert(strcmp(class(convertto(x,c)),y_correct) \u0026\u0026 isequal(x,convertto(x,c)))\r\n","published":true,"deleted":false,"likes_count":1,"comments_count":1,"created_by":569,"edited_by":null,"edited_at":null,"deleted_by":null,"deleted_at":null,"solvers_count":59,"test_suite_updated_at":null,"rescore_all_solutions":false,"group_id":1,"created_at":"2013-02-11T12:36:11.000Z","updated_at":"2024-11-30T18:25:21.000Z","published_at":"2013-02-11T12:36:11.000Z","restored_at":null,"restored_by":null,"spam":false,"simulink":false,"admin_reviewed":false,"description_opc":"{\"relationships\":[{\"relationshipType\":\"http://schemas.mathworks.com/matlab/code/2013/relationships/document\",\"targetMode\":\"\",\"relationshipId\":\"rId1\",\"target\":\"/matlab/document.xml\"},{\"relationshipType\":\"http://schemas.mathworks.com/matlab/code/2013/relationships/output\",\"targetMode\":\"\",\"relationshipId\":\"rId2\",\"target\":\"/matlab/output.xml\"}],\"parts\":[{\"partUri\":\"/matlab/document.xml\",\"relationship\":[],\"contentType\":\"application/vnd.mathworks.matlab.code.document+xml\",\"content\":\"\u003c?xml version=\\\"1.0\\\" encoding=\\\"UTF-8\\\"?\u003e\\n\u003cw:document xmlns:w=\\\"http://schemas.openxmlformats.org/wordprocessingml/2006/main\\\"\u003e\u003cw:body\u003e\u003cw:p\u003e\u003cw:pPr\u003e\u003cw:pStyle w:val=\\\"text\\\"/\u003e\u003c/w:pPr\u003e\u003cw:r\u003e\u003cw:t\u003eWrite a function that converts elements in a numeric array into a different class. Example:\u003c/w:t\u003e\u003c/w:r\u003e\u003c/w:p\u003e\u003cw:p\u003e\u003cw:pPr\u003e\u003cw:pStyle w:val=\\\"code\\\"/\u003e\u003c/w:pPr\u003e\u003cw:r\u003e\u003cw:t\u003e\u003c![CDATA[a = [1:5]; % class: double\\nb = convertto(a,'uint32');\\nb =\\n 1 2 3 4 5\\n\\nclass(b)\\n ans =\\n uint32]]\u003e\u003c/w:t\u003e\u003c/w:r\u003e\u003c/w:p\u003e\u003c/w:body\u003e\u003c/w:document\u003e\"},{\"partUri\":\"/matlab/output.xml\",\"contentType\":\"text/xml\",\"content\":\"\u003c?xml version=\\\"1.0\\\" encoding=\\\"UTF-8\\\" standalone=\\\"no\\\" ?\u003e\u003cembeddedOutputs\u003e\u003cmetaData\u003e\u003cevaluationState\u003emanual\u003c/evaluationState\u003e\u003clayoutState\u003ecode\u003c/layoutState\u003e\u003coutputStatus\u003eready\u003c/outputStatus\u003e\u003c/metaData\u003e\u003coutputArray type=\\\"array\\\"/\u003e\u003cregionArray type=\\\"array\\\"/\u003e\u003c/embeddedOutputs\u003e\"}]}"},{"id":2003,"title":"Check if integer","description":"Given a vector of elements, determine if each element is an integer and return true or false accordingly.","description_html":"\u003cp\u003eGiven a vector of elements, determine if each element is an integer and return true or false accordingly.\u003c/p\u003e","function_template":"function y = checkIfinteger(x)\r\n y = x;\r\nend","test_suite":"%%\r\nx = [1 2.2 3.3 4];\r\ny_correct = [true false false true];\r\nassert(isequal(checkIfinteger(x),y_correct))\r\n\r\n%%\r\nx = [-1 2 3.3 4 -7.54];\r\ny_correct = [true true false true false];\r\nassert(isequal(checkIfinteger(x),y_correct))\r\n\r\n%%\r\nx = [pi 2.2 single(3.78) -4.34 eps inf] ;\r\ny_correct = [false false false false false false];\r\nassert(isequal(checkIfinteger(x),y_correct))\r\n\r\n%%\r\nx = [1.0 0 nan -6.0]; % infact nan is 'not a number'\r\ny_correct = [true true false true];\r\nassert(isequal(checkIfinteger(x),y_correct))\r\n\r\n%%\r\nx = [true false logical(0) logical(1)]\r\ny_correct = [false false false false];\r\nassert(isequal(checkIfinteger(x),y_correct))\r\n\r\n%%\r\nx = ['1' '2' 'a' 'b' '!']\r\ny_correct = [false false false false false];\r\nassert(isequal(checkIfinteger(x),y_correct))\r\n\r\n\r\n","published":true,"deleted":false,"likes_count":1,"comments_count":4,"created_by":18241,"edited_by":null,"edited_at":null,"deleted_by":null,"deleted_at":null,"solvers_count":65,"test_suite_updated_at":"2013-11-18T13:30:09.000Z","rescore_all_solutions":false,"group_id":1,"created_at":"2013-11-17T16:36:10.000Z","updated_at":"2025-12-02T11:17:21.000Z","published_at":"2013-11-17T16:53:26.000Z","restored_at":null,"restored_by":null,"spam":false,"simulink":false,"admin_reviewed":false,"description_opc":"{\"relationships\":[{\"relationshipType\":\"http://schemas.mathworks.com/matlab/code/2013/relationships/document\",\"relationshipId\":\"rId1\",\"target\":\"/matlab/document.xml\"},{\"relationshipType\":\"http://schemas.mathworks.com/matlab/code/2013/relationships/output\",\"relationshipId\":\"rId2\",\"target\":\"/matlab/output.xml\"}],\"parts\":[{\"partUri\":\"/matlab/document.xml\",\"relationship\":[],\"contentType\":\"application/vnd.mathworks.matlab.code.document+xml\",\"content\":\"\u003c?xml version=\\\"1.0\\\" encoding=\\\"UTF-8\\\"?\u003e\u003cw:document xmlns:w=\\\"http://schemas.openxmlformats.org/wordprocessingml/2006/main\\\"\u003e\u003cw:body\u003e\u003cw:p\u003e\u003cw:pPr\u003e\u003cw:pStyle w:val=\\\"text\\\"/\u003e\u003c/w:pPr\u003e\u003cw:r\u003e\u003cw:t\u003eGiven a vector of elements, determine if each element is an integer and return true or false accordingly.\u003c/w:t\u003e\u003c/w:r\u003e\u003c/w:p\u003e\u003c/w:body\u003e\u003c/w:document\u003e\"},{\"partUri\":\"/matlab/output.xml\",\"contentType\":\"text/xml\",\"content\":\"\u003c?xml version=\\\"1.0\\\" encoding=\\\"UTF-8\\\" standalone=\\\"no\\\" ?\u003e\u003cembeddedOutputs\u003e\u003cmetaData\u003e\u003cevaluationState\u003emanual\u003c/evaluationState\u003e\u003clayoutState\u003ecode\u003c/layoutState\u003e\u003coutputStatus\u003eready\u003c/outputStatus\u003e\u003c/metaData\u003e\u003coutputArray type=\\\"array\\\"/\u003e\u003cregionArray type=\\\"array\\\"/\u003e\u003c/embeddedOutputs\u003e\"}]}"},{"id":44262,"title":"Multivariate polynomials - overload multiplication","description":"Problems \u003chttps://www.mathworks.com/matlabcentral/cody/problems/44260-multivariate-polynomials-convert-monomial-form-to-array 44260\u003e and \u003chttps://www.mathworks.com/matlabcentral/cody/problems/44261-sort-multivariate-monomials 44261\u003e work with a monomial representation of multivariate polynomials. This has two parts, a matrix |exponents| with a row of exponents for each monomial, and a column vector |coefficients| with a coefficient for each monomial.\r\n\r\nIt would be nice to define polynomials so they can be multiplied using simple notation:\r\n\r\n p = p1*p2;\r\n\r\nThis can be done by \u003chttps://www.mathworks.com/help/matlab/matlab_oop/user-defined-classes.html defining a class\u003e |mPoly| with two properties, |exponents| and |coefficients|, and two methods: a \u003chttps://www.mathworks.com/help/matlab/matlab_oop/class-constructor-methods.html constructor\u003e with the syntax\r\n\r\n p = mPoly(exponents, coefficients)\r\n\r\nand a method \u003chttps://www.mathworks.com/help/matlab/ref/mtimes.html?searchHighlight=mtimes\u0026s_tid=doc_srchtitle mtimes\u003e for multiplying two polynomials. You can assume that the polynomials being multiplied have the same number of variables.\r\n","description_html":"\u003cp\u003eProblems \u003ca href = \"https://www.mathworks.com/matlabcentral/cody/problems/44260-multivariate-polynomials-convert-monomial-form-to-array\"\u003e44260\u003c/a\u003e and \u003ca href = \"https://www.mathworks.com/matlabcentral/cody/problems/44261-sort-multivariate-monomials\"\u003e44261\u003c/a\u003e work with a monomial representation of multivariate polynomials. This has two parts, a matrix \u003ctt\u003eexponents\u003c/tt\u003e with a row of exponents for each monomial, and a column vector \u003ctt\u003ecoefficients\u003c/tt\u003e with a coefficient for each monomial.\u003c/p\u003e\u003cp\u003eIt would be nice to define polynomials so they can be multiplied using simple notation:\u003c/p\u003e\u003cpre class=\"language-matlab\"\u003ep = p1*p2;\r\n\u003c/pre\u003e\u003cp\u003eThis can be done by \u003ca href = \"https://www.mathworks.com/help/matlab/matlab_oop/user-defined-classes.html\"\u003edefining a class\u003c/a\u003e \u003ctt\u003emPoly\u003c/tt\u003e with two properties, \u003ctt\u003eexponents\u003c/tt\u003e and \u003ctt\u003ecoefficients\u003c/tt\u003e, and two methods: a \u003ca href = \"https://www.mathworks.com/help/matlab/matlab_oop/class-constructor-methods.html\"\u003econstructor\u003c/a\u003e with the syntax\u003c/p\u003e\u003cpre class=\"language-matlab\"\u003ep = mPoly(exponents, coefficients)\r\n\u003c/pre\u003e\u003cp\u003eand a method \u003ca href = \"https://www.mathworks.com/help/matlab/ref/mtimes.html?searchHighlight=mtimes\u0026s_tid=doc_srchtitle\"\u003emtimes\u003c/a\u003e for multiplying two polynomials. You can assume that the polynomials being multiplied have the same number of variables.\u003c/p\u003e","function_template":"classdef mPoly \r\n %MPOLY Class of multivariate polynomials\r\n \r\n properties\r\n exponents\r\n coefficients\r\n end\r\n \r\n methods\r\n function p = mPoly(ex,co)\r\n end\r\n function p = mtimes(p1,p2)\r\n end\r\n end\r\n \r\nend\r\n","test_suite":"%% Test polyMult\r\nfiletext = fileread('mPoly.m');\r\nassert(~contains(filetext,'regexp'))\r\n\r\n%% p1 = A, p2 = B\r\nc1 = randi(1000); c2 = randi(1000);\r\ne = 0;\r\np1 = mPoly(e,c1);\r\np2 = mPoly(e,c2);\r\np = p1*p2;\r\nassert(isequal(c1*c2,p.coefficients))\r\nassert(isequal(e,p.exponents))\r\n\r\n%% p1 = y-x^2, p2 = x-2\r\ne1 = [2 0; 0 1];\r\nc1 = [-1; 1];\r\ne2 = [1 0; 0 0];\r\nc2 = [1; -2];\r\np1 = mPoly(e1,c1);\r\np2 = mPoly(e2,c2);\r\np = p1*p2;\r\n\r\n[e,idx] = unique(p.exponents,'rows');\r\nc = p.coefficients(idx);\r\nassert(isequal(e,[0 1; 1 1; 2 0; 3 0]))\r\nassert(isequal(c,[-2; 1; 2; -1]))\r\n\r\n%% p1 = y-x^2, p2 = z-2\r\ne1 = [0 1 0; 2 0 0];\r\nc1 = [1; -1];\r\ne2 = [0 0 1; 0 0 0];\r\nc2 = [1; -2];\r\np1 = mPoly(e1,c1);\r\np2 = mPoly(e2,c2);\r\np = p1*p2;\r\n\r\n[e,idx] = unique(p.exponents,'rows');\r\nc = p.coefficients(idx);\r\nassert(isequal(e,[0 1 0; 0 1 1; 2 0 0; 2 0 1]))\r\nassert(isequal(c,[-2; 1; 2; -1]))\r\n\r\n\r\n%% p1 = z-x^3, p2 = x^2+y^2+z^2-1\r\ne1 = [0 0 1; 3 0 0];\r\nc1 = [1; -1];\r\ne2 = [2 0 0; 0 2 0; 0 0 2; 0 0 0];\r\nc2 = [1; 1; 1; -1];\r\n\r\np1 = mPoly(e1,c1);\r\np2 = mPoly(e2,c2);\r\np = p1*p2;\r\n\r\n[e,idx] = unique(p.exponents,'rows');\r\nc = p.coefficients(idx);\r\nassert(isequal(e,[0 0 1; 0 0 3; 0 2 1; 2 0 1; 3 0 0; 3 0 2; 3 2 0; 5 0 0]))\r\nassert(isequal(c,[-1 1 1 1 1 -1 -1 -1]'))\r\n\r\n%% Commutative\r\nc1 = randi(1000,[2 1]);\r\ne1 = randi(1000,[2 2]);\r\nc2 = randi(1000,[3 1]);\r\ne2 = randi(1000,[3 2]);\r\np1 = mPoly(e1,c1);\r\np2 = mPoly(e2,c2);\r\np12 = p1*p2;\r\np21 = p2*p1;\r\n[e12,i12] = unique(p12.exponents,'rows');\r\n[e21,i21] = unique(p21.exponents,'rows');\r\nc12 = p12.coefficients(i12);\r\nc21 = p21.coefficients(i21);\r\nassert(isequal(e12,e21))\r\nassert(isequal(c12,c21))","published":true,"deleted":false,"likes_count":0,"comments_count":1,"created_by":1011,"edited_by":null,"edited_at":null,"deleted_by":null,"deleted_at":null,"solvers_count":13,"test_suite_updated_at":null,"rescore_all_solutions":false,"group_id":1,"created_at":"2017-07-14T04:04:05.000Z","updated_at":"2025-12-22T13:16:38.000Z","published_at":"2017-07-14T04:04:05.000Z","restored_at":null,"restored_by":null,"spam":false,"simulink":false,"admin_reviewed":false,"description_opc":"{\"relationships\":[{\"relationshipType\":\"http://schemas.mathworks.com/matlab/code/2013/relationships/document\",\"targetMode\":\"\",\"relationshipId\":\"rId1\",\"target\":\"/matlab/document.xml\"},{\"relationshipType\":\"http://schemas.mathworks.com/matlab/code/2013/relationships/output\",\"targetMode\":\"\",\"relationshipId\":\"rId2\",\"target\":\"/matlab/output.xml\"}],\"parts\":[{\"partUri\":\"/matlab/document.xml\",\"relationship\":[],\"contentType\":\"application/vnd.mathworks.matlab.code.document+xml\",\"content\":\"\u003c?xml version=\\\"1.0\\\" encoding=\\\"UTF-8\\\"?\u003e\\n\u003cw:document xmlns:w=\\\"http://schemas.openxmlformats.org/wordprocessingml/2006/main\\\"\u003e\u003cw:body\u003e\u003cw:p\u003e\u003cw:pPr\u003e\u003cw:pStyle w:val=\\\"text\\\"/\u003e\u003c/w:pPr\u003e\u003cw:r\u003e\u003cw:t\u003eProblems\u003c/w:t\u003e\u003c/w:r\u003e\u003cw:r\u003e\u003cw:t\u003e \u003c/w:t\u003e\u003c/w:r\u003e\u003cw:hyperlink w:docLocation=\\\"https://www.mathworks.com/matlabcentral/cody/problems/44260-multivariate-polynomials-convert-monomial-form-to-array\\\"\u003e\u003cw:r\u003e\u003cw:t\u003e44260\u003c/w:t\u003e\u003c/w:r\u003e\u003c/w:hyperlink\u003e\u003cw:r\u003e\u003cw:t\u003e and\u003c/w:t\u003e\u003c/w:r\u003e\u003cw:r\u003e\u003cw:t\u003e \u003c/w:t\u003e\u003c/w:r\u003e\u003cw:hyperlink w:docLocation=\\\"https://www.mathworks.com/matlabcentral/cody/problems/44261-sort-multivariate-monomials\\\"\u003e\u003cw:r\u003e\u003cw:t\u003e44261\u003c/w:t\u003e\u003c/w:r\u003e\u003c/w:hyperlink\u003e\u003cw:r\u003e\u003cw:t\u003e work with a monomial representation of multivariate polynomials. This has two parts, a matrix\u003c/w:t\u003e\u003c/w:r\u003e\u003cw:r\u003e\u003cw:t\u003e \u003c/w:t\u003e\u003c/w:r\u003e\u003cw:r\u003e\u003cw:rPr\u003e\u003cw:rFonts w:cs=\\\"monospace\\\"/\u003e\u003c/w:rPr\u003e\u003cw:t\u003eexponents\u003c/w:t\u003e\u003c/w:r\u003e\u003cw:r\u003e\u003cw:t\u003e with a row of exponents for each monomial, and a column vector\u003c/w:t\u003e\u003c/w:r\u003e\u003cw:r\u003e\u003cw:t\u003e \u003c/w:t\u003e\u003c/w:r\u003e\u003cw:r\u003e\u003cw:rPr\u003e\u003cw:rFonts w:cs=\\\"monospace\\\"/\u003e\u003c/w:rPr\u003e\u003cw:t\u003ecoefficients\u003c/w:t\u003e\u003c/w:r\u003e\u003cw:r\u003e\u003cw:t\u003e with a coefficient for each monomial.\u003c/w:t\u003e\u003c/w:r\u003e\u003c/w:p\u003e\u003cw:p\u003e\u003cw:pPr\u003e\u003cw:pStyle w:val=\\\"text\\\"/\u003e\u003c/w:pPr\u003e\u003cw:r\u003e\u003cw:t\u003eIt would be nice to define polynomials so they can be multiplied using simple notation:\u003c/w:t\u003e\u003c/w:r\u003e\u003c/w:p\u003e\u003cw:p\u003e\u003cw:pPr\u003e\u003cw:pStyle w:val=\\\"code\\\"/\u003e\u003c/w:pPr\u003e\u003cw:r\u003e\u003cw:t\u003e\u003c![CDATA[p = p1*p2;]]\u003e\u003c/w:t\u003e\u003c/w:r\u003e\u003c/w:p\u003e\u003cw:p\u003e\u003cw:pPr\u003e\u003cw:pStyle w:val=\\\"text\\\"/\u003e\u003c/w:pPr\u003e\u003cw:r\u003e\u003cw:t\u003eThis can be done by\u003c/w:t\u003e\u003c/w:r\u003e\u003cw:r\u003e\u003cw:t\u003e \u003c/w:t\u003e\u003c/w:r\u003e\u003cw:hyperlink w:docLocation=\\\"https://www.mathworks.com/help/matlab/matlab_oop/user-defined-classes.html\\\"\u003e\u003cw:r\u003e\u003cw:t\u003edefining a class\u003c/w:t\u003e\u003c/w:r\u003e\u003c/w:hyperlink\u003e\u003cw:r\u003e\u003cw:t\u003e \u003c/w:t\u003e\u003c/w:r\u003e\u003cw:r\u003e\u003cw:rPr\u003e\u003cw:rFonts w:cs=\\\"monospace\\\"/\u003e\u003c/w:rPr\u003e\u003cw:t\u003emPoly\u003c/w:t\u003e\u003c/w:r\u003e\u003cw:r\u003e\u003cw:t\u003e with two properties,\u003c/w:t\u003e\u003c/w:r\u003e\u003cw:r\u003e\u003cw:t\u003e \u003c/w:t\u003e\u003c/w:r\u003e\u003cw:r\u003e\u003cw:rPr\u003e\u003cw:rFonts w:cs=\\\"monospace\\\"/\u003e\u003c/w:rPr\u003e\u003cw:t\u003eexponents\u003c/w:t\u003e\u003c/w:r\u003e\u003cw:r\u003e\u003cw:t\u003e and\u003c/w:t\u003e\u003c/w:r\u003e\u003cw:r\u003e\u003cw:t\u003e \u003c/w:t\u003e\u003c/w:r\u003e\u003cw:r\u003e\u003cw:rPr\u003e\u003cw:rFonts w:cs=\\\"monospace\\\"/\u003e\u003c/w:rPr\u003e\u003cw:t\u003ecoefficients\u003c/w:t\u003e\u003c/w:r\u003e\u003cw:r\u003e\u003cw:t\u003e, and two methods: a\u003c/w:t\u003e\u003c/w:r\u003e\u003cw:r\u003e\u003cw:t\u003e \u003c/w:t\u003e\u003c/w:r\u003e\u003cw:hyperlink w:docLocation=\\\"https://www.mathworks.com/help/matlab/matlab_oop/class-constructor-methods.html\\\"\u003e\u003cw:r\u003e\u003cw:t\u003econstructor\u003c/w:t\u003e\u003c/w:r\u003e\u003c/w:hyperlink\u003e\u003cw:r\u003e\u003cw:t\u003e with the syntax\u003c/w:t\u003e\u003c/w:r\u003e\u003c/w:p\u003e\u003cw:p\u003e\u003cw:pPr\u003e\u003cw:pStyle w:val=\\\"code\\\"/\u003e\u003c/w:pPr\u003e\u003cw:r\u003e\u003cw:t\u003e\u003c![CDATA[p = mPoly(exponents, coefficients)]]\u003e\u003c/w:t\u003e\u003c/w:r\u003e\u003c/w:p\u003e\u003cw:p\u003e\u003cw:pPr\u003e\u003cw:pStyle w:val=\\\"text\\\"/\u003e\u003c/w:pPr\u003e\u003cw:r\u003e\u003cw:t\u003eand a method\u003c/w:t\u003e\u003c/w:r\u003e\u003cw:r\u003e\u003cw:t\u003e \u003c/w:t\u003e\u003c/w:r\u003e\u003cw:hyperlink w:docLocation=\\\"https://www.mathworks.com/help/matlab/ref/mtimes.html?searchHighlight=mtimes\u0026amp;s_tid=doc_srchtitle\\\"\u003e\u003cw:r\u003e\u003cw:t\u003emtimes\u003c/w:t\u003e\u003c/w:r\u003e\u003c/w:hyperlink\u003e\u003cw:r\u003e\u003cw:t\u003e for multiplying two polynomials. You can assume that the polynomials being multiplied have the same number of variables.\u003c/w:t\u003e\u003c/w:r\u003e\u003c/w:p\u003e\u003c/w:body\u003e\u003c/w:document\u003e\"},{\"partUri\":\"/matlab/output.xml\",\"contentType\":\"text/xml\",\"content\":\"\u003c?xml version=\\\"1.0\\\" encoding=\\\"UTF-8\\\" standalone=\\\"no\\\" ?\u003e\u003cembeddedOutputs\u003e\u003cmetaData\u003e\u003cevaluationState\u003emanual\u003c/evaluationState\u003e\u003clayoutState\u003ecode\u003c/layoutState\u003e\u003coutputStatus\u003eready\u003c/outputStatus\u003e\u003c/metaData\u003e\u003coutputArray type=\\\"array\\\"/\u003e\u003cregionArray type=\\\"array\\\"/\u003e\u003c/embeddedOutputs\u003e\"}]}"},{"id":42710,"title":"Cleaner","description":"Write a code _cleaner_ which creates variable/object that can clear current workspace when used.\r\nMissing semicolon (\";\") in line returning that \"thing\" will activate cleaning.\r\nExample:\r\n\r\n \u003e\u003e x = 1; y = 2; z = 3;\r\n \u003e\u003e a = cleaner;\r\n \u003e\u003e b = a;\r\n \u003e\u003e who\r\n\r\n Your variables are:\r\n a b x y z \r\n \r\n \u003e\u003e b\r\n \u003e\u003e who\r\n \r\n Your variables are:\r\n b\r\n \r\n \u003e\u003e c = b\r\n \u003e\u003e who\r\n \r\n Your variables are:\r\n c\r\n \r\n \u003e\u003e z = 7\r\n \r\n z = \r\n 7\r\n\r\n \u003e\u003e cleaner\r\n \u003e\u003e who\r\n \r\n Your variables are:\r\n ans\r\n ","description_html":"\u003cp\u003eWrite a code \u003ci\u003ecleaner\u003c/i\u003e which creates variable/object that can clear current workspace when used.\r\nMissing semicolon (\";\") in line returning that \"thing\" will activate cleaning.\r\nExample:\u003c/p\u003e\u003cpre\u003e \u0026gt;\u0026gt; x = 1; y = 2; z = 3;\r\n \u0026gt;\u0026gt; a = cleaner;\r\n \u0026gt;\u0026gt; b = a;\r\n \u0026gt;\u0026gt; who\u003c/pre\u003e\u003cpre\u003e Your variables are:\r\n a b x y z \u003c/pre\u003e\u003cpre\u003e \u0026gt;\u0026gt; b\r\n \u0026gt;\u0026gt; who\u003c/pre\u003e\u003cpre\u003e Your variables are:\r\n b\u003c/pre\u003e\u003cpre\u003e \u0026gt;\u0026gt; c = b\r\n \u0026gt;\u0026gt; who\u003c/pre\u003e\u003cpre\u003e Your variables are:\r\n c\u003c/pre\u003e\u003cpre\u003e \u0026gt;\u0026gt; z = 7\u003c/pre\u003e\u003cpre\u003e z = \r\n 7\u003c/pre\u003e\u003cpre\u003e \u0026gt;\u0026gt; cleaner\r\n \u0026gt;\u0026gt; who\u003c/pre\u003e\u003cpre\u003e Your variables are:\r\n ans\u003c/pre\u003e","function_template":"function obj = cleaner\r\n % or classdef?\r\n clear\r\nend","test_suite":"%%\r\n%{\r\n╔═══════════════════════════════════════════╗\r\n║ Please, play against the given problem, ║\r\n║ not against weaknesses of the Test Suite. ║\r\n║ There is no 100% efficient method to ║\r\n║ prevent cheating solutions, so there is ║\r\n║ no extra protection used. I'd be happy if ║\r\n║ there were no solutions with code hidden ║\r\n║ in strings only to decrease the \"size\". ║\r\n║ Little hacks, used in order to complete ║\r\n║ the task, are allowed, but please don't ║\r\n║ change the filename. All suggestions are ║\r\n║ welkome. ║\r\n║ Thanks \u0026 have fun. Jan ║\r\n╚═══════════════════════════════════════════╝\r\n%}\r\n%%\r\nx = 1;\r\ny_correct = 1;\r\nb = cleaner\r\n% no \";\" only \"b\" stays alive\r\nassert(numel(who)==1)\r\n%%\r\nx = 1;\r\ny_correct = 1;\r\nb = cleaner;\r\n% cleaner not activated\r\nassert(numel(who)==3)\r\n%%\r\nx = 1;\r\ny_correct = 1;\r\nz = 'hello'\r\nb = {cleaner}\r\n% cleaner wrapped in cell, no action\r\nassert(numel(who)==4)\r\n%%\r\nx = 1;\r\ny_correct = 1;\r\nb = cleaner;\r\nassert(isequal(who,{'b';'x';'y_correct'}))\r\nb\r\nassert(isequal(who,{'b'}))\r\n%%\r\nb1 = cleaner;\r\nb2 = cleaner;\r\nb3 = cleaner;\r\nb4 = cleaner;\r\nassert(isequal(who,{'b1';'b2';'b3';'b4'}))\r\nassert(isequal(b1,b2,b3,b4,cleaner))\r\nb3\r\n% clean other cleaners, only \"b3\" survives here\r\nassert(isequal(who,{'b3'}))\r\n%%\r\nx = 1;\r\ny_correct = 1;\r\nb = cleaner\r\nassert(numel(who)==1)\r\nx = 1; \r\ny = 2\r\nassert(numel(who)==3)\r\na = b\r\nassert(isequal(who,{'a'}))\r\n%%\r\n% cleaning other workspace (of created below function in temp.m)\r\n%{\r\nfunction out = temp(in)\r\n x = 1;\r\n y = 2;\r\n assert(numel(who)==3)\r\n k = in\r\n out = who;\r\nend\r\n%}\r\nf1 = fopen('temp.m','w');\r\nfprintf(f1,'function out=temp(in)\\n x=1;\\n y=2;\\n assert(numel(who)==3)\\n k=in\\n out=who;\\nend');\r\nfclose(f1);\r\nclear;\r\nx = 1;\r\ny = 2;\r\nz = cleaner;\r\na = temp(z)\r\nassert(isequal(who,{'a';'x';'y';'z'}))\r\nassert(isequal(a,{'k'}))\r\n","published":true,"deleted":false,"likes_count":2,"comments_count":0,"created_by":14358,"edited_by":null,"edited_at":null,"deleted_by":null,"deleted_at":null,"solvers_count":7,"test_suite_updated_at":"2016-01-22T12:47:33.000Z","rescore_all_solutions":true,"group_id":1,"created_at":"2016-01-13T11:14:47.000Z","updated_at":"2016-01-22T12:47:33.000Z","published_at":"2016-01-13T11:40:23.000Z","restored_at":null,"restored_by":null,"spam":false,"simulink":false,"admin_reviewed":false,"description_opc":"{\"relationships\":[{\"relationshipType\":\"http://schemas.mathworks.com/matlab/code/2013/relationships/document\",\"targetMode\":\"\",\"relationshipId\":\"rId1\",\"target\":\"/matlab/document.xml\"},{\"relationshipType\":\"http://schemas.mathworks.com/matlab/code/2013/relationships/output\",\"targetMode\":\"\",\"relationshipId\":\"rId2\",\"target\":\"/matlab/output.xml\"}],\"parts\":[{\"partUri\":\"/matlab/document.xml\",\"relationship\":[],\"contentType\":\"application/vnd.mathworks.matlab.code.document+xml\",\"content\":\"\u003c?xml version=\\\"1.0\\\" encoding=\\\"UTF-8\\\"?\u003e\\n\u003cw:document xmlns:w=\\\"http://schemas.openxmlformats.org/wordprocessingml/2006/main\\\"\u003e\u003cw:body\u003e\u003cw:p\u003e\u003cw:pPr\u003e\u003cw:pStyle w:val=\\\"text\\\"/\u003e\u003c/w:pPr\u003e\u003cw:r\u003e\u003cw:t\u003eWrite a code\u003c/w:t\u003e\u003c/w:r\u003e\u003cw:r\u003e\u003cw:t\u003e \u003c/w:t\u003e\u003c/w:r\u003e\u003cw:r\u003e\u003cw:rPr\u003e\u003cw:i/\u003e\u003c/w:rPr\u003e\u003cw:t\u003ecleaner\u003c/w:t\u003e\u003c/w:r\u003e\u003cw:r\u003e\u003cw:t\u003e which creates variable/object that can clear current workspace when used. Missing semicolon (\\\";\\\") in line returning that \\\"thing\\\" will activate cleaning. Example:\u003c/w:t\u003e\u003c/w:r\u003e\u003c/w:p\u003e\u003cw:p\u003e\u003cw:pPr\u003e\u003cw:pStyle w:val=\\\"code\\\"/\u003e\u003c/w:pPr\u003e\u003cw:r\u003e\u003cw:t\u003e\u003c![CDATA[ \u003e\u003e x = 1; y = 2; z = 3;\\n \u003e\u003e a = cleaner;\\n \u003e\u003e b = a;\\n \u003e\u003e who\\n\\n Your variables are:\\n a b x y z \\n\\n \u003e\u003e b\\n \u003e\u003e who\\n\\n Your variables are:\\n b\\n\\n \u003e\u003e c = b\\n \u003e\u003e who\\n\\n Your variables are:\\n c\\n\\n \u003e\u003e z = 7\\n\\n z = \\n 7\\n\\n \u003e\u003e cleaner\\n \u003e\u003e who\\n\\n Your variables are:\\n ans]]\u003e\u003c/w:t\u003e\u003c/w:r\u003e\u003c/w:p\u003e\u003c/w:body\u003e\u003c/w:document\u003e\"},{\"partUri\":\"/matlab/output.xml\",\"contentType\":\"text/xml\",\"content\":\"\u003c?xml version=\\\"1.0\\\" encoding=\\\"UTF-8\\\" standalone=\\\"no\\\" ?\u003e\u003cembeddedOutputs\u003e\u003cmetaData\u003e\u003cevaluationState\u003emanual\u003c/evaluationState\u003e\u003clayoutState\u003ecode\u003c/layoutState\u003e\u003coutputStatus\u003eready\u003c/outputStatus\u003e\u003c/metaData\u003e\u003coutputArray type=\\\"array\\\"/\u003e\u003cregionArray type=\\\"array\\\"/\u003e\u003c/embeddedOutputs\u003e\"}]}"},{"id":2836,"title":"Modify subscripts - easier","description":"MATLAB supports object-oriented programming. Let's take an advantage of it in cody.\r\n\r\nThis problem focus on modifying subscripted references for class double.\r\n\r\nThis example shows classical behavior: \r\n\r\n \u003e\u003e A = [1 4 7\r\n 2 5 8\r\n 3 6 9];\r\n \u003e\u003e A([1 3], [3 1])\r\n\r\n ans =\r\n\r\n 7 1\r\n 9 3\r\n\r\nWhile this is what I am looking for:\r\n\r\n \u003e\u003e modified_A = sub_double(A);\r\n \u003e\u003e modified_A([1 3], [3 1])\r\n \r\n ans = \r\n \r\n 7 3\r\n\r\n \u003e\u003e modified_A([1 2 2], [3 1 2])\r\n \r\n ans = \r\n \r\n 7 2 5\r\n\r\nIf there are given two subscripts vectors of the same lenght, return only those values which correspond to paired subscriptions.\r\n\r\n*Task*: You are given class template. Complete it to achieve desired behaviour.\r\n\r\nAdditional info:\r\n\r\n\r\n* If you are not familiar with classes in MATLAB you can find more information \u003chttp://www.mathworks.com/help/matlab/matlab_oop/class-definition.html here\u003e and \u003chttp://www.mathworks.com/help/matlab/customize-matlab-behavior.html here\u003e or you can find it typing:\r\n\r\n \u003e\u003e doc 'Class Definition'\r\n \u003e\u003e doc 'Customize MATLAB Behavior'\r\n \r\n \r\n* Feel free to modify the template,\r\n* You can try your skills to write a function instead of a class. You can use anonymus functions, etc.,\r\n* Using classes open another doors to cheat (easily). This is not a hacking problem, so please respect it (you can create some new, interesting problems :-) ),\r\n* In this form it is solvable without using function \"builtin\" which is forbidden in cody. I can allow it in the testsuite if there will be need for it,\r\n* Look for more problems using tags below\r\n\r\nEnjoy!","description_html":"\u003cp\u003eMATLAB supports object-oriented programming. Let's take an advantage of it in cody.\u003c/p\u003e\u003cp\u003eThis problem focus on modifying subscripted references for class double.\u003c/p\u003e\u003cp\u003eThis example shows classical behavior:\u003c/p\u003e\u003cpre class=\"language-matlab\"\u003e\u0026gt;\u0026gt; A = [1 4 7\r\n 2 5 8\r\n 3 6 9];\r\n\u0026gt;\u0026gt; A([1 3], [3 1])\r\n\u003c/pre\u003e\u003cpre class=\"language-matlab\"\u003eans =\r\n\u003c/pre\u003e\u003cpre\u003e 7 1\r\n 9 3\u003c/pre\u003e\u003cp\u003eWhile this is what I am looking for:\u003c/p\u003e\u003cpre class=\"language-matlab\"\u003e\u0026gt;\u0026gt; modified_A = sub_double(A);\r\n\u0026gt;\u0026gt; modified_A([1 3], [3 1])\r\n\u003c/pre\u003e\u003cpre class=\"language-matlab\"\u003eans = \r\n\u003c/pre\u003e\u003cpre\u003e 7 3\u003c/pre\u003e\u003cpre class=\"language-matlab\"\u003e\u0026gt;\u0026gt; modified_A([1 2 2], [3 1 2])\r\n\u003c/pre\u003e\u003cpre class=\"language-matlab\"\u003eans = \r\n\u003c/pre\u003e\u003cpre\u003e 7 2 5\u003c/pre\u003e\u003cp\u003eIf there are given two subscripts vectors of the same lenght, return only those values which correspond to paired subscriptions.\u003c/p\u003e\u003cp\u003e\u003cb\u003eTask\u003c/b\u003e: You are given class template. Complete it to achieve desired behaviour.\u003c/p\u003e\u003cp\u003eAdditional info:\u003c/p\u003e\u003cul\u003e\u003cli\u003eIf you are not familiar with classes in MATLAB you can find more information \u003ca href = \"http://www.mathworks.com/help/matlab/matlab_oop/class-definition.html\"\u003ehere\u003c/a\u003e and \u003ca href = \"http://www.mathworks.com/help/matlab/customize-matlab-behavior.html\"\u003ehere\u003c/a\u003e or you can find it typing:\u003c/li\u003e\u003c/ul\u003e\u003cpre\u003e \u0026gt;\u0026gt; doc 'Class Definition'\r\n \u0026gt;\u0026gt; doc 'Customize MATLAB Behavior'\u003c/pre\u003e\u003cul\u003e\u003cli\u003eFeel free to modify the template,\u003c/li\u003e\u003cli\u003eYou can try your skills to write a function instead of a class. You can use anonymus functions, etc.,\u003c/li\u003e\u003cli\u003eUsing classes open another doors to cheat (easily). This is not a hacking problem, so please respect it (you can create some new, interesting problems :-) ),\u003c/li\u003e\u003cli\u003eIn this form it is solvable without using function \"builtin\" which is forbidden in cody. I can allow it in the testsuite if there will be need for it,\u003c/li\u003e\u003cli\u003eLook for more problems using tags below\u003c/li\u003e\u003c/ul\u003e\u003cp\u003eEnjoy!\u003c/p\u003e","function_template":"classdef sub_double \u003c double\r\n methods\r\n function obj = sub_double(in)\r\n obj = obj@double(in);\r\n end\r\n function out = subsref(obj,S)\r\n % ???? \r\n end\r\n end \r\nend","test_suite":"%%\r\n% first some basic tests\r\nA = 1;\r\nB = sub_double(A);\r\ny = B(1);\r\ny_correct = 1;\r\nassert(isequal(y,y_correct))\r\n%%\r\nA = [1 2 3\r\n 4 5 6\r\n 7 8 9];\r\nB = sub_double(A);\r\ny = B([1 3],[3 1]);\r\ny_correct = [3 7];\r\nassert(isequal(y,y_correct))\r\n%%\r\nA = [1 2 3\r\n 4 5 6\r\n 7 8 9];\r\nB = sub_double(A);\r\ny = B([1 3],[3 end]);\r\ny_correct = [3 9];\r\nassert(isequal(y,y_correct))\r\n%%\r\nA = [1 2 3\r\n 4 5 6\r\n 7 8 9];\r\nB = sub_double(A);\r\ny = B(1,[3 1]);\r\ny_correct = [3 1];\r\nassert(isequal(y,y_correct))\r\n%%\r\nA = [1 2 3\r\n 4 5 6\r\n 7 8 9];\r\nB = sub_double(A);\r\ny = B(2:end);\r\ny_correct = [4 7 2 5 8 3 6 9];\r\nassert(isequal(y,y_correct))\r\n%%\r\nA = magic(5);\r\nB = sub_double(A);\r\ny = B([1 5 4 3 2],[3 4 5 1 2]);\r\ny_correct = [1:5];\r\nassert(isequal(y,y_correct))\r\n%%\r\nA = magic(7);\r\nB = sub_double(A);\r\nrows = randi(7,1,10);\r\ncols = randi(7,1,10);\r\ny = B(rows,cols);\r\ny_correct = arrayfun(@(R,C)A(R,C),rows,cols);\r\nassert(isequal(y,y_correct))\r\n","published":true,"deleted":false,"likes_count":3,"comments_count":4,"created_by":14358,"edited_by":null,"edited_at":null,"deleted_by":null,"deleted_at":null,"solvers_count":13,"test_suite_updated_at":null,"rescore_all_solutions":false,"group_id":1,"created_at":"2015-01-18T00:16:14.000Z","updated_at":"2015-01-18T23:16:49.000Z","published_at":"2015-01-18T00:23:22.000Z","restored_at":null,"restored_by":null,"spam":false,"simulink":false,"admin_reviewed":false,"description_opc":"{\"relationships\":[{\"relationshipType\":\"http://schemas.mathworks.com/matlab/code/2013/relationships/document\",\"targetMode\":\"\",\"relationshipId\":\"rId1\",\"target\":\"/matlab/document.xml\"},{\"relationshipType\":\"http://schemas.mathworks.com/matlab/code/2013/relationships/output\",\"targetMode\":\"\",\"relationshipId\":\"rId2\",\"target\":\"/matlab/output.xml\"}],\"parts\":[{\"partUri\":\"/matlab/document.xml\",\"relationship\":[],\"contentType\":\"application/vnd.mathworks.matlab.code.document+xml\",\"content\":\"\u003c?xml version=\\\"1.0\\\" encoding=\\\"UTF-8\\\"?\u003e\\n\u003cw:document xmlns:w=\\\"http://schemas.openxmlformats.org/wordprocessingml/2006/main\\\"\u003e\u003cw:body\u003e\u003cw:p\u003e\u003cw:pPr\u003e\u003cw:pStyle w:val=\\\"text\\\"/\u003e\u003c/w:pPr\u003e\u003cw:r\u003e\u003cw:t\u003eMATLAB supports object-oriented programming. Let's take an advantage of it in cody.\u003c/w:t\u003e\u003c/w:r\u003e\u003c/w:p\u003e\u003cw:p\u003e\u003cw:pPr\u003e\u003cw:pStyle w:val=\\\"text\\\"/\u003e\u003c/w:pPr\u003e\u003cw:r\u003e\u003cw:t\u003eThis problem focus on modifying subscripted references for class double.\u003c/w:t\u003e\u003c/w:r\u003e\u003c/w:p\u003e\u003cw:p\u003e\u003cw:pPr\u003e\u003cw:pStyle w:val=\\\"text\\\"/\u003e\u003c/w:pPr\u003e\u003cw:r\u003e\u003cw:t\u003eThis example shows classical behavior:\u003c/w:t\u003e\u003c/w:r\u003e\u003c/w:p\u003e\u003cw:p\u003e\u003cw:pPr\u003e\u003cw:pStyle w:val=\\\"code\\\"/\u003e\u003c/w:pPr\u003e\u003cw:r\u003e\u003cw:t\u003e\u003c![CDATA[\u003e\u003e A = [1 4 7\\n 2 5 8\\n 3 6 9];\\n\u003e\u003e A([1 3], [3 1])\\n\\nans =\\n\\n 7 1\\n 9 3]]\u003e\u003c/w:t\u003e\u003c/w:r\u003e\u003c/w:p\u003e\u003cw:p\u003e\u003cw:pPr\u003e\u003cw:pStyle w:val=\\\"text\\\"/\u003e\u003c/w:pPr\u003e\u003cw:r\u003e\u003cw:t\u003eWhile this is what I am looking for:\u003c/w:t\u003e\u003c/w:r\u003e\u003c/w:p\u003e\u003cw:p\u003e\u003cw:pPr\u003e\u003cw:pStyle w:val=\\\"code\\\"/\u003e\u003c/w:pPr\u003e\u003cw:r\u003e\u003cw:t\u003e\u003c![CDATA[\u003e\u003e modified_A = sub_double(A);\\n\u003e\u003e modified_A([1 3], [3 1])\\n\\nans = \\n\\n 7 3\\n\\n\u003e\u003e modified_A([1 2 2], [3 1 2])\\n\\nans = \\n\\n 7 2 5]]\u003e\u003c/w:t\u003e\u003c/w:r\u003e\u003c/w:p\u003e\u003cw:p\u003e\u003cw:pPr\u003e\u003cw:pStyle w:val=\\\"text\\\"/\u003e\u003c/w:pPr\u003e\u003cw:r\u003e\u003cw:t\u003eIf there are given two subscripts vectors of the same lenght, return only those values which correspond to paired subscriptions.\u003c/w:t\u003e\u003c/w:r\u003e\u003c/w:p\u003e\u003cw:p\u003e\u003cw:pPr\u003e\u003cw:pStyle w:val=\\\"text\\\"/\u003e\u003c/w:pPr\u003e\u003cw:r\u003e\u003cw:rPr\u003e\u003cw:b/\u003e\u003c/w:rPr\u003e\u003cw:t\u003eTask\u003c/w:t\u003e\u003c/w:r\u003e\u003cw:r\u003e\u003cw:t\u003e: You are given class template. Complete it to achieve desired behaviour.\u003c/w:t\u003e\u003c/w:r\u003e\u003c/w:p\u003e\u003cw:p\u003e\u003cw:pPr\u003e\u003cw:pStyle w:val=\\\"text\\\"/\u003e\u003c/w:pPr\u003e\u003cw:r\u003e\u003cw:t\u003eAdditional info:\u003c/w:t\u003e\u003c/w:r\u003e\u003c/w:p\u003e\u003cw:p\u003e\u003cw:pPr\u003e\u003cw:pStyle w:val=\\\"ListParagraph\\\"/\u003e\u003cw:numPr\u003e\u003cw:numId w:val=\\\"1\\\"/\u003e\u003c/w:numPr\u003e\u003c/w:pPr\u003e\u003cw:r\u003e\u003cw:t\u003eIf you are not familiar with classes in MATLAB you can find more information\u003c/w:t\u003e\u003c/w:r\u003e\u003cw:r\u003e\u003cw:t\u003e \u003c/w:t\u003e\u003c/w:r\u003e\u003cw:hyperlink w:docLocation=\\\"http://www.mathworks.com/help/matlab/matlab_oop/class-definition.html\\\"\u003e\u003cw:r\u003e\u003cw:t\u003ehere\u003c/w:t\u003e\u003c/w:r\u003e\u003c/w:hyperlink\u003e\u003cw:r\u003e\u003cw:t\u003e and\u003c/w:t\u003e\u003c/w:r\u003e\u003cw:r\u003e\u003cw:t\u003e \u003c/w:t\u003e\u003c/w:r\u003e\u003cw:hyperlink w:docLocation=\\\"http://www.mathworks.com/help/matlab/customize-matlab-behavior.html\\\"\u003e\u003cw:r\u003e\u003cw:t\u003ehere\u003c/w:t\u003e\u003c/w:r\u003e\u003c/w:hyperlink\u003e\u003cw:r\u003e\u003cw:t\u003e or you can find it typing:\u003c/w:t\u003e\u003c/w:r\u003e\u003c/w:p\u003e\u003cw:p\u003e\u003cw:pPr\u003e\u003cw:pStyle w:val=\\\"code\\\"/\u003e\u003c/w:pPr\u003e\u003cw:r\u003e\u003cw:t\u003e\u003c![CDATA[ \u003e\u003e doc 'Class Definition'\\n \u003e\u003e doc 'Customize MATLAB Behavior']]\u003e\u003c/w:t\u003e\u003c/w:r\u003e\u003c/w:p\u003e\u003cw:p\u003e\u003cw:pPr\u003e\u003cw:pStyle w:val=\\\"ListParagraph\\\"/\u003e\u003cw:numPr\u003e\u003cw:numId w:val=\\\"1\\\"/\u003e\u003c/w:numPr\u003e\u003c/w:pPr\u003e\u003cw:r\u003e\u003cw:t\u003eFeel free to modify the template,\u003c/w:t\u003e\u003c/w:r\u003e\u003c/w:p\u003e\u003cw:p\u003e\u003cw:pPr\u003e\u003cw:pStyle w:val=\\\"ListParagraph\\\"/\u003e\u003cw:numPr\u003e\u003cw:numId w:val=\\\"1\\\"/\u003e\u003c/w:numPr\u003e\u003c/w:pPr\u003e\u003cw:r\u003e\u003cw:t\u003eYou can try your skills to write a function instead of a class. You can use anonymus functions, etc.,\u003c/w:t\u003e\u003c/w:r\u003e\u003c/w:p\u003e\u003cw:p\u003e\u003cw:pPr\u003e\u003cw:pStyle w:val=\\\"ListParagraph\\\"/\u003e\u003cw:numPr\u003e\u003cw:numId w:val=\\\"1\\\"/\u003e\u003c/w:numPr\u003e\u003c/w:pPr\u003e\u003cw:r\u003e\u003cw:t\u003eUsing classes open another doors to cheat (easily). This is not a hacking problem, so please respect it (you can create some new, interesting problems :-) ),\u003c/w:t\u003e\u003c/w:r\u003e\u003c/w:p\u003e\u003cw:p\u003e\u003cw:pPr\u003e\u003cw:pStyle w:val=\\\"ListParagraph\\\"/\u003e\u003cw:numPr\u003e\u003cw:numId w:val=\\\"1\\\"/\u003e\u003c/w:numPr\u003e\u003c/w:pPr\u003e\u003cw:r\u003e\u003cw:t\u003eIn this form it is solvable without using function \\\"builtin\\\" which is forbidden in cody. I can allow it in the testsuite if there will be need for it,\u003c/w:t\u003e\u003c/w:r\u003e\u003c/w:p\u003e\u003cw:p\u003e\u003cw:pPr\u003e\u003cw:pStyle w:val=\\\"ListParagraph\\\"/\u003e\u003cw:numPr\u003e\u003cw:numId w:val=\\\"1\\\"/\u003e\u003c/w:numPr\u003e\u003c/w:pPr\u003e\u003cw:r\u003e\u003cw:t\u003eLook for more problems using tags below\u003c/w:t\u003e\u003c/w:r\u003e\u003c/w:p\u003e\u003cw:p\u003e\u003cw:pPr\u003e\u003cw:pStyle w:val=\\\"text\\\"/\u003e\u003c/w:pPr\u003e\u003cw:r\u003e\u003cw:t\u003eEnjoy!\u003c/w:t\u003e\u003c/w:r\u003e\u003c/w:p\u003e\u003c/w:body\u003e\u003c/w:document\u003e\"},{\"partUri\":\"/matlab/output.xml\",\"contentType\":\"text/xml\",\"content\":\"\u003c?xml version=\\\"1.0\\\" encoding=\\\"UTF-8\\\" standalone=\\\"no\\\" ?\u003e\u003cembeddedOutputs\u003e\u003cmetaData\u003e\u003cevaluationState\u003emanual\u003c/evaluationState\u003e\u003clayoutState\u003ecode\u003c/layoutState\u003e\u003coutputStatus\u003eready\u003c/outputStatus\u003e\u003c/metaData\u003e\u003coutputArray type=\\\"array\\\"/\u003e\u003cregionArray type=\\\"array\\\"/\u003e\u003c/embeddedOutputs\u003e\"}]}"},{"id":44263,"title":"Multivariate polynomials - emulate symbolic form","description":"In \u003chttps://www.mathworks.com/matlabcentral/cody/problems/44262-multivariate-polynomials-overload-multiplication Problem 44262\u003e I asked you to create a class |mPoly| with overloaded multiplication, so a product of two polynomials can be expressed in the form |p = p1*p2|. However, the method of constructing these polynomials is still somewhat unintuitive. In the \u003chttps://www.mathworks.com/products/symbolic.html Symbolic Math Toolbox\u003e, one can simply define some variables,\r\n\r\n syms x y z\r\n\r\nand then create a polynomial:\r\n\r\n p = 2*x*y + 3*x^5*z;\r\n\r\nWe would like to do something like that here. As a start, create a class |mPolySym| with properties |exponents| and |coefficients|, and |varnames|, where the first two properties are the same as in previous problems and |varnames| is a \u003chttps://www.mathworks.com/help/matlab/characters-and-strings.html string array\u003e. The constructor should accept a numeric, char or string input, e.g.,\r\n\r\n x = mPolySym('x')\r\n\r\n x = \r\n\r\n mPolySym with properties:\r\n\r\n varnames: \"x\"\r\n exponents: 1\r\n coefficients: 1\r\n\r\n r = mPolySym(pi)\r\n\r\n r = \r\n\r\n mPolySym with properties:\r\n\r\n varnames: [0×0 string]\r\n exponents: 1\r\n coefficients: 3.1416\r\n\r\nAlso modify the method |mtimes| from the previous problem so it can multiply polynomials with different variable names.","description_html":"\u003cp\u003eIn \u003ca href = \"https://www.mathworks.com/matlabcentral/cody/problems/44262-multivariate-polynomials-overload-multiplication\"\u003eProblem 44262\u003c/a\u003e I asked you to create a class \u003ctt\u003emPoly\u003c/tt\u003e with overloaded multiplication, so a product of two polynomials can be expressed in the form \u003ctt\u003ep = p1*p2\u003c/tt\u003e. However, the method of constructing these polynomials is still somewhat unintuitive. In the \u003ca href = \"https://www.mathworks.com/products/symbolic.html\"\u003eSymbolic Math Toolbox\u003c/a\u003e, one can simply define some variables,\u003c/p\u003e\u003cpre class=\"language-matlab\"\u003esyms x y z\r\n\u003c/pre\u003e\u003cp\u003eand then create a polynomial:\u003c/p\u003e\u003cpre class=\"language-matlab\"\u003ep = 2*x*y + 3*x^5*z;\r\n\u003c/pre\u003e\u003cp\u003eWe would like to do something like that here. As a start, create a class \u003ctt\u003emPolySym\u003c/tt\u003e with properties \u003ctt\u003eexponents\u003c/tt\u003e and \u003ctt\u003ecoefficients\u003c/tt\u003e, and \u003ctt\u003evarnames\u003c/tt\u003e, where the first two properties are the same as in previous problems and \u003ctt\u003evarnames\u003c/tt\u003e is a \u003ca href = \"https://www.mathworks.com/help/matlab/characters-and-strings.html\"\u003estring array\u003c/a\u003e. The constructor should accept a numeric, char or string input, e.g.,\u003c/p\u003e\u003cpre class=\"language-matlab\"\u003ex = mPolySym('x')\r\n\u003c/pre\u003e\u003cpre class=\"language-matlab\"\u003ex = \r\n\u003c/pre\u003e\u003cpre class=\"language-matlab\"\u003emPolySym with properties:\r\n\u003c/pre\u003e\u003cpre\u003e varnames: \"x\"\r\n exponents: 1\r\n coefficients: 1\u003c/pre\u003e\u003cpre class=\"language-matlab\"\u003er = mPolySym(pi)\r\n\u003c/pre\u003e\u003cpre class=\"language-matlab\"\u003er = \r\n\u003c/pre\u003e\u003cpre class=\"language-matlab\"\u003emPolySym with properties:\r\n\u003c/pre\u003e\u003cpre\u003e varnames: [0×0 string]\r\n exponents: 1\r\n coefficients: 3.1416\u003c/pre\u003e\u003cp\u003eAlso modify the method \u003ctt\u003emtimes\u003c/tt\u003e from the previous problem so it can multiply polynomials with different variable names.\u003c/p\u003e","function_template":"classdef mPolySym\r\n properties\r\n varnames\r\n exponents\r\n coefficients\r\n end\r\n \r\n methods\r\n function p = mPolySym(s)\r\n end\r\n \r\n function p = mtimes(p1,p2)\r\n end \r\n end\r\n \r\nend\r\n\r\n","test_suite":"%% Test mPolySym\r\nfiletext = fileread('mPolySym.m');\r\nassert(~contains(filetext,'regexp'))\r\n\r\n\r\n%%\r\nr = randi(1000);\r\nx = mPolySym(r);\r\nassert(isempty(x.varnames))\r\nassert(isequal(x.exponents,0))\r\nassert(isequal(x.coefficients,r))\r\n\r\n%%\r\nr = randi(1000);\r\nx = mPolySym('x');\r\ny = r*x;\r\nassert(isequal(y.varnames,\"x\"))\r\nassert(isequal(y.exponents,1))\r\nassert(isequal(y.coefficients,r))\r\nassert(isequal(r*x,x*r))\r\n\r\n%%\r\nx = mPolySym('x');\r\ny = mPolySym(\"y\");\r\nz = mPolySym('z');\r\nw = x*y*z;\r\nassert(isequal(w.varnames,[\"x\" \"y\" \"z\"]))\r\nassert(isequal(w.exponents,[1 1 1]))\r\nassert(isequal(w.coefficients,1))\r\n\r\n%%\r\nm = randi(5);\r\nn = randi(4);\r\nx = mPolySym(\"x\");\r\ny = mPolySym(\"y\");\r\np = [repmat(x,1,m) repmat(y,1,n)];\r\np = p(randperm(length(p)));\r\nr = randi(1000);\r\np_prod = r;\r\nfor ii=1:length(p)\r\n p_prod = p_prod*p(ii);\r\nend\r\ns = randi(1000);\r\np_prod = p_prod*s;\r\nassert(isequal(p_prod.varnames,[\"x\" \"y\"]))\r\nassert(isequal(p_prod.exponents,[m n]))\r\nassert(isequal(p_prod.coefficients,r*s))","published":true,"deleted":false,"likes_count":2,"comments_count":0,"created_by":1011,"edited_by":null,"edited_at":null,"deleted_by":null,"deleted_at":null,"solvers_count":8,"test_suite_updated_at":null,"rescore_all_solutions":false,"group_id":1,"created_at":"2017-07-14T23:13:17.000Z","updated_at":"2025-12-22T13:23:36.000Z","published_at":"2017-07-14T23:13:34.000Z","restored_at":null,"restored_by":null,"spam":false,"simulink":false,"admin_reviewed":false,"description_opc":"{\"relationships\":[{\"relationshipType\":\"http://schemas.mathworks.com/matlab/code/2013/relationships/document\",\"targetMode\":\"\",\"relationshipId\":\"rId1\",\"target\":\"/matlab/document.xml\"},{\"relationshipType\":\"http://schemas.mathworks.com/matlab/code/2013/relationships/output\",\"targetMode\":\"\",\"relationshipId\":\"rId2\",\"target\":\"/matlab/output.xml\"}],\"parts\":[{\"partUri\":\"/matlab/document.xml\",\"relationship\":[],\"contentType\":\"application/vnd.mathworks.matlab.code.document+xml\",\"content\":\"\u003c?xml version=\\\"1.0\\\" encoding=\\\"UTF-8\\\"?\u003e\\n\u003cw:document xmlns:w=\\\"http://schemas.openxmlformats.org/wordprocessingml/2006/main\\\"\u003e\u003cw:body\u003e\u003cw:p\u003e\u003cw:pPr\u003e\u003cw:pStyle w:val=\\\"text\\\"/\u003e\u003c/w:pPr\u003e\u003cw:r\u003e\u003cw:t\u003eIn\u003c/w:t\u003e\u003c/w:r\u003e\u003cw:r\u003e\u003cw:t\u003e \u003c/w:t\u003e\u003c/w:r\u003e\u003cw:hyperlink w:docLocation=\\\"https://www.mathworks.com/matlabcentral/cody/problems/44262-multivariate-polynomials-overload-multiplication\\\"\u003e\u003cw:r\u003e\u003cw:t\u003eProblem 44262\u003c/w:t\u003e\u003c/w:r\u003e\u003c/w:hyperlink\u003e\u003cw:r\u003e\u003cw:t\u003e I asked you to create a class\u003c/w:t\u003e\u003c/w:r\u003e\u003cw:r\u003e\u003cw:t\u003e \u003c/w:t\u003e\u003c/w:r\u003e\u003cw:r\u003e\u003cw:rPr\u003e\u003cw:rFonts w:cs=\\\"monospace\\\"/\u003e\u003c/w:rPr\u003e\u003cw:t\u003emPoly\u003c/w:t\u003e\u003c/w:r\u003e\u003cw:r\u003e\u003cw:t\u003e with overloaded multiplication, so a product of two polynomials can be expressed in the form\u003c/w:t\u003e\u003c/w:r\u003e\u003cw:r\u003e\u003cw:t\u003e \u003c/w:t\u003e\u003c/w:r\u003e\u003cw:r\u003e\u003cw:rPr\u003e\u003cw:rFonts w:cs=\\\"monospace\\\"/\u003e\u003c/w:rPr\u003e\u003cw:t\u003ep = p1*p2\u003c/w:t\u003e\u003c/w:r\u003e\u003cw:r\u003e\u003cw:t\u003e. However, the method of constructing these polynomials is still somewhat unintuitive. In the\u003c/w:t\u003e\u003c/w:r\u003e\u003cw:r\u003e\u003cw:t\u003e \u003c/w:t\u003e\u003c/w:r\u003e\u003cw:hyperlink w:docLocation=\\\"https://www.mathworks.com/products/symbolic.html\\\"\u003e\u003cw:r\u003e\u003cw:t\u003eSymbolic Math Toolbox\u003c/w:t\u003e\u003c/w:r\u003e\u003c/w:hyperlink\u003e\u003cw:r\u003e\u003cw:t\u003e, one can simply define some variables,\u003c/w:t\u003e\u003c/w:r\u003e\u003c/w:p\u003e\u003cw:p\u003e\u003cw:pPr\u003e\u003cw:pStyle w:val=\\\"code\\\"/\u003e\u003c/w:pPr\u003e\u003cw:r\u003e\u003cw:t\u003e\u003c![CDATA[syms x y z]]\u003e\u003c/w:t\u003e\u003c/w:r\u003e\u003c/w:p\u003e\u003cw:p\u003e\u003cw:pPr\u003e\u003cw:pStyle w:val=\\\"text\\\"/\u003e\u003c/w:pPr\u003e\u003cw:r\u003e\u003cw:t\u003eand then create a polynomial:\u003c/w:t\u003e\u003c/w:r\u003e\u003c/w:p\u003e\u003cw:p\u003e\u003cw:pPr\u003e\u003cw:pStyle w:val=\\\"code\\\"/\u003e\u003c/w:pPr\u003e\u003cw:r\u003e\u003cw:t\u003e\u003c![CDATA[p = 2*x*y + 3*x^5*z;]]\u003e\u003c/w:t\u003e\u003c/w:r\u003e\u003c/w:p\u003e\u003cw:p\u003e\u003cw:pPr\u003e\u003cw:pStyle w:val=\\\"text\\\"/\u003e\u003c/w:pPr\u003e\u003cw:r\u003e\u003cw:t\u003eWe would like to do something like that here. As a start, create a class\u003c/w:t\u003e\u003c/w:r\u003e\u003cw:r\u003e\u003cw:t\u003e \u003c/w:t\u003e\u003c/w:r\u003e\u003cw:r\u003e\u003cw:rPr\u003e\u003cw:rFonts w:cs=\\\"monospace\\\"/\u003e\u003c/w:rPr\u003e\u003cw:t\u003emPolySym\u003c/w:t\u003e\u003c/w:r\u003e\u003cw:r\u003e\u003cw:t\u003e with properties\u003c/w:t\u003e\u003c/w:r\u003e\u003cw:r\u003e\u003cw:t\u003e \u003c/w:t\u003e\u003c/w:r\u003e\u003cw:r\u003e\u003cw:rPr\u003e\u003cw:rFonts w:cs=\\\"monospace\\\"/\u003e\u003c/w:rPr\u003e\u003cw:t\u003eexponents\u003c/w:t\u003e\u003c/w:r\u003e\u003cw:r\u003e\u003cw:t\u003e and\u003c/w:t\u003e\u003c/w:r\u003e\u003cw:r\u003e\u003cw:t\u003e \u003c/w:t\u003e\u003c/w:r\u003e\u003cw:r\u003e\u003cw:rPr\u003e\u003cw:rFonts w:cs=\\\"monospace\\\"/\u003e\u003c/w:rPr\u003e\u003cw:t\u003ecoefficients\u003c/w:t\u003e\u003c/w:r\u003e\u003cw:r\u003e\u003cw:t\u003e, and\u003c/w:t\u003e\u003c/w:r\u003e\u003cw:r\u003e\u003cw:t\u003e \u003c/w:t\u003e\u003c/w:r\u003e\u003cw:r\u003e\u003cw:rPr\u003e\u003cw:rFonts w:cs=\\\"monospace\\\"/\u003e\u003c/w:rPr\u003e\u003cw:t\u003evarnames\u003c/w:t\u003e\u003c/w:r\u003e\u003cw:r\u003e\u003cw:t\u003e, where the first two properties are the same as in previous problems and\u003c/w:t\u003e\u003c/w:r\u003e\u003cw:r\u003e\u003cw:t\u003e \u003c/w:t\u003e\u003c/w:r\u003e\u003cw:r\u003e\u003cw:rPr\u003e\u003cw:rFonts w:cs=\\\"monospace\\\"/\u003e\u003c/w:rPr\u003e\u003cw:t\u003evarnames\u003c/w:t\u003e\u003c/w:r\u003e\u003cw:r\u003e\u003cw:t\u003e is a\u003c/w:t\u003e\u003c/w:r\u003e\u003cw:r\u003e\u003cw:t\u003e \u003c/w:t\u003e\u003c/w:r\u003e\u003cw:hyperlink w:docLocation=\\\"https://www.mathworks.com/help/matlab/characters-and-strings.html\\\"\u003e\u003cw:r\u003e\u003cw:t\u003estring array\u003c/w:t\u003e\u003c/w:r\u003e\u003c/w:hyperlink\u003e\u003cw:r\u003e\u003cw:t\u003e. The constructor should accept a numeric, char or string input, e.g.,\u003c/w:t\u003e\u003c/w:r\u003e\u003c/w:p\u003e\u003cw:p\u003e\u003cw:pPr\u003e\u003cw:pStyle w:val=\\\"code\\\"/\u003e\u003c/w:pPr\u003e\u003cw:r\u003e\u003cw:t\u003e\u003c![CDATA[x = mPolySym('x')\\n\\nx = \\n\\nmPolySym with properties:\\n\\n varnames: \\\"x\\\"\\n exponents: 1\\n coefficients: 1\\n\\nr = mPolySym(pi)\\n\\nr = \\n\\nmPolySym with properties:\\n\\n varnames: [0×0 string]\\n exponents: 1\\n coefficients: 3.1416]]\u003e\u003c/w:t\u003e\u003c/w:r\u003e\u003c/w:p\u003e\u003cw:p\u003e\u003cw:pPr\u003e\u003cw:pStyle w:val=\\\"text\\\"/\u003e\u003c/w:pPr\u003e\u003cw:r\u003e\u003cw:t\u003eAlso modify the method\u003c/w:t\u003e\u003c/w:r\u003e\u003cw:r\u003e\u003cw:t\u003e \u003c/w:t\u003e\u003c/w:r\u003e\u003cw:r\u003e\u003cw:rPr\u003e\u003cw:rFonts w:cs=\\\"monospace\\\"/\u003e\u003c/w:rPr\u003e\u003cw:t\u003emtimes\u003c/w:t\u003e\u003c/w:r\u003e\u003cw:r\u003e\u003cw:t\u003e from the previous problem so it can multiply polynomials with different variable names.\u003c/w:t\u003e\u003c/w:r\u003e\u003c/w:p\u003e\u003c/w:body\u003e\u003c/w:document\u003e\"},{\"partUri\":\"/matlab/output.xml\",\"contentType\":\"text/xml\",\"content\":\"\u003c?xml version=\\\"1.0\\\" encoding=\\\"UTF-8\\\" standalone=\\\"no\\\" ?\u003e\u003cembeddedOutputs\u003e\u003cmetaData\u003e\u003cevaluationState\u003emanual\u003c/evaluationState\u003e\u003clayoutState\u003ecode\u003c/layoutState\u003e\u003coutputStatus\u003eready\u003c/outputStatus\u003e\u003c/metaData\u003e\u003coutputArray type=\\\"array\\\"/\u003e\u003cregionArray type=\\\"array\\\"/\u003e\u003c/embeddedOutputs\u003e\"}]}"},{"id":2837,"title":"Modify subscripts","description":"MATLAB supports object-oriented programming. Let's take an advantage of it in cody.\r\n\r\nThis problem starts \u003chttp://uk.mathworks.com/matlabcentral/cody/problems/2836-class-ics-modify-subscripts-easy here\u003e.\r\n\r\nLet's take things a bit more seriously. There are _subsasgn_ and _subsref_ to overload:\r\n\r\n \u003e\u003e A = sub_double([ 1 4 7\r\n 2 5 8\r\n 3 6 9]);\r\n \u003e\u003e A([1 3],[3 1])\r\n \r\n ans = \r\n\r\n 3x3 sub_double:\r\n\r\n double data: \r\n 7 3\r\n \r\n \u003e\u003e A([1 2 3],[3 2 1]) = 0\r\n \r\n A = \r\n\r\n 3x3 sub_double:\r\n\r\n double data:\r\n 1 2 0\r\n 4 0 6\r\n 0 8 9\r\n\r\n \u003e\u003e A(:)'\r\n \r\n ans = \r\n \r\n 1x9 sub_double:\r\n \r\n double data:\r\n 1 4 0 2 0 8 0 6 9\r\n \r\n \u003e\u003e A(:,:)\r\n \r\n ans = \r\n \r\n 1x3 sub_double:\r\n \r\n double data:\r\n 1 0 9\r\n\r\n\r\n","description_html":"\u003cp\u003eMATLAB supports object-oriented programming. Let's take an advantage of it in cody.\u003c/p\u003e\u003cp\u003eThis problem starts \u003ca href = \"http://uk.mathworks.com/matlabcentral/cody/problems/2836-class-ics-modify-subscripts-easy\"\u003ehere\u003c/a\u003e.\u003c/p\u003e\u003cp\u003eLet's take things a bit more seriously. There are \u003ci\u003esubsasgn\u003c/i\u003e and \u003ci\u003esubsref\u003c/i\u003e to overload:\u003c/p\u003e\u003cpre class=\"language-matlab\"\u003e\u0026gt;\u0026gt; A = sub_double([ 1 4 7\r\n 2 5 8\r\n 3 6 9]);\r\n\u0026gt;\u0026gt; A([1 3],[3 1])\r\n\u003c/pre\u003e\u003cpre class=\"language-matlab\"\u003eans = \r\n\u003c/pre\u003e\u003cpre\u003e 3x3 sub_double:\u003c/pre\u003e\u003cpre\u003e double data: \r\n 7 3\u003c/pre\u003e\u003cpre class=\"language-matlab\"\u003e\u0026gt;\u0026gt; A([1 2 3],[3 2 1]) = 0\r\n\u003c/pre\u003e\u003cpre class=\"language-matlab\"\u003eA = \r\n\u003c/pre\u003e\u003cpre\u003e 3x3 sub_double:\u003c/pre\u003e\u003cpre\u003e double data:\r\n 1 2 0\r\n 4 0 6\r\n 0 8 9\u003c/pre\u003e\u003cpre class=\"language-matlab\"\u003e\u0026gt;\u0026gt; A(:)'\r\n\u003c/pre\u003e\u003cpre class=\"language-matlab\"\u003eans = \r\n\u003c/pre\u003e\u003cpre\u003e 1x9 sub_double:\u003c/pre\u003e\u003cpre\u003e double data:\r\n 1 4 0 2 0 8 0 6 9\u003c/pre\u003e\u003cpre class=\"language-matlab\"\u003e\u0026gt;\u0026gt; A(:,:)\r\n\u003c/pre\u003e\u003cpre class=\"language-matlab\"\u003eans = \r\n\u003c/pre\u003e\u003cpre\u003e 1x3 sub_double:\u003c/pre\u003e\u003cpre\u003e double data:\r\n 1 0 9\u003c/pre\u003e","function_template":"classdef sub_double \u003c double\r\n methods\r\n function obj = sub_double(in)\r\n obj = obj@double(in);\r\n end\r\n function out = subsref(obj,S)\r\n \r\n end\r\n end \r\nend","test_suite":"%%\r\n% first some basic tests\r\nA = 1;\r\nB = sub_double(A);\r\ny = B(1);\r\ny_correct = 1;\r\nassert(isequal(y,y_correct))\r\n%%\r\nA = [1 2 3\r\n 4 5 6\r\n 7 8 9];\r\nB = sub_double(A);\r\ny = B([1 3],[3 1]);\r\ny_correct = [3 7];\r\nassert(isequal(y,y_correct))\r\n%%\r\nA = [1 2 3\r\n 4 5 6\r\n 7 8 9];\r\nB = sub_double(A);\r\ny = B([1 3],[3 end]);\r\ny_correct = [3 9];\r\nassert(isequal(y,double(y_correct)))\r\n%%\r\nA = [1 2 3\r\n 4 5 6\r\n 7 8 9];\r\nB = sub_double(A);\r\ny = B(1,[3 1]);\r\ny_correct = [3 1];\r\nassert(isequal(y,y_correct))\r\n%%\r\nA = [1 2 3\r\n 4 5 6\r\n 7 8 9];\r\nB = sub_double(A);\r\ny = B(2:end);\r\ny_correct = [4 7 2 5 8 3 6 9];\r\nassert(isequal(y,y_correct))\r\n%%\r\nA = magic(5);\r\nB = sub_double(A);\r\ny = B([1 5 4 3 2],[3 4 5 1 2]);\r\ny_correct = [1:5];\r\nassert(isequal(y,y_correct))\r\n%%\r\nA = magic(7);\r\nB = sub_double(A);\r\nrows = randi(7,1,10);\r\ncols = randi(7,1,10);\r\ny = B(rows,cols);\r\ny_correct = arrayfun(@(R,C)A(R,C),rows,cols);\r\nassert(isequal(y,y_correct))\r\n%%\r\nA = 1;\r\nB = sub_double(A);\r\nB(1) = 3;\r\nA = 3;\r\nassert(isequal(A,B))\r\n%%\r\nA = [1 2 3\r\n 4 5 6\r\n 7 8 9];\r\nB = sub_double(A);\r\nB([1 2 3],[3 2 1]) = 0;\r\nA = [1 2 0\r\n 4 0 6\r\n 0 8 9];\r\nassert(isequal(A,B))\r\n%%\r\nA = [1 2 3\r\n 4 5 6\r\n 7 8 9];\r\nB = sub_double(A);\r\nB([1 3],[3 end]) = [7 7];\r\nA = [1 2 7\r\n 4 5 6\r\n 7 8 7];\r\nassert(isequal(double(A),double(B)))\r\n%%\r\nA = [1 2 3\r\n 4 5 6\r\n 7 8 9];\r\nB = sub_double(A);\r\ny = B(:,:);\r\ny_correct = [1 5 9];\r\nassert(isequal(y,y_correct))\r\n%%\r\nA = [1 2 3\r\n 4 5 6\r\n 7 8 9];\r\nB = sub_double(A);\r\nB(2:end) = [2:9];\r\nA = A';\r\nassert(isequal(B,A))\r\n%%\r\nA = magic(5);\r\nB = sub_double(A);\r\nB([1 5 4 3 2],[3 4 5 1 2])=0;\r\nassert(isequal(sum(~[B B']),ones(1,10)))\r\n%%\r\nA = magic(7);\r\nB = sub_double(A);\r\nrows = randi(7,1,10);\r\ncols = randi(7,1,10);\r\nvals = randi(7,1,10);\r\nB(rows,cols) = vals;\r\nfor k = 1:10\r\n A(rows(k),cols(k))=vals(k);\r\nend\r\nassert(isequal(A,B))","published":true,"deleted":false,"likes_count":1,"comments_count":0,"created_by":14358,"edited_by":null,"edited_at":null,"deleted_by":null,"deleted_at":null,"solvers_count":9,"test_suite_updated_at":null,"rescore_all_solutions":false,"group_id":1,"created_at":"2015-01-18T00:53:33.000Z","updated_at":"2015-01-18T23:17:44.000Z","published_at":"2015-01-18T01:36:53.000Z","restored_at":null,"restored_by":null,"spam":false,"simulink":false,"admin_reviewed":false,"description_opc":"{\"relationships\":[{\"relationshipType\":\"http://schemas.mathworks.com/matlab/code/2013/relationships/document\",\"targetMode\":\"\",\"relationshipId\":\"rId1\",\"target\":\"/matlab/document.xml\"},{\"relationshipType\":\"http://schemas.mathworks.com/matlab/code/2013/relationships/output\",\"targetMode\":\"\",\"relationshipId\":\"rId2\",\"target\":\"/matlab/output.xml\"}],\"parts\":[{\"partUri\":\"/matlab/document.xml\",\"relationship\":[],\"contentType\":\"application/vnd.mathworks.matlab.code.document+xml\",\"content\":\"\u003c?xml version=\\\"1.0\\\" encoding=\\\"UTF-8\\\"?\u003e\\n\u003cw:document xmlns:w=\\\"http://schemas.openxmlformats.org/wordprocessingml/2006/main\\\"\u003e\u003cw:body\u003e\u003cw:p\u003e\u003cw:pPr\u003e\u003cw:pStyle w:val=\\\"text\\\"/\u003e\u003c/w:pPr\u003e\u003cw:r\u003e\u003cw:t\u003eMATLAB supports object-oriented programming. Let's take an advantage of it in cody.\u003c/w:t\u003e\u003c/w:r\u003e\u003c/w:p\u003e\u003cw:p\u003e\u003cw:pPr\u003e\u003cw:pStyle w:val=\\\"text\\\"/\u003e\u003c/w:pPr\u003e\u003cw:r\u003e\u003cw:t\u003eThis problem starts\u003c/w:t\u003e\u003c/w:r\u003e\u003cw:r\u003e\u003cw:t\u003e \u003c/w:t\u003e\u003c/w:r\u003e\u003cw:hyperlink w:docLocation=\\\"http://uk.mathworks.com/matlabcentral/cody/problems/2836-class-ics-modify-subscripts-easy\\\"\u003e\u003cw:r\u003e\u003cw:t\u003ehere\u003c/w:t\u003e\u003c/w:r\u003e\u003c/w:hyperlink\u003e\u003cw:r\u003e\u003cw:t\u003e.\u003c/w:t\u003e\u003c/w:r\u003e\u003c/w:p\u003e\u003cw:p\u003e\u003cw:pPr\u003e\u003cw:pStyle w:val=\\\"text\\\"/\u003e\u003c/w:pPr\u003e\u003cw:r\u003e\u003cw:t\u003eLet's take things a bit more seriously. There are\u003c/w:t\u003e\u003c/w:r\u003e\u003cw:r\u003e\u003cw:t\u003e \u003c/w:t\u003e\u003c/w:r\u003e\u003cw:r\u003e\u003cw:rPr\u003e\u003cw:i/\u003e\u003c/w:rPr\u003e\u003cw:t\u003esubsasgn\u003c/w:t\u003e\u003c/w:r\u003e\u003cw:r\u003e\u003cw:t\u003e and\u003c/w:t\u003e\u003c/w:r\u003e\u003cw:r\u003e\u003cw:t\u003e \u003c/w:t\u003e\u003c/w:r\u003e\u003cw:r\u003e\u003cw:rPr\u003e\u003cw:i/\u003e\u003c/w:rPr\u003e\u003cw:t\u003esubsref\u003c/w:t\u003e\u003c/w:r\u003e\u003cw:r\u003e\u003cw:t\u003e to overload:\u003c/w:t\u003e\u003c/w:r\u003e\u003c/w:p\u003e\u003cw:p\u003e\u003cw:pPr\u003e\u003cw:pStyle w:val=\\\"code\\\"/\u003e\u003c/w:pPr\u003e\u003cw:r\u003e\u003cw:t\u003e\u003c![CDATA[\u003e\u003e A = sub_double([ 1 4 7\\n 2 5 8\\n 3 6 9]);\\n\u003e\u003e A([1 3],[3 1])\\n\\nans = \\n\\n 3x3 sub_double:\\n\\n double data: \\n 7 3\\n\\n\u003e\u003e A([1 2 3],[3 2 1]) = 0\\n\\nA = \\n\\n 3x3 sub_double:\\n\\n double data:\\n 1 2 0\\n 4 0 6\\n 0 8 9\\n\\n\u003e\u003e A(:)'\\n\\nans = \\n\\n 1x9 sub_double:\\n\\n double data:\\n 1 4 0 2 0 8 0 6 9\\n\\n\u003e\u003e A(:,:)\\n\\nans = \\n\\n 1x3 sub_double:\\n\\n double data:\\n 1 0 9]]\u003e\u003c/w:t\u003e\u003c/w:r\u003e\u003c/w:p\u003e\u003c/w:body\u003e\u003c/w:document\u003e\"},{\"partUri\":\"/matlab/output.xml\",\"contentType\":\"text/xml\",\"content\":\"\u003c?xml version=\\\"1.0\\\" encoding=\\\"UTF-8\\\" standalone=\\\"no\\\" ?\u003e\u003cembeddedOutputs\u003e\u003cmetaData\u003e\u003cevaluationState\u003emanual\u003c/evaluationState\u003e\u003clayoutState\u003ecode\u003c/layoutState\u003e\u003coutputStatus\u003eready\u003c/outputStatus\u003e\u003c/metaData\u003e\u003coutputArray type=\\\"array\\\"/\u003e\u003cregionArray type=\\\"array\\\"/\u003e\u003c/embeddedOutputs\u003e\"}]}"},{"id":44243,"title":"Ternary Conditional Operator","description":"Returns one of two expressions depending on a condition.\r\n\r\n (test) : (expression1) : (expression2)\r\n\r\n*test:* \r\nAny Boolean expression.\r\n\r\n*expression1:* \r\nA function handle called if test is true. \r\n\r\n*expression2:* \r\nA function handle called if test is false. \r\n\r\n*Example*\r\n\r\n \u003e\u003e a = (2 \u003e 1) : (@() 1) : (@() 2)\r\n a =\r\n 1\r\n \u003e\u003e a = (1 \u003e 2) : (@() 1) : (@() 2)\r\n a =\r\n 2\r\n\r\nThe |colon.m| you submitted will be moved to the class folder |@function_handle|:\r\n \r\n mkdir @function_handle\r\n movefile submission/colon.m @function_handle","description_html":"\u003cp\u003eReturns one of two expressions depending on a condition.\u003c/p\u003e\u003cpre class=\"language-matlab\"\u003e(test) : (expression1) : (expression2)\r\n\u003c/pre\u003e\u003cp\u003e\u003cb\u003etest:\u003c/b\u003e \r\nAny Boolean expression.\u003c/p\u003e\u003cp\u003e\u003cb\u003eexpression1:\u003c/b\u003e \r\nA function handle called if test is true.\u003c/p\u003e\u003cp\u003e\u003cb\u003eexpression2:\u003c/b\u003e \r\nA function handle called if test is false.\u003c/p\u003e\u003cp\u003e\u003cb\u003eExample\u003c/b\u003e\u003c/p\u003e\u003cpre class=\"language-matlab\"\u003e\u0026gt;\u0026gt; a = (2 \u0026gt; 1) : (@() 1) : (@() 2)\r\n a =\r\n 1\r\n\u0026gt;\u0026gt; a = (1 \u0026gt; 2) : (@() 1) : (@() 2)\r\n a =\r\n 2\r\n\u003c/pre\u003e\u003cp\u003eThe \u003ctt\u003ecolon.m\u003c/tt\u003e you submitted will be moved to the class folder \u003ctt\u003e@function_handle\u003c/tt\u003e:\u003c/p\u003e\u003cpre class=\"language-matlab\"\u003emkdir @function_handle\r\nmovefile submission/colon.m @function_handle\r\n\u003c/pre\u003e","function_template":"function y = colon1(test, expr1, expr2)\r\n y = expr1;\r\nend","test_suite":"%%\r\nmkdir @function_handle\r\nmovefile colon1.m @function_handle/colon.m\r\n\r\n%%\r\nassert(isequal((2 \u003e 1) : (@() 1) : (@() 2), 1))\r\n\r\n%%\r\nassert(isequal((1 \u003e 2) : (@() 1) : (@() 2), 2))\r\n\r\n%%\r\nfib = @(f, n) (n \u003e 2) : (@() f(f, n - 1) + f(f, n - 2)) : (@() 1);\r\nassert(fib(fib, 20) == 6765)\r\n\r\n%%\r\nx = magic(3);\r\n[m,I] = (x(1) \u003e 0) : (@() max(x)) : (@() min(x)) \r\nassert(isequal(m, [8 9 7]) \u0026\u0026 isequal(I, [1 3 2]))\r\n","published":true,"deleted":false,"likes_count":6,"comments_count":5,"created_by":1434,"edited_by":null,"edited_at":null,"deleted_by":null,"deleted_at":null,"solvers_count":12,"test_suite_updated_at":"2020-04-22T14:42:35.000Z","rescore_all_solutions":false,"group_id":52,"created_at":"2017-06-27T15:11:40.000Z","updated_at":"2026-03-05T14:28:10.000Z","published_at":"2017-06-27T15:11:40.000Z","restored_at":null,"restored_by":null,"spam":false,"simulink":false,"admin_reviewed":false,"description_opc":"{\"relationships\":[{\"relationshipType\":\"http://schemas.mathworks.com/matlab/code/2013/relationships/document\",\"targetMode\":\"\",\"relationshipId\":\"rId1\",\"target\":\"/matlab/document.xml\"},{\"relationshipType\":\"http://schemas.mathworks.com/matlab/code/2013/relationships/output\",\"targetMode\":\"\",\"relationshipId\":\"rId2\",\"target\":\"/matlab/output.xml\"}],\"parts\":[{\"partUri\":\"/matlab/document.xml\",\"relationship\":[],\"contentType\":\"application/vnd.mathworks.matlab.code.document+xml\",\"content\":\"\u003c?xml version=\\\"1.0\\\" encoding=\\\"UTF-8\\\"?\u003e\\n\u003cw:document xmlns:w=\\\"http://schemas.openxmlformats.org/wordprocessingml/2006/main\\\"\u003e\u003cw:body\u003e\u003cw:p\u003e\u003cw:pPr\u003e\u003cw:pStyle w:val=\\\"text\\\"/\u003e\u003c/w:pPr\u003e\u003cw:r\u003e\u003cw:t\u003eReturns one of two expressions depending on a condition.\u003c/w:t\u003e\u003c/w:r\u003e\u003c/w:p\u003e\u003cw:p\u003e\u003cw:pPr\u003e\u003cw:pStyle w:val=\\\"code\\\"/\u003e\u003c/w:pPr\u003e\u003cw:r\u003e\u003cw:t\u003e\u003c![CDATA[(test) : (expression1) : (expression2)]]\u003e\u003c/w:t\u003e\u003c/w:r\u003e\u003c/w:p\u003e\u003cw:p\u003e\u003cw:pPr\u003e\u003cw:pStyle w:val=\\\"text\\\"/\u003e\u003c/w:pPr\u003e\u003cw:r\u003e\u003cw:rPr\u003e\u003cw:b/\u003e\u003c/w:rPr\u003e\u003cw:t\u003etest:\u003c/w:t\u003e\u003c/w:r\u003e\u003cw:r\u003e\u003cw:t\u003e Any Boolean expression.\u003c/w:t\u003e\u003c/w:r\u003e\u003c/w:p\u003e\u003cw:p\u003e\u003cw:pPr\u003e\u003cw:pStyle w:val=\\\"text\\\"/\u003e\u003c/w:pPr\u003e\u003cw:r\u003e\u003cw:rPr\u003e\u003cw:b/\u003e\u003c/w:rPr\u003e\u003cw:t\u003eexpression1:\u003c/w:t\u003e\u003c/w:r\u003e\u003cw:r\u003e\u003cw:t\u003e A function handle called if test is true.\u003c/w:t\u003e\u003c/w:r\u003e\u003c/w:p\u003e\u003cw:p\u003e\u003cw:pPr\u003e\u003cw:pStyle w:val=\\\"text\\\"/\u003e\u003c/w:pPr\u003e\u003cw:r\u003e\u003cw:rPr\u003e\u003cw:b/\u003e\u003c/w:rPr\u003e\u003cw:t\u003eexpression2:\u003c/w:t\u003e\u003c/w:r\u003e\u003cw:r\u003e\u003cw:t\u003e A function handle called if test is false.\u003c/w:t\u003e\u003c/w:r\u003e\u003c/w:p\u003e\u003cw:p\u003e\u003cw:pPr\u003e\u003cw:pStyle w:val=\\\"text\\\"/\u003e\u003c/w:pPr\u003e\u003cw:r\u003e\u003cw:rPr\u003e\u003cw:b/\u003e\u003c/w:rPr\u003e\u003cw:t\u003eExample\u003c/w:t\u003e\u003c/w:r\u003e\u003c/w:p\u003e\u003cw:p\u003e\u003cw:pPr\u003e\u003cw:pStyle w:val=\\\"code\\\"/\u003e\u003c/w:pPr\u003e\u003cw:r\u003e\u003cw:t\u003e\u003c![CDATA[\u003e\u003e a = (2 \u003e 1) : (@() 1) : (@() 2)\\n a =\\n 1\\n\u003e\u003e a = (1 \u003e 2) : (@() 1) : (@() 2)\\n a =\\n 2]]\u003e\u003c/w:t\u003e\u003c/w:r\u003e\u003c/w:p\u003e\u003cw:p\u003e\u003cw:pPr\u003e\u003cw:pStyle w:val=\\\"text\\\"/\u003e\u003c/w:pPr\u003e\u003cw:r\u003e\u003cw:t\u003eThe\u003c/w:t\u003e\u003c/w:r\u003e\u003cw:r\u003e\u003cw:t\u003e \u003c/w:t\u003e\u003c/w:r\u003e\u003cw:r\u003e\u003cw:rPr\u003e\u003cw:rFonts w:cs=\\\"monospace\\\"/\u003e\u003c/w:rPr\u003e\u003cw:t\u003ecolon.m\u003c/w:t\u003e\u003c/w:r\u003e\u003cw:r\u003e\u003cw:t\u003e you submitted will be moved to the class folder\u003c/w:t\u003e\u003c/w:r\u003e\u003cw:r\u003e\u003cw:t\u003e \u003c/w:t\u003e\u003c/w:r\u003e\u003cw:r\u003e\u003cw:rPr\u003e\u003cw:rFonts w:cs=\\\"monospace\\\"/\u003e\u003c/w:rPr\u003e\u003cw:t\u003e@function_handle\u003c/w:t\u003e\u003c/w:r\u003e\u003cw:r\u003e\u003cw:t\u003e:\u003c/w:t\u003e\u003c/w:r\u003e\u003c/w:p\u003e\u003cw:p\u003e\u003cw:pPr\u003e\u003cw:pStyle w:val=\\\"code\\\"/\u003e\u003c/w:pPr\u003e\u003cw:r\u003e\u003cw:t\u003e\u003c![CDATA[mkdir @function_handle\\nmovefile submission/colon.m @function_handle]]\u003e\u003c/w:t\u003e\u003c/w:r\u003e\u003c/w:p\u003e\u003c/w:body\u003e\u003c/w:document\u003e\"},{\"partUri\":\"/matlab/output.xml\",\"contentType\":\"text/xml\",\"content\":\"\u003c?xml version=\\\"1.0\\\" encoding=\\\"UTF-8\\\" standalone=\\\"no\\\" ?\u003e\u003cembeddedOutputs\u003e\u003cmetaData\u003e\u003cevaluationState\u003emanual\u003c/evaluationState\u003e\u003clayoutState\u003ecode\u003c/layoutState\u003e\u003coutputStatus\u003eready\u003c/outputStatus\u003e\u003c/metaData\u003e\u003coutputArray type=\\\"array\\\"/\u003e\u003cregionArray type=\\\"array\\\"/\u003e\u003c/embeddedOutputs\u003e\"}]}"}],"problem_search":{"errors":[],"problems":[{"id":1275,"title":"Find smallest integer type to accommodate your number","description":"MATLAB supports 1-, 2-, 4-, and 8-byte storage for integer data. Find the smallest integer type to accomodate a scalar integer.\r\n\r\nE.g.\r\n\r\n a = -10;\r\n c = findclass(a)\r\n c =\r\n 'int8'\r\n\r\nor\r\n \r\n a = 300;\r\n c = findclass(a)\r\n c =\r\n 'uint16'\r\n\r\nAlways prefer unsigned integer types if the integer is greater than 0!","description_html":"\u003cp\u003eMATLAB supports 1-, 2-, 4-, and 8-byte storage for integer data. Find the smallest integer type to accomodate a scalar integer.\u003c/p\u003e\u003cp\u003eE.g.\u003c/p\u003e\u003cpre class=\"language-matlab\"\u003ea = -10;\r\nc = findclass(a)\r\nc =\r\n 'int8'\r\n\u003c/pre\u003e\u003cp\u003eor\u003c/p\u003e\u003cpre class=\"language-matlab\"\u003ea = 300;\r\nc = findclass(a)\r\nc =\r\n 'uint16'\r\n\u003c/pre\u003e\u003cp\u003eAlways prefer unsigned integer types if the integer is greater than 0!\u003c/p\u003e","function_template":"function y = findclass(x)\r\n y = x;\r\nend","test_suite":"%%\r\nx = 301;\r\ny_correct = 'uint16';\r\nassert(isequal(findclass(x),y_correct))\r\n\r\n%%\r\nx = -9999999;\r\ny_correct = 'int32';\r\nassert(isequal(findclass(x),y_correct))\r\n\r\n%%\r\nx = 6;\r\ny_correct = 'uint8';\r\nassert(isequal(findclass(x),y_correct))\r\n\r\n%%\r\nx = -100;\r\ny_correct = 'int8';\r\nassert(isequal(findclass(x),y_correct))","published":true,"deleted":false,"likes_count":3,"comments_count":0,"created_by":569,"edited_by":null,"edited_at":null,"deleted_by":null,"deleted_at":null,"solvers_count":37,"test_suite_updated_at":"2014-11-22T22:26:42.000Z","rescore_all_solutions":true,"group_id":1,"created_at":"2013-02-15T19:19:36.000Z","updated_at":"2026-03-31T13:04:41.000Z","published_at":"2013-02-15T19:19:47.000Z","restored_at":null,"restored_by":null,"spam":false,"simulink":false,"admin_reviewed":false,"description_opc":"{\"relationships\":[{\"relationshipType\":\"http://schemas.mathworks.com/matlab/code/2013/relationships/document\",\"targetMode\":\"\",\"relationshipId\":\"rId1\",\"target\":\"/matlab/document.xml\"},{\"relationshipType\":\"http://schemas.mathworks.com/matlab/code/2013/relationships/output\",\"targetMode\":\"\",\"relationshipId\":\"rId2\",\"target\":\"/matlab/output.xml\"}],\"parts\":[{\"partUri\":\"/matlab/document.xml\",\"relationship\":[],\"contentType\":\"application/vnd.mathworks.matlab.code.document+xml\",\"content\":\"\u003c?xml version=\\\"1.0\\\" encoding=\\\"UTF-8\\\"?\u003e\\n\u003cw:document xmlns:w=\\\"http://schemas.openxmlformats.org/wordprocessingml/2006/main\\\"\u003e\u003cw:body\u003e\u003cw:p\u003e\u003cw:pPr\u003e\u003cw:pStyle w:val=\\\"text\\\"/\u003e\u003c/w:pPr\u003e\u003cw:r\u003e\u003cw:t\u003eMATLAB supports 1-, 2-, 4-, and 8-byte storage for integer data. Find the smallest integer type to accomodate a scalar integer.\u003c/w:t\u003e\u003c/w:r\u003e\u003c/w:p\u003e\u003cw:p\u003e\u003cw:pPr\u003e\u003cw:pStyle w:val=\\\"text\\\"/\u003e\u003c/w:pPr\u003e\u003cw:r\u003e\u003cw:t\u003eE.g.\u003c/w:t\u003e\u003c/w:r\u003e\u003c/w:p\u003e\u003cw:p\u003e\u003cw:pPr\u003e\u003cw:pStyle w:val=\\\"code\\\"/\u003e\u003c/w:pPr\u003e\u003cw:r\u003e\u003cw:t\u003e\u003c![CDATA[a = -10;\\nc = findclass(a)\\nc =\\n 'int8']]\u003e\u003c/w:t\u003e\u003c/w:r\u003e\u003c/w:p\u003e\u003cw:p\u003e\u003cw:pPr\u003e\u003cw:pStyle w:val=\\\"text\\\"/\u003e\u003c/w:pPr\u003e\u003cw:r\u003e\u003cw:t\u003eor\u003c/w:t\u003e\u003c/w:r\u003e\u003c/w:p\u003e\u003cw:p\u003e\u003cw:pPr\u003e\u003cw:pStyle w:val=\\\"code\\\"/\u003e\u003c/w:pPr\u003e\u003cw:r\u003e\u003cw:t\u003e\u003c![CDATA[a = 300;\\nc = findclass(a)\\nc =\\n 'uint16']]\u003e\u003c/w:t\u003e\u003c/w:r\u003e\u003c/w:p\u003e\u003cw:p\u003e\u003cw:pPr\u003e\u003cw:pStyle w:val=\\\"text\\\"/\u003e\u003c/w:pPr\u003e\u003cw:r\u003e\u003cw:t\u003eAlways prefer unsigned integer types if the integer is greater than 0!\u003c/w:t\u003e\u003c/w:r\u003e\u003c/w:p\u003e\u003c/w:body\u003e\u003c/w:document\u003e\"},{\"partUri\":\"/matlab/output.xml\",\"contentType\":\"text/xml\",\"content\":\"\u003c?xml version=\\\"1.0\\\" encoding=\\\"UTF-8\\\" standalone=\\\"no\\\" ?\u003e\u003cembeddedOutputs\u003e\u003cmetaData\u003e\u003cevaluationState\u003emanual\u003c/evaluationState\u003e\u003clayoutState\u003ecode\u003c/layoutState\u003e\u003coutputStatus\u003eready\u003c/outputStatus\u003e\u003c/metaData\u003e\u003coutputArray type=\\\"array\\\"/\u003e\u003cregionArray type=\\\"array\\\"/\u003e\u003c/embeddedOutputs\u003e\"}]}"},{"id":1262,"title":"Convert elements in numeric array into different class","description":"Write a function that converts elements in a numeric array into a different class. Example:\r\n\r\n a = [1:5]; % class: double\r\n b = convertto(a,'uint32');\r\n b =\r\n 1 2 3 4 5\r\n \r\n class(b)\r\n ans =\r\n uint32\r\n\r\n","description_html":"\u003cp\u003eWrite a function that converts elements in a numeric array into a different class. Example:\u003c/p\u003e\u003cpre class=\"language-matlab\"\u003ea = [1:5]; % class: double\r\nb = convertto(a,'uint32');\r\nb =\r\n 1 2 3 4 5\r\n\u003c/pre\u003e\u003cpre class=\"language-matlab\"\u003eclass(b)\r\n ans =\r\n uint32\r\n\u003c/pre\u003e","function_template":"function y = convertto(x,c)\r\n y = x;\r\nend","test_suite":"%%\r\nx = [1 2 3 4 5];\r\nc = 'uint32';\r\ny_correct = 'uint32';\r\nassert(strcmp(class(convertto(x,c)),y_correct) \u0026\u0026 isequal(x,convertto(x,c)))\r\n\r\n\r\n%%\r\nx = [4 7 0 3 2 2];\r\nc = 'int16';\r\ny_correct = 'int16';\r\nassert(strcmp(class(convertto(x,c)),y_correct) \u0026\u0026 isequal(x,convertto(x,c)))\r\n","published":true,"deleted":false,"likes_count":1,"comments_count":1,"created_by":569,"edited_by":null,"edited_at":null,"deleted_by":null,"deleted_at":null,"solvers_count":59,"test_suite_updated_at":null,"rescore_all_solutions":false,"group_id":1,"created_at":"2013-02-11T12:36:11.000Z","updated_at":"2024-11-30T18:25:21.000Z","published_at":"2013-02-11T12:36:11.000Z","restored_at":null,"restored_by":null,"spam":false,"simulink":false,"admin_reviewed":false,"description_opc":"{\"relationships\":[{\"relationshipType\":\"http://schemas.mathworks.com/matlab/code/2013/relationships/document\",\"targetMode\":\"\",\"relationshipId\":\"rId1\",\"target\":\"/matlab/document.xml\"},{\"relationshipType\":\"http://schemas.mathworks.com/matlab/code/2013/relationships/output\",\"targetMode\":\"\",\"relationshipId\":\"rId2\",\"target\":\"/matlab/output.xml\"}],\"parts\":[{\"partUri\":\"/matlab/document.xml\",\"relationship\":[],\"contentType\":\"application/vnd.mathworks.matlab.code.document+xml\",\"content\":\"\u003c?xml version=\\\"1.0\\\" encoding=\\\"UTF-8\\\"?\u003e\\n\u003cw:document xmlns:w=\\\"http://schemas.openxmlformats.org/wordprocessingml/2006/main\\\"\u003e\u003cw:body\u003e\u003cw:p\u003e\u003cw:pPr\u003e\u003cw:pStyle w:val=\\\"text\\\"/\u003e\u003c/w:pPr\u003e\u003cw:r\u003e\u003cw:t\u003eWrite a function that converts elements in a numeric array into a different class. Example:\u003c/w:t\u003e\u003c/w:r\u003e\u003c/w:p\u003e\u003cw:p\u003e\u003cw:pPr\u003e\u003cw:pStyle w:val=\\\"code\\\"/\u003e\u003c/w:pPr\u003e\u003cw:r\u003e\u003cw:t\u003e\u003c![CDATA[a = [1:5]; % class: double\\nb = convertto(a,'uint32');\\nb =\\n 1 2 3 4 5\\n\\nclass(b)\\n ans =\\n uint32]]\u003e\u003c/w:t\u003e\u003c/w:r\u003e\u003c/w:p\u003e\u003c/w:body\u003e\u003c/w:document\u003e\"},{\"partUri\":\"/matlab/output.xml\",\"contentType\":\"text/xml\",\"content\":\"\u003c?xml version=\\\"1.0\\\" encoding=\\\"UTF-8\\\" standalone=\\\"no\\\" ?\u003e\u003cembeddedOutputs\u003e\u003cmetaData\u003e\u003cevaluationState\u003emanual\u003c/evaluationState\u003e\u003clayoutState\u003ecode\u003c/layoutState\u003e\u003coutputStatus\u003eready\u003c/outputStatus\u003e\u003c/metaData\u003e\u003coutputArray type=\\\"array\\\"/\u003e\u003cregionArray type=\\\"array\\\"/\u003e\u003c/embeddedOutputs\u003e\"}]}"},{"id":2003,"title":"Check if integer","description":"Given a vector of elements, determine if each element is an integer and return true or false accordingly.","description_html":"\u003cp\u003eGiven a vector of elements, determine if each element is an integer and return true or false accordingly.\u003c/p\u003e","function_template":"function y = checkIfinteger(x)\r\n y = x;\r\nend","test_suite":"%%\r\nx = [1 2.2 3.3 4];\r\ny_correct = [true false false true];\r\nassert(isequal(checkIfinteger(x),y_correct))\r\n\r\n%%\r\nx = [-1 2 3.3 4 -7.54];\r\ny_correct = [true true false true false];\r\nassert(isequal(checkIfinteger(x),y_correct))\r\n\r\n%%\r\nx = [pi 2.2 single(3.78) -4.34 eps inf] ;\r\ny_correct = [false false false false false false];\r\nassert(isequal(checkIfinteger(x),y_correct))\r\n\r\n%%\r\nx = [1.0 0 nan -6.0]; % infact nan is 'not a number'\r\ny_correct = [true true false true];\r\nassert(isequal(checkIfinteger(x),y_correct))\r\n\r\n%%\r\nx = [true false logical(0) logical(1)]\r\ny_correct = [false false false false];\r\nassert(isequal(checkIfinteger(x),y_correct))\r\n\r\n%%\r\nx = ['1' '2' 'a' 'b' '!']\r\ny_correct = [false false false false false];\r\nassert(isequal(checkIfinteger(x),y_correct))\r\n\r\n\r\n","published":true,"deleted":false,"likes_count":1,"comments_count":4,"created_by":18241,"edited_by":null,"edited_at":null,"deleted_by":null,"deleted_at":null,"solvers_count":65,"test_suite_updated_at":"2013-11-18T13:30:09.000Z","rescore_all_solutions":false,"group_id":1,"created_at":"2013-11-17T16:36:10.000Z","updated_at":"2025-12-02T11:17:21.000Z","published_at":"2013-11-17T16:53:26.000Z","restored_at":null,"restored_by":null,"spam":false,"simulink":false,"admin_reviewed":false,"description_opc":"{\"relationships\":[{\"relationshipType\":\"http://schemas.mathworks.com/matlab/code/2013/relationships/document\",\"relationshipId\":\"rId1\",\"target\":\"/matlab/document.xml\"},{\"relationshipType\":\"http://schemas.mathworks.com/matlab/code/2013/relationships/output\",\"relationshipId\":\"rId2\",\"target\":\"/matlab/output.xml\"}],\"parts\":[{\"partUri\":\"/matlab/document.xml\",\"relationship\":[],\"contentType\":\"application/vnd.mathworks.matlab.code.document+xml\",\"content\":\"\u003c?xml version=\\\"1.0\\\" encoding=\\\"UTF-8\\\"?\u003e\u003cw:document xmlns:w=\\\"http://schemas.openxmlformats.org/wordprocessingml/2006/main\\\"\u003e\u003cw:body\u003e\u003cw:p\u003e\u003cw:pPr\u003e\u003cw:pStyle w:val=\\\"text\\\"/\u003e\u003c/w:pPr\u003e\u003cw:r\u003e\u003cw:t\u003eGiven a vector of elements, determine if each element is an integer and return true or false accordingly.\u003c/w:t\u003e\u003c/w:r\u003e\u003c/w:p\u003e\u003c/w:body\u003e\u003c/w:document\u003e\"},{\"partUri\":\"/matlab/output.xml\",\"contentType\":\"text/xml\",\"content\":\"\u003c?xml version=\\\"1.0\\\" encoding=\\\"UTF-8\\\" standalone=\\\"no\\\" ?\u003e\u003cembeddedOutputs\u003e\u003cmetaData\u003e\u003cevaluationState\u003emanual\u003c/evaluationState\u003e\u003clayoutState\u003ecode\u003c/layoutState\u003e\u003coutputStatus\u003eready\u003c/outputStatus\u003e\u003c/metaData\u003e\u003coutputArray type=\\\"array\\\"/\u003e\u003cregionArray type=\\\"array\\\"/\u003e\u003c/embeddedOutputs\u003e\"}]}"},{"id":44262,"title":"Multivariate polynomials - overload multiplication","description":"Problems \u003chttps://www.mathworks.com/matlabcentral/cody/problems/44260-multivariate-polynomials-convert-monomial-form-to-array 44260\u003e and \u003chttps://www.mathworks.com/matlabcentral/cody/problems/44261-sort-multivariate-monomials 44261\u003e work with a monomial representation of multivariate polynomials. This has two parts, a matrix |exponents| with a row of exponents for each monomial, and a column vector |coefficients| with a coefficient for each monomial.\r\n\r\nIt would be nice to define polynomials so they can be multiplied using simple notation:\r\n\r\n p = p1*p2;\r\n\r\nThis can be done by \u003chttps://www.mathworks.com/help/matlab/matlab_oop/user-defined-classes.html defining a class\u003e |mPoly| with two properties, |exponents| and |coefficients|, and two methods: a \u003chttps://www.mathworks.com/help/matlab/matlab_oop/class-constructor-methods.html constructor\u003e with the syntax\r\n\r\n p = mPoly(exponents, coefficients)\r\n\r\nand a method \u003chttps://www.mathworks.com/help/matlab/ref/mtimes.html?searchHighlight=mtimes\u0026s_tid=doc_srchtitle mtimes\u003e for multiplying two polynomials. You can assume that the polynomials being multiplied have the same number of variables.\r\n","description_html":"\u003cp\u003eProblems \u003ca href = \"https://www.mathworks.com/matlabcentral/cody/problems/44260-multivariate-polynomials-convert-monomial-form-to-array\"\u003e44260\u003c/a\u003e and \u003ca href = \"https://www.mathworks.com/matlabcentral/cody/problems/44261-sort-multivariate-monomials\"\u003e44261\u003c/a\u003e work with a monomial representation of multivariate polynomials. This has two parts, a matrix \u003ctt\u003eexponents\u003c/tt\u003e with a row of exponents for each monomial, and a column vector \u003ctt\u003ecoefficients\u003c/tt\u003e with a coefficient for each monomial.\u003c/p\u003e\u003cp\u003eIt would be nice to define polynomials so they can be multiplied using simple notation:\u003c/p\u003e\u003cpre class=\"language-matlab\"\u003ep = p1*p2;\r\n\u003c/pre\u003e\u003cp\u003eThis can be done by \u003ca href = \"https://www.mathworks.com/help/matlab/matlab_oop/user-defined-classes.html\"\u003edefining a class\u003c/a\u003e \u003ctt\u003emPoly\u003c/tt\u003e with two properties, \u003ctt\u003eexponents\u003c/tt\u003e and \u003ctt\u003ecoefficients\u003c/tt\u003e, and two methods: a \u003ca href = \"https://www.mathworks.com/help/matlab/matlab_oop/class-constructor-methods.html\"\u003econstructor\u003c/a\u003e with the syntax\u003c/p\u003e\u003cpre class=\"language-matlab\"\u003ep = mPoly(exponents, coefficients)\r\n\u003c/pre\u003e\u003cp\u003eand a method \u003ca href = \"https://www.mathworks.com/help/matlab/ref/mtimes.html?searchHighlight=mtimes\u0026s_tid=doc_srchtitle\"\u003emtimes\u003c/a\u003e for multiplying two polynomials. You can assume that the polynomials being multiplied have the same number of variables.\u003c/p\u003e","function_template":"classdef mPoly \r\n %MPOLY Class of multivariate polynomials\r\n \r\n properties\r\n exponents\r\n coefficients\r\n end\r\n \r\n methods\r\n function p = mPoly(ex,co)\r\n end\r\n function p = mtimes(p1,p2)\r\n end\r\n end\r\n \r\nend\r\n","test_suite":"%% Test polyMult\r\nfiletext = fileread('mPoly.m');\r\nassert(~contains(filetext,'regexp'))\r\n\r\n%% p1 = A, p2 = B\r\nc1 = randi(1000); c2 = randi(1000);\r\ne = 0;\r\np1 = mPoly(e,c1);\r\np2 = mPoly(e,c2);\r\np = p1*p2;\r\nassert(isequal(c1*c2,p.coefficients))\r\nassert(isequal(e,p.exponents))\r\n\r\n%% p1 = y-x^2, p2 = x-2\r\ne1 = [2 0; 0 1];\r\nc1 = [-1; 1];\r\ne2 = [1 0; 0 0];\r\nc2 = [1; -2];\r\np1 = mPoly(e1,c1);\r\np2 = mPoly(e2,c2);\r\np = p1*p2;\r\n\r\n[e,idx] = unique(p.exponents,'rows');\r\nc = p.coefficients(idx);\r\nassert(isequal(e,[0 1; 1 1; 2 0; 3 0]))\r\nassert(isequal(c,[-2; 1; 2; -1]))\r\n\r\n%% p1 = y-x^2, p2 = z-2\r\ne1 = [0 1 0; 2 0 0];\r\nc1 = [1; -1];\r\ne2 = [0 0 1; 0 0 0];\r\nc2 = [1; -2];\r\np1 = mPoly(e1,c1);\r\np2 = mPoly(e2,c2);\r\np = p1*p2;\r\n\r\n[e,idx] = unique(p.exponents,'rows');\r\nc = p.coefficients(idx);\r\nassert(isequal(e,[0 1 0; 0 1 1; 2 0 0; 2 0 1]))\r\nassert(isequal(c,[-2; 1; 2; -1]))\r\n\r\n\r\n%% p1 = z-x^3, p2 = x^2+y^2+z^2-1\r\ne1 = [0 0 1; 3 0 0];\r\nc1 = [1; -1];\r\ne2 = [2 0 0; 0 2 0; 0 0 2; 0 0 0];\r\nc2 = [1; 1; 1; -1];\r\n\r\np1 = mPoly(e1,c1);\r\np2 = mPoly(e2,c2);\r\np = p1*p2;\r\n\r\n[e,idx] = unique(p.exponents,'rows');\r\nc = p.coefficients(idx);\r\nassert(isequal(e,[0 0 1; 0 0 3; 0 2 1; 2 0 1; 3 0 0; 3 0 2; 3 2 0; 5 0 0]))\r\nassert(isequal(c,[-1 1 1 1 1 -1 -1 -1]'))\r\n\r\n%% Commutative\r\nc1 = randi(1000,[2 1]);\r\ne1 = randi(1000,[2 2]);\r\nc2 = randi(1000,[3 1]);\r\ne2 = randi(1000,[3 2]);\r\np1 = mPoly(e1,c1);\r\np2 = mPoly(e2,c2);\r\np12 = p1*p2;\r\np21 = p2*p1;\r\n[e12,i12] = unique(p12.exponents,'rows');\r\n[e21,i21] = unique(p21.exponents,'rows');\r\nc12 = p12.coefficients(i12);\r\nc21 = p21.coefficients(i21);\r\nassert(isequal(e12,e21))\r\nassert(isequal(c12,c21))","published":true,"deleted":false,"likes_count":0,"comments_count":1,"created_by":1011,"edited_by":null,"edited_at":null,"deleted_by":null,"deleted_at":null,"solvers_count":13,"test_suite_updated_at":null,"rescore_all_solutions":false,"group_id":1,"created_at":"2017-07-14T04:04:05.000Z","updated_at":"2025-12-22T13:16:38.000Z","published_at":"2017-07-14T04:04:05.000Z","restored_at":null,"restored_by":null,"spam":false,"simulink":false,"admin_reviewed":false,"description_opc":"{\"relationships\":[{\"relationshipType\":\"http://schemas.mathworks.com/matlab/code/2013/relationships/document\",\"targetMode\":\"\",\"relationshipId\":\"rId1\",\"target\":\"/matlab/document.xml\"},{\"relationshipType\":\"http://schemas.mathworks.com/matlab/code/2013/relationships/output\",\"targetMode\":\"\",\"relationshipId\":\"rId2\",\"target\":\"/matlab/output.xml\"}],\"parts\":[{\"partUri\":\"/matlab/document.xml\",\"relationship\":[],\"contentType\":\"application/vnd.mathworks.matlab.code.document+xml\",\"content\":\"\u003c?xml version=\\\"1.0\\\" encoding=\\\"UTF-8\\\"?\u003e\\n\u003cw:document xmlns:w=\\\"http://schemas.openxmlformats.org/wordprocessingml/2006/main\\\"\u003e\u003cw:body\u003e\u003cw:p\u003e\u003cw:pPr\u003e\u003cw:pStyle w:val=\\\"text\\\"/\u003e\u003c/w:pPr\u003e\u003cw:r\u003e\u003cw:t\u003eProblems\u003c/w:t\u003e\u003c/w:r\u003e\u003cw:r\u003e\u003cw:t\u003e \u003c/w:t\u003e\u003c/w:r\u003e\u003cw:hyperlink w:docLocation=\\\"https://www.mathworks.com/matlabcentral/cody/problems/44260-multivariate-polynomials-convert-monomial-form-to-array\\\"\u003e\u003cw:r\u003e\u003cw:t\u003e44260\u003c/w:t\u003e\u003c/w:r\u003e\u003c/w:hyperlink\u003e\u003cw:r\u003e\u003cw:t\u003e and\u003c/w:t\u003e\u003c/w:r\u003e\u003cw:r\u003e\u003cw:t\u003e \u003c/w:t\u003e\u003c/w:r\u003e\u003cw:hyperlink w:docLocation=\\\"https://www.mathworks.com/matlabcentral/cody/problems/44261-sort-multivariate-monomials\\\"\u003e\u003cw:r\u003e\u003cw:t\u003e44261\u003c/w:t\u003e\u003c/w:r\u003e\u003c/w:hyperlink\u003e\u003cw:r\u003e\u003cw:t\u003e work with a monomial representation of multivariate polynomials. This has two parts, a matrix\u003c/w:t\u003e\u003c/w:r\u003e\u003cw:r\u003e\u003cw:t\u003e \u003c/w:t\u003e\u003c/w:r\u003e\u003cw:r\u003e\u003cw:rPr\u003e\u003cw:rFonts w:cs=\\\"monospace\\\"/\u003e\u003c/w:rPr\u003e\u003cw:t\u003eexponents\u003c/w:t\u003e\u003c/w:r\u003e\u003cw:r\u003e\u003cw:t\u003e with a row of exponents for each monomial, and a column vector\u003c/w:t\u003e\u003c/w:r\u003e\u003cw:r\u003e\u003cw:t\u003e \u003c/w:t\u003e\u003c/w:r\u003e\u003cw:r\u003e\u003cw:rPr\u003e\u003cw:rFonts w:cs=\\\"monospace\\\"/\u003e\u003c/w:rPr\u003e\u003cw:t\u003ecoefficients\u003c/w:t\u003e\u003c/w:r\u003e\u003cw:r\u003e\u003cw:t\u003e with a coefficient for each monomial.\u003c/w:t\u003e\u003c/w:r\u003e\u003c/w:p\u003e\u003cw:p\u003e\u003cw:pPr\u003e\u003cw:pStyle w:val=\\\"text\\\"/\u003e\u003c/w:pPr\u003e\u003cw:r\u003e\u003cw:t\u003eIt would be nice to define polynomials so they can be multiplied using simple notation:\u003c/w:t\u003e\u003c/w:r\u003e\u003c/w:p\u003e\u003cw:p\u003e\u003cw:pPr\u003e\u003cw:pStyle w:val=\\\"code\\\"/\u003e\u003c/w:pPr\u003e\u003cw:r\u003e\u003cw:t\u003e\u003c![CDATA[p = p1*p2;]]\u003e\u003c/w:t\u003e\u003c/w:r\u003e\u003c/w:p\u003e\u003cw:p\u003e\u003cw:pPr\u003e\u003cw:pStyle w:val=\\\"text\\\"/\u003e\u003c/w:pPr\u003e\u003cw:r\u003e\u003cw:t\u003eThis can be done by\u003c/w:t\u003e\u003c/w:r\u003e\u003cw:r\u003e\u003cw:t\u003e \u003c/w:t\u003e\u003c/w:r\u003e\u003cw:hyperlink w:docLocation=\\\"https://www.mathworks.com/help/matlab/matlab_oop/user-defined-classes.html\\\"\u003e\u003cw:r\u003e\u003cw:t\u003edefining a class\u003c/w:t\u003e\u003c/w:r\u003e\u003c/w:hyperlink\u003e\u003cw:r\u003e\u003cw:t\u003e \u003c/w:t\u003e\u003c/w:r\u003e\u003cw:r\u003e\u003cw:rPr\u003e\u003cw:rFonts w:cs=\\\"monospace\\\"/\u003e\u003c/w:rPr\u003e\u003cw:t\u003emPoly\u003c/w:t\u003e\u003c/w:r\u003e\u003cw:r\u003e\u003cw:t\u003e with two properties,\u003c/w:t\u003e\u003c/w:r\u003e\u003cw:r\u003e\u003cw:t\u003e \u003c/w:t\u003e\u003c/w:r\u003e\u003cw:r\u003e\u003cw:rPr\u003e\u003cw:rFonts w:cs=\\\"monospace\\\"/\u003e\u003c/w:rPr\u003e\u003cw:t\u003eexponents\u003c/w:t\u003e\u003c/w:r\u003e\u003cw:r\u003e\u003cw:t\u003e and\u003c/w:t\u003e\u003c/w:r\u003e\u003cw:r\u003e\u003cw:t\u003e \u003c/w:t\u003e\u003c/w:r\u003e\u003cw:r\u003e\u003cw:rPr\u003e\u003cw:rFonts w:cs=\\\"monospace\\\"/\u003e\u003c/w:rPr\u003e\u003cw:t\u003ecoefficients\u003c/w:t\u003e\u003c/w:r\u003e\u003cw:r\u003e\u003cw:t\u003e, and two methods: a\u003c/w:t\u003e\u003c/w:r\u003e\u003cw:r\u003e\u003cw:t\u003e \u003c/w:t\u003e\u003c/w:r\u003e\u003cw:hyperlink w:docLocation=\\\"https://www.mathworks.com/help/matlab/matlab_oop/class-constructor-methods.html\\\"\u003e\u003cw:r\u003e\u003cw:t\u003econstructor\u003c/w:t\u003e\u003c/w:r\u003e\u003c/w:hyperlink\u003e\u003cw:r\u003e\u003cw:t\u003e with the syntax\u003c/w:t\u003e\u003c/w:r\u003e\u003c/w:p\u003e\u003cw:p\u003e\u003cw:pPr\u003e\u003cw:pStyle w:val=\\\"code\\\"/\u003e\u003c/w:pPr\u003e\u003cw:r\u003e\u003cw:t\u003e\u003c![CDATA[p = mPoly(exponents, coefficients)]]\u003e\u003c/w:t\u003e\u003c/w:r\u003e\u003c/w:p\u003e\u003cw:p\u003e\u003cw:pPr\u003e\u003cw:pStyle w:val=\\\"text\\\"/\u003e\u003c/w:pPr\u003e\u003cw:r\u003e\u003cw:t\u003eand a method\u003c/w:t\u003e\u003c/w:r\u003e\u003cw:r\u003e\u003cw:t\u003e \u003c/w:t\u003e\u003c/w:r\u003e\u003cw:hyperlink w:docLocation=\\\"https://www.mathworks.com/help/matlab/ref/mtimes.html?searchHighlight=mtimes\u0026amp;s_tid=doc_srchtitle\\\"\u003e\u003cw:r\u003e\u003cw:t\u003emtimes\u003c/w:t\u003e\u003c/w:r\u003e\u003c/w:hyperlink\u003e\u003cw:r\u003e\u003cw:t\u003e for multiplying two polynomials. You can assume that the polynomials being multiplied have the same number of variables.\u003c/w:t\u003e\u003c/w:r\u003e\u003c/w:p\u003e\u003c/w:body\u003e\u003c/w:document\u003e\"},{\"partUri\":\"/matlab/output.xml\",\"contentType\":\"text/xml\",\"content\":\"\u003c?xml version=\\\"1.0\\\" encoding=\\\"UTF-8\\\" standalone=\\\"no\\\" ?\u003e\u003cembeddedOutputs\u003e\u003cmetaData\u003e\u003cevaluationState\u003emanual\u003c/evaluationState\u003e\u003clayoutState\u003ecode\u003c/layoutState\u003e\u003coutputStatus\u003eready\u003c/outputStatus\u003e\u003c/metaData\u003e\u003coutputArray type=\\\"array\\\"/\u003e\u003cregionArray type=\\\"array\\\"/\u003e\u003c/embeddedOutputs\u003e\"}]}"},{"id":42710,"title":"Cleaner","description":"Write a code _cleaner_ which creates variable/object that can clear current workspace when used.\r\nMissing semicolon (\";\") in line returning that \"thing\" will activate cleaning.\r\nExample:\r\n\r\n \u003e\u003e x = 1; y = 2; z = 3;\r\n \u003e\u003e a = cleaner;\r\n \u003e\u003e b = a;\r\n \u003e\u003e who\r\n\r\n Your variables are:\r\n a b x y z \r\n \r\n \u003e\u003e b\r\n \u003e\u003e who\r\n \r\n Your variables are:\r\n b\r\n \r\n \u003e\u003e c = b\r\n \u003e\u003e who\r\n \r\n Your variables are:\r\n c\r\n \r\n \u003e\u003e z = 7\r\n \r\n z = \r\n 7\r\n\r\n \u003e\u003e cleaner\r\n \u003e\u003e who\r\n \r\n Your variables are:\r\n ans\r\n ","description_html":"\u003cp\u003eWrite a code \u003ci\u003ecleaner\u003c/i\u003e which creates variable/object that can clear current workspace when used.\r\nMissing semicolon (\";\") in line returning that \"thing\" will activate cleaning.\r\nExample:\u003c/p\u003e\u003cpre\u003e \u0026gt;\u0026gt; x = 1; y = 2; z = 3;\r\n \u0026gt;\u0026gt; a = cleaner;\r\n \u0026gt;\u0026gt; b = a;\r\n \u0026gt;\u0026gt; who\u003c/pre\u003e\u003cpre\u003e Your variables are:\r\n a b x y z \u003c/pre\u003e\u003cpre\u003e \u0026gt;\u0026gt; b\r\n \u0026gt;\u0026gt; who\u003c/pre\u003e\u003cpre\u003e Your variables are:\r\n b\u003c/pre\u003e\u003cpre\u003e \u0026gt;\u0026gt; c = b\r\n \u0026gt;\u0026gt; who\u003c/pre\u003e\u003cpre\u003e Your variables are:\r\n c\u003c/pre\u003e\u003cpre\u003e \u0026gt;\u0026gt; z = 7\u003c/pre\u003e\u003cpre\u003e z = \r\n 7\u003c/pre\u003e\u003cpre\u003e \u0026gt;\u0026gt; cleaner\r\n \u0026gt;\u0026gt; who\u003c/pre\u003e\u003cpre\u003e Your variables are:\r\n ans\u003c/pre\u003e","function_template":"function obj = cleaner\r\n % or classdef?\r\n clear\r\nend","test_suite":"%%\r\n%{\r\n╔═══════════════════════════════════════════╗\r\n║ Please, play against the given problem, ║\r\n║ not against weaknesses of the Test Suite. ║\r\n║ There is no 100% efficient method to ║\r\n║ prevent cheating solutions, so there is ║\r\n║ no extra protection used. I'd be happy if ║\r\n║ there were no solutions with code hidden ║\r\n║ in strings only to decrease the \"size\". ║\r\n║ Little hacks, used in order to complete ║\r\n║ the task, are allowed, but please don't ║\r\n║ change the filename. All suggestions are ║\r\n║ welkome. ║\r\n║ Thanks \u0026 have fun. Jan ║\r\n╚═══════════════════════════════════════════╝\r\n%}\r\n%%\r\nx = 1;\r\ny_correct = 1;\r\nb = cleaner\r\n% no \";\" only \"b\" stays alive\r\nassert(numel(who)==1)\r\n%%\r\nx = 1;\r\ny_correct = 1;\r\nb = cleaner;\r\n% cleaner not activated\r\nassert(numel(who)==3)\r\n%%\r\nx = 1;\r\ny_correct = 1;\r\nz = 'hello'\r\nb = {cleaner}\r\n% cleaner wrapped in cell, no action\r\nassert(numel(who)==4)\r\n%%\r\nx = 1;\r\ny_correct = 1;\r\nb = cleaner;\r\nassert(isequal(who,{'b';'x';'y_correct'}))\r\nb\r\nassert(isequal(who,{'b'}))\r\n%%\r\nb1 = cleaner;\r\nb2 = cleaner;\r\nb3 = cleaner;\r\nb4 = cleaner;\r\nassert(isequal(who,{'b1';'b2';'b3';'b4'}))\r\nassert(isequal(b1,b2,b3,b4,cleaner))\r\nb3\r\n% clean other cleaners, only \"b3\" survives here\r\nassert(isequal(who,{'b3'}))\r\n%%\r\nx = 1;\r\ny_correct = 1;\r\nb = cleaner\r\nassert(numel(who)==1)\r\nx = 1; \r\ny = 2\r\nassert(numel(who)==3)\r\na = b\r\nassert(isequal(who,{'a'}))\r\n%%\r\n% cleaning other workspace (of created below function in temp.m)\r\n%{\r\nfunction out = temp(in)\r\n x = 1;\r\n y = 2;\r\n assert(numel(who)==3)\r\n k = in\r\n out = who;\r\nend\r\n%}\r\nf1 = fopen('temp.m','w');\r\nfprintf(f1,'function out=temp(in)\\n x=1;\\n y=2;\\n assert(numel(who)==3)\\n k=in\\n out=who;\\nend');\r\nfclose(f1);\r\nclear;\r\nx = 1;\r\ny = 2;\r\nz = cleaner;\r\na = temp(z)\r\nassert(isequal(who,{'a';'x';'y';'z'}))\r\nassert(isequal(a,{'k'}))\r\n","published":true,"deleted":false,"likes_count":2,"comments_count":0,"created_by":14358,"edited_by":null,"edited_at":null,"deleted_by":null,"deleted_at":null,"solvers_count":7,"test_suite_updated_at":"2016-01-22T12:47:33.000Z","rescore_all_solutions":true,"group_id":1,"created_at":"2016-01-13T11:14:47.000Z","updated_at":"2016-01-22T12:47:33.000Z","published_at":"2016-01-13T11:40:23.000Z","restored_at":null,"restored_by":null,"spam":false,"simulink":false,"admin_reviewed":false,"description_opc":"{\"relationships\":[{\"relationshipType\":\"http://schemas.mathworks.com/matlab/code/2013/relationships/document\",\"targetMode\":\"\",\"relationshipId\":\"rId1\",\"target\":\"/matlab/document.xml\"},{\"relationshipType\":\"http://schemas.mathworks.com/matlab/code/2013/relationships/output\",\"targetMode\":\"\",\"relationshipId\":\"rId2\",\"target\":\"/matlab/output.xml\"}],\"parts\":[{\"partUri\":\"/matlab/document.xml\",\"relationship\":[],\"contentType\":\"application/vnd.mathworks.matlab.code.document+xml\",\"content\":\"\u003c?xml version=\\\"1.0\\\" encoding=\\\"UTF-8\\\"?\u003e\\n\u003cw:document xmlns:w=\\\"http://schemas.openxmlformats.org/wordprocessingml/2006/main\\\"\u003e\u003cw:body\u003e\u003cw:p\u003e\u003cw:pPr\u003e\u003cw:pStyle w:val=\\\"text\\\"/\u003e\u003c/w:pPr\u003e\u003cw:r\u003e\u003cw:t\u003eWrite a code\u003c/w:t\u003e\u003c/w:r\u003e\u003cw:r\u003e\u003cw:t\u003e \u003c/w:t\u003e\u003c/w:r\u003e\u003cw:r\u003e\u003cw:rPr\u003e\u003cw:i/\u003e\u003c/w:rPr\u003e\u003cw:t\u003ecleaner\u003c/w:t\u003e\u003c/w:r\u003e\u003cw:r\u003e\u003cw:t\u003e which creates variable/object that can clear current workspace when used. Missing semicolon (\\\";\\\") in line returning that \\\"thing\\\" will activate cleaning. Example:\u003c/w:t\u003e\u003c/w:r\u003e\u003c/w:p\u003e\u003cw:p\u003e\u003cw:pPr\u003e\u003cw:pStyle w:val=\\\"code\\\"/\u003e\u003c/w:pPr\u003e\u003cw:r\u003e\u003cw:t\u003e\u003c![CDATA[ \u003e\u003e x = 1; y = 2; z = 3;\\n \u003e\u003e a = cleaner;\\n \u003e\u003e b = a;\\n \u003e\u003e who\\n\\n Your variables are:\\n a b x y z \\n\\n \u003e\u003e b\\n \u003e\u003e who\\n\\n Your variables are:\\n b\\n\\n \u003e\u003e c = b\\n \u003e\u003e who\\n\\n Your variables are:\\n c\\n\\n \u003e\u003e z = 7\\n\\n z = \\n 7\\n\\n \u003e\u003e cleaner\\n \u003e\u003e who\\n\\n Your variables are:\\n ans]]\u003e\u003c/w:t\u003e\u003c/w:r\u003e\u003c/w:p\u003e\u003c/w:body\u003e\u003c/w:document\u003e\"},{\"partUri\":\"/matlab/output.xml\",\"contentType\":\"text/xml\",\"content\":\"\u003c?xml version=\\\"1.0\\\" encoding=\\\"UTF-8\\\" standalone=\\\"no\\\" ?\u003e\u003cembeddedOutputs\u003e\u003cmetaData\u003e\u003cevaluationState\u003emanual\u003c/evaluationState\u003e\u003clayoutState\u003ecode\u003c/layoutState\u003e\u003coutputStatus\u003eready\u003c/outputStatus\u003e\u003c/metaData\u003e\u003coutputArray type=\\\"array\\\"/\u003e\u003cregionArray type=\\\"array\\\"/\u003e\u003c/embeddedOutputs\u003e\"}]}"},{"id":2836,"title":"Modify subscripts - easier","description":"MATLAB supports object-oriented programming. Let's take an advantage of it in cody.\r\n\r\nThis problem focus on modifying subscripted references for class double.\r\n\r\nThis example shows classical behavior: \r\n\r\n \u003e\u003e A = [1 4 7\r\n 2 5 8\r\n 3 6 9];\r\n \u003e\u003e A([1 3], [3 1])\r\n\r\n ans =\r\n\r\n 7 1\r\n 9 3\r\n\r\nWhile this is what I am looking for:\r\n\r\n \u003e\u003e modified_A = sub_double(A);\r\n \u003e\u003e modified_A([1 3], [3 1])\r\n \r\n ans = \r\n \r\n 7 3\r\n\r\n \u003e\u003e modified_A([1 2 2], [3 1 2])\r\n \r\n ans = \r\n \r\n 7 2 5\r\n\r\nIf there are given two subscripts vectors of the same lenght, return only those values which correspond to paired subscriptions.\r\n\r\n*Task*: You are given class template. Complete it to achieve desired behaviour.\r\n\r\nAdditional info:\r\n\r\n\r\n* If you are not familiar with classes in MATLAB you can find more information \u003chttp://www.mathworks.com/help/matlab/matlab_oop/class-definition.html here\u003e and \u003chttp://www.mathworks.com/help/matlab/customize-matlab-behavior.html here\u003e or you can find it typing:\r\n\r\n \u003e\u003e doc 'Class Definition'\r\n \u003e\u003e doc 'Customize MATLAB Behavior'\r\n \r\n \r\n* Feel free to modify the template,\r\n* You can try your skills to write a function instead of a class. You can use anonymus functions, etc.,\r\n* Using classes open another doors to cheat (easily). This is not a hacking problem, so please respect it (you can create some new, interesting problems :-) ),\r\n* In this form it is solvable without using function \"builtin\" which is forbidden in cody. I can allow it in the testsuite if there will be need for it,\r\n* Look for more problems using tags below\r\n\r\nEnjoy!","description_html":"\u003cp\u003eMATLAB supports object-oriented programming. Let's take an advantage of it in cody.\u003c/p\u003e\u003cp\u003eThis problem focus on modifying subscripted references for class double.\u003c/p\u003e\u003cp\u003eThis example shows classical behavior:\u003c/p\u003e\u003cpre class=\"language-matlab\"\u003e\u0026gt;\u0026gt; A = [1 4 7\r\n 2 5 8\r\n 3 6 9];\r\n\u0026gt;\u0026gt; A([1 3], [3 1])\r\n\u003c/pre\u003e\u003cpre class=\"language-matlab\"\u003eans =\r\n\u003c/pre\u003e\u003cpre\u003e 7 1\r\n 9 3\u003c/pre\u003e\u003cp\u003eWhile this is what I am looking for:\u003c/p\u003e\u003cpre class=\"language-matlab\"\u003e\u0026gt;\u0026gt; modified_A = sub_double(A);\r\n\u0026gt;\u0026gt; modified_A([1 3], [3 1])\r\n\u003c/pre\u003e\u003cpre class=\"language-matlab\"\u003eans = \r\n\u003c/pre\u003e\u003cpre\u003e 7 3\u003c/pre\u003e\u003cpre class=\"language-matlab\"\u003e\u0026gt;\u0026gt; modified_A([1 2 2], [3 1 2])\r\n\u003c/pre\u003e\u003cpre class=\"language-matlab\"\u003eans = \r\n\u003c/pre\u003e\u003cpre\u003e 7 2 5\u003c/pre\u003e\u003cp\u003eIf there are given two subscripts vectors of the same lenght, return only those values which correspond to paired subscriptions.\u003c/p\u003e\u003cp\u003e\u003cb\u003eTask\u003c/b\u003e: You are given class template. Complete it to achieve desired behaviour.\u003c/p\u003e\u003cp\u003eAdditional info:\u003c/p\u003e\u003cul\u003e\u003cli\u003eIf you are not familiar with classes in MATLAB you can find more information \u003ca href = \"http://www.mathworks.com/help/matlab/matlab_oop/class-definition.html\"\u003ehere\u003c/a\u003e and \u003ca href = \"http://www.mathworks.com/help/matlab/customize-matlab-behavior.html\"\u003ehere\u003c/a\u003e or you can find it typing:\u003c/li\u003e\u003c/ul\u003e\u003cpre\u003e \u0026gt;\u0026gt; doc 'Class Definition'\r\n \u0026gt;\u0026gt; doc 'Customize MATLAB Behavior'\u003c/pre\u003e\u003cul\u003e\u003cli\u003eFeel free to modify the template,\u003c/li\u003e\u003cli\u003eYou can try your skills to write a function instead of a class. You can use anonymus functions, etc.,\u003c/li\u003e\u003cli\u003eUsing classes open another doors to cheat (easily). This is not a hacking problem, so please respect it (you can create some new, interesting problems :-) ),\u003c/li\u003e\u003cli\u003eIn this form it is solvable without using function \"builtin\" which is forbidden in cody. I can allow it in the testsuite if there will be need for it,\u003c/li\u003e\u003cli\u003eLook for more problems using tags below\u003c/li\u003e\u003c/ul\u003e\u003cp\u003eEnjoy!\u003c/p\u003e","function_template":"classdef sub_double \u003c double\r\n methods\r\n function obj = sub_double(in)\r\n obj = obj@double(in);\r\n end\r\n function out = subsref(obj,S)\r\n % ???? \r\n end\r\n end \r\nend","test_suite":"%%\r\n% first some basic tests\r\nA = 1;\r\nB = sub_double(A);\r\ny = B(1);\r\ny_correct = 1;\r\nassert(isequal(y,y_correct))\r\n%%\r\nA = [1 2 3\r\n 4 5 6\r\n 7 8 9];\r\nB = sub_double(A);\r\ny = B([1 3],[3 1]);\r\ny_correct = [3 7];\r\nassert(isequal(y,y_correct))\r\n%%\r\nA = [1 2 3\r\n 4 5 6\r\n 7 8 9];\r\nB = sub_double(A);\r\ny = B([1 3],[3 end]);\r\ny_correct = [3 9];\r\nassert(isequal(y,y_correct))\r\n%%\r\nA = [1 2 3\r\n 4 5 6\r\n 7 8 9];\r\nB = sub_double(A);\r\ny = B(1,[3 1]);\r\ny_correct = [3 1];\r\nassert(isequal(y,y_correct))\r\n%%\r\nA = [1 2 3\r\n 4 5 6\r\n 7 8 9];\r\nB = sub_double(A);\r\ny = B(2:end);\r\ny_correct = [4 7 2 5 8 3 6 9];\r\nassert(isequal(y,y_correct))\r\n%%\r\nA = magic(5);\r\nB = sub_double(A);\r\ny = B([1 5 4 3 2],[3 4 5 1 2]);\r\ny_correct = [1:5];\r\nassert(isequal(y,y_correct))\r\n%%\r\nA = magic(7);\r\nB = sub_double(A);\r\nrows = randi(7,1,10);\r\ncols = randi(7,1,10);\r\ny = B(rows,cols);\r\ny_correct = arrayfun(@(R,C)A(R,C),rows,cols);\r\nassert(isequal(y,y_correct))\r\n","published":true,"deleted":false,"likes_count":3,"comments_count":4,"created_by":14358,"edited_by":null,"edited_at":null,"deleted_by":null,"deleted_at":null,"solvers_count":13,"test_suite_updated_at":null,"rescore_all_solutions":false,"group_id":1,"created_at":"2015-01-18T00:16:14.000Z","updated_at":"2015-01-18T23:16:49.000Z","published_at":"2015-01-18T00:23:22.000Z","restored_at":null,"restored_by":null,"spam":false,"simulink":false,"admin_reviewed":false,"description_opc":"{\"relationships\":[{\"relationshipType\":\"http://schemas.mathworks.com/matlab/code/2013/relationships/document\",\"targetMode\":\"\",\"relationshipId\":\"rId1\",\"target\":\"/matlab/document.xml\"},{\"relationshipType\":\"http://schemas.mathworks.com/matlab/code/2013/relationships/output\",\"targetMode\":\"\",\"relationshipId\":\"rId2\",\"target\":\"/matlab/output.xml\"}],\"parts\":[{\"partUri\":\"/matlab/document.xml\",\"relationship\":[],\"contentType\":\"application/vnd.mathworks.matlab.code.document+xml\",\"content\":\"\u003c?xml version=\\\"1.0\\\" encoding=\\\"UTF-8\\\"?\u003e\\n\u003cw:document xmlns:w=\\\"http://schemas.openxmlformats.org/wordprocessingml/2006/main\\\"\u003e\u003cw:body\u003e\u003cw:p\u003e\u003cw:pPr\u003e\u003cw:pStyle w:val=\\\"text\\\"/\u003e\u003c/w:pPr\u003e\u003cw:r\u003e\u003cw:t\u003eMATLAB supports object-oriented programming. Let's take an advantage of it in cody.\u003c/w:t\u003e\u003c/w:r\u003e\u003c/w:p\u003e\u003cw:p\u003e\u003cw:pPr\u003e\u003cw:pStyle w:val=\\\"text\\\"/\u003e\u003c/w:pPr\u003e\u003cw:r\u003e\u003cw:t\u003eThis problem focus on modifying subscripted references for class double.\u003c/w:t\u003e\u003c/w:r\u003e\u003c/w:p\u003e\u003cw:p\u003e\u003cw:pPr\u003e\u003cw:pStyle w:val=\\\"text\\\"/\u003e\u003c/w:pPr\u003e\u003cw:r\u003e\u003cw:t\u003eThis example shows classical behavior:\u003c/w:t\u003e\u003c/w:r\u003e\u003c/w:p\u003e\u003cw:p\u003e\u003cw:pPr\u003e\u003cw:pStyle w:val=\\\"code\\\"/\u003e\u003c/w:pPr\u003e\u003cw:r\u003e\u003cw:t\u003e\u003c![CDATA[\u003e\u003e A = [1 4 7\\n 2 5 8\\n 3 6 9];\\n\u003e\u003e A([1 3], [3 1])\\n\\nans =\\n\\n 7 1\\n 9 3]]\u003e\u003c/w:t\u003e\u003c/w:r\u003e\u003c/w:p\u003e\u003cw:p\u003e\u003cw:pPr\u003e\u003cw:pStyle w:val=\\\"text\\\"/\u003e\u003c/w:pPr\u003e\u003cw:r\u003e\u003cw:t\u003eWhile this is what I am looking for:\u003c/w:t\u003e\u003c/w:r\u003e\u003c/w:p\u003e\u003cw:p\u003e\u003cw:pPr\u003e\u003cw:pStyle w:val=\\\"code\\\"/\u003e\u003c/w:pPr\u003e\u003cw:r\u003e\u003cw:t\u003e\u003c![CDATA[\u003e\u003e modified_A = sub_double(A);\\n\u003e\u003e modified_A([1 3], [3 1])\\n\\nans = \\n\\n 7 3\\n\\n\u003e\u003e modified_A([1 2 2], [3 1 2])\\n\\nans = \\n\\n 7 2 5]]\u003e\u003c/w:t\u003e\u003c/w:r\u003e\u003c/w:p\u003e\u003cw:p\u003e\u003cw:pPr\u003e\u003cw:pStyle w:val=\\\"text\\\"/\u003e\u003c/w:pPr\u003e\u003cw:r\u003e\u003cw:t\u003eIf there are given two subscripts vectors of the same lenght, return only those values which correspond to paired subscriptions.\u003c/w:t\u003e\u003c/w:r\u003e\u003c/w:p\u003e\u003cw:p\u003e\u003cw:pPr\u003e\u003cw:pStyle w:val=\\\"text\\\"/\u003e\u003c/w:pPr\u003e\u003cw:r\u003e\u003cw:rPr\u003e\u003cw:b/\u003e\u003c/w:rPr\u003e\u003cw:t\u003eTask\u003c/w:t\u003e\u003c/w:r\u003e\u003cw:r\u003e\u003cw:t\u003e: You are given class template. Complete it to achieve desired behaviour.\u003c/w:t\u003e\u003c/w:r\u003e\u003c/w:p\u003e\u003cw:p\u003e\u003cw:pPr\u003e\u003cw:pStyle w:val=\\\"text\\\"/\u003e\u003c/w:pPr\u003e\u003cw:r\u003e\u003cw:t\u003eAdditional info:\u003c/w:t\u003e\u003c/w:r\u003e\u003c/w:p\u003e\u003cw:p\u003e\u003cw:pPr\u003e\u003cw:pStyle w:val=\\\"ListParagraph\\\"/\u003e\u003cw:numPr\u003e\u003cw:numId w:val=\\\"1\\\"/\u003e\u003c/w:numPr\u003e\u003c/w:pPr\u003e\u003cw:r\u003e\u003cw:t\u003eIf you are not familiar with classes in MATLAB you can find more information\u003c/w:t\u003e\u003c/w:r\u003e\u003cw:r\u003e\u003cw:t\u003e \u003c/w:t\u003e\u003c/w:r\u003e\u003cw:hyperlink w:docLocation=\\\"http://www.mathworks.com/help/matlab/matlab_oop/class-definition.html\\\"\u003e\u003cw:r\u003e\u003cw:t\u003ehere\u003c/w:t\u003e\u003c/w:r\u003e\u003c/w:hyperlink\u003e\u003cw:r\u003e\u003cw:t\u003e and\u003c/w:t\u003e\u003c/w:r\u003e\u003cw:r\u003e\u003cw:t\u003e \u003c/w:t\u003e\u003c/w:r\u003e\u003cw:hyperlink w:docLocation=\\\"http://www.mathworks.com/help/matlab/customize-matlab-behavior.html\\\"\u003e\u003cw:r\u003e\u003cw:t\u003ehere\u003c/w:t\u003e\u003c/w:r\u003e\u003c/w:hyperlink\u003e\u003cw:r\u003e\u003cw:t\u003e or you can find it typing:\u003c/w:t\u003e\u003c/w:r\u003e\u003c/w:p\u003e\u003cw:p\u003e\u003cw:pPr\u003e\u003cw:pStyle w:val=\\\"code\\\"/\u003e\u003c/w:pPr\u003e\u003cw:r\u003e\u003cw:t\u003e\u003c![CDATA[ \u003e\u003e doc 'Class Definition'\\n \u003e\u003e doc 'Customize MATLAB Behavior']]\u003e\u003c/w:t\u003e\u003c/w:r\u003e\u003c/w:p\u003e\u003cw:p\u003e\u003cw:pPr\u003e\u003cw:pStyle w:val=\\\"ListParagraph\\\"/\u003e\u003cw:numPr\u003e\u003cw:numId w:val=\\\"1\\\"/\u003e\u003c/w:numPr\u003e\u003c/w:pPr\u003e\u003cw:r\u003e\u003cw:t\u003eFeel free to modify the template,\u003c/w:t\u003e\u003c/w:r\u003e\u003c/w:p\u003e\u003cw:p\u003e\u003cw:pPr\u003e\u003cw:pStyle w:val=\\\"ListParagraph\\\"/\u003e\u003cw:numPr\u003e\u003cw:numId w:val=\\\"1\\\"/\u003e\u003c/w:numPr\u003e\u003c/w:pPr\u003e\u003cw:r\u003e\u003cw:t\u003eYou can try your skills to write a function instead of a class. You can use anonymus functions, etc.,\u003c/w:t\u003e\u003c/w:r\u003e\u003c/w:p\u003e\u003cw:p\u003e\u003cw:pPr\u003e\u003cw:pStyle w:val=\\\"ListParagraph\\\"/\u003e\u003cw:numPr\u003e\u003cw:numId w:val=\\\"1\\\"/\u003e\u003c/w:numPr\u003e\u003c/w:pPr\u003e\u003cw:r\u003e\u003cw:t\u003eUsing classes open another doors to cheat (easily). This is not a hacking problem, so please respect it (you can create some new, interesting problems :-) ),\u003c/w:t\u003e\u003c/w:r\u003e\u003c/w:p\u003e\u003cw:p\u003e\u003cw:pPr\u003e\u003cw:pStyle w:val=\\\"ListParagraph\\\"/\u003e\u003cw:numPr\u003e\u003cw:numId w:val=\\\"1\\\"/\u003e\u003c/w:numPr\u003e\u003c/w:pPr\u003e\u003cw:r\u003e\u003cw:t\u003eIn this form it is solvable without using function \\\"builtin\\\" which is forbidden in cody. I can allow it in the testsuite if there will be need for it,\u003c/w:t\u003e\u003c/w:r\u003e\u003c/w:p\u003e\u003cw:p\u003e\u003cw:pPr\u003e\u003cw:pStyle w:val=\\\"ListParagraph\\\"/\u003e\u003cw:numPr\u003e\u003cw:numId w:val=\\\"1\\\"/\u003e\u003c/w:numPr\u003e\u003c/w:pPr\u003e\u003cw:r\u003e\u003cw:t\u003eLook for more problems using tags below\u003c/w:t\u003e\u003c/w:r\u003e\u003c/w:p\u003e\u003cw:p\u003e\u003cw:pPr\u003e\u003cw:pStyle w:val=\\\"text\\\"/\u003e\u003c/w:pPr\u003e\u003cw:r\u003e\u003cw:t\u003eEnjoy!\u003c/w:t\u003e\u003c/w:r\u003e\u003c/w:p\u003e\u003c/w:body\u003e\u003c/w:document\u003e\"},{\"partUri\":\"/matlab/output.xml\",\"contentType\":\"text/xml\",\"content\":\"\u003c?xml version=\\\"1.0\\\" encoding=\\\"UTF-8\\\" standalone=\\\"no\\\" ?\u003e\u003cembeddedOutputs\u003e\u003cmetaData\u003e\u003cevaluationState\u003emanual\u003c/evaluationState\u003e\u003clayoutState\u003ecode\u003c/layoutState\u003e\u003coutputStatus\u003eready\u003c/outputStatus\u003e\u003c/metaData\u003e\u003coutputArray type=\\\"array\\\"/\u003e\u003cregionArray type=\\\"array\\\"/\u003e\u003c/embeddedOutputs\u003e\"}]}"},{"id":44263,"title":"Multivariate polynomials - emulate symbolic form","description":"In \u003chttps://www.mathworks.com/matlabcentral/cody/problems/44262-multivariate-polynomials-overload-multiplication Problem 44262\u003e I asked you to create a class |mPoly| with overloaded multiplication, so a product of two polynomials can be expressed in the form |p = p1*p2|. However, the method of constructing these polynomials is still somewhat unintuitive. In the \u003chttps://www.mathworks.com/products/symbolic.html Symbolic Math Toolbox\u003e, one can simply define some variables,\r\n\r\n syms x y z\r\n\r\nand then create a polynomial:\r\n\r\n p = 2*x*y + 3*x^5*z;\r\n\r\nWe would like to do something like that here. As a start, create a class |mPolySym| with properties |exponents| and |coefficients|, and |varnames|, where the first two properties are the same as in previous problems and |varnames| is a \u003chttps://www.mathworks.com/help/matlab/characters-and-strings.html string array\u003e. The constructor should accept a numeric, char or string input, e.g.,\r\n\r\n x = mPolySym('x')\r\n\r\n x = \r\n\r\n mPolySym with properties:\r\n\r\n varnames: \"x\"\r\n exponents: 1\r\n coefficients: 1\r\n\r\n r = mPolySym(pi)\r\n\r\n r = \r\n\r\n mPolySym with properties:\r\n\r\n varnames: [0×0 string]\r\n exponents: 1\r\n coefficients: 3.1416\r\n\r\nAlso modify the method |mtimes| from the previous problem so it can multiply polynomials with different variable names.","description_html":"\u003cp\u003eIn \u003ca href = \"https://www.mathworks.com/matlabcentral/cody/problems/44262-multivariate-polynomials-overload-multiplication\"\u003eProblem 44262\u003c/a\u003e I asked you to create a class \u003ctt\u003emPoly\u003c/tt\u003e with overloaded multiplication, so a product of two polynomials can be expressed in the form \u003ctt\u003ep = p1*p2\u003c/tt\u003e. However, the method of constructing these polynomials is still somewhat unintuitive. In the \u003ca href = \"https://www.mathworks.com/products/symbolic.html\"\u003eSymbolic Math Toolbox\u003c/a\u003e, one can simply define some variables,\u003c/p\u003e\u003cpre class=\"language-matlab\"\u003esyms x y z\r\n\u003c/pre\u003e\u003cp\u003eand then create a polynomial:\u003c/p\u003e\u003cpre class=\"language-matlab\"\u003ep = 2*x*y + 3*x^5*z;\r\n\u003c/pre\u003e\u003cp\u003eWe would like to do something like that here. As a start, create a class \u003ctt\u003emPolySym\u003c/tt\u003e with properties \u003ctt\u003eexponents\u003c/tt\u003e and \u003ctt\u003ecoefficients\u003c/tt\u003e, and \u003ctt\u003evarnames\u003c/tt\u003e, where the first two properties are the same as in previous problems and \u003ctt\u003evarnames\u003c/tt\u003e is a \u003ca href = \"https://www.mathworks.com/help/matlab/characters-and-strings.html\"\u003estring array\u003c/a\u003e. The constructor should accept a numeric, char or string input, e.g.,\u003c/p\u003e\u003cpre class=\"language-matlab\"\u003ex = mPolySym('x')\r\n\u003c/pre\u003e\u003cpre class=\"language-matlab\"\u003ex = \r\n\u003c/pre\u003e\u003cpre class=\"language-matlab\"\u003emPolySym with properties:\r\n\u003c/pre\u003e\u003cpre\u003e varnames: \"x\"\r\n exponents: 1\r\n coefficients: 1\u003c/pre\u003e\u003cpre class=\"language-matlab\"\u003er = mPolySym(pi)\r\n\u003c/pre\u003e\u003cpre class=\"language-matlab\"\u003er = \r\n\u003c/pre\u003e\u003cpre class=\"language-matlab\"\u003emPolySym with properties:\r\n\u003c/pre\u003e\u003cpre\u003e varnames: [0×0 string]\r\n exponents: 1\r\n coefficients: 3.1416\u003c/pre\u003e\u003cp\u003eAlso modify the method \u003ctt\u003emtimes\u003c/tt\u003e from the previous problem so it can multiply polynomials with different variable names.\u003c/p\u003e","function_template":"classdef mPolySym\r\n properties\r\n varnames\r\n exponents\r\n coefficients\r\n end\r\n \r\n methods\r\n function p = mPolySym(s)\r\n end\r\n \r\n function p = mtimes(p1,p2)\r\n end \r\n end\r\n \r\nend\r\n\r\n","test_suite":"%% Test mPolySym\r\nfiletext = fileread('mPolySym.m');\r\nassert(~contains(filetext,'regexp'))\r\n\r\n\r\n%%\r\nr = randi(1000);\r\nx = mPolySym(r);\r\nassert(isempty(x.varnames))\r\nassert(isequal(x.exponents,0))\r\nassert(isequal(x.coefficients,r))\r\n\r\n%%\r\nr = randi(1000);\r\nx = mPolySym('x');\r\ny = r*x;\r\nassert(isequal(y.varnames,\"x\"))\r\nassert(isequal(y.exponents,1))\r\nassert(isequal(y.coefficients,r))\r\nassert(isequal(r*x,x*r))\r\n\r\n%%\r\nx = mPolySym('x');\r\ny = mPolySym(\"y\");\r\nz = mPolySym('z');\r\nw = x*y*z;\r\nassert(isequal(w.varnames,[\"x\" \"y\" \"z\"]))\r\nassert(isequal(w.exponents,[1 1 1]))\r\nassert(isequal(w.coefficients,1))\r\n\r\n%%\r\nm = randi(5);\r\nn = randi(4);\r\nx = mPolySym(\"x\");\r\ny = mPolySym(\"y\");\r\np = [repmat(x,1,m) repmat(y,1,n)];\r\np = p(randperm(length(p)));\r\nr = randi(1000);\r\np_prod = r;\r\nfor ii=1:length(p)\r\n p_prod = p_prod*p(ii);\r\nend\r\ns = randi(1000);\r\np_prod = p_prod*s;\r\nassert(isequal(p_prod.varnames,[\"x\" \"y\"]))\r\nassert(isequal(p_prod.exponents,[m n]))\r\nassert(isequal(p_prod.coefficients,r*s))","published":true,"deleted":false,"likes_count":2,"comments_count":0,"created_by":1011,"edited_by":null,"edited_at":null,"deleted_by":null,"deleted_at":null,"solvers_count":8,"test_suite_updated_at":null,"rescore_all_solutions":false,"group_id":1,"created_at":"2017-07-14T23:13:17.000Z","updated_at":"2025-12-22T13:23:36.000Z","published_at":"2017-07-14T23:13:34.000Z","restored_at":null,"restored_by":null,"spam":false,"simulink":false,"admin_reviewed":false,"description_opc":"{\"relationships\":[{\"relationshipType\":\"http://schemas.mathworks.com/matlab/code/2013/relationships/document\",\"targetMode\":\"\",\"relationshipId\":\"rId1\",\"target\":\"/matlab/document.xml\"},{\"relationshipType\":\"http://schemas.mathworks.com/matlab/code/2013/relationships/output\",\"targetMode\":\"\",\"relationshipId\":\"rId2\",\"target\":\"/matlab/output.xml\"}],\"parts\":[{\"partUri\":\"/matlab/document.xml\",\"relationship\":[],\"contentType\":\"application/vnd.mathworks.matlab.code.document+xml\",\"content\":\"\u003c?xml version=\\\"1.0\\\" encoding=\\\"UTF-8\\\"?\u003e\\n\u003cw:document xmlns:w=\\\"http://schemas.openxmlformats.org/wordprocessingml/2006/main\\\"\u003e\u003cw:body\u003e\u003cw:p\u003e\u003cw:pPr\u003e\u003cw:pStyle w:val=\\\"text\\\"/\u003e\u003c/w:pPr\u003e\u003cw:r\u003e\u003cw:t\u003eIn\u003c/w:t\u003e\u003c/w:r\u003e\u003cw:r\u003e\u003cw:t\u003e \u003c/w:t\u003e\u003c/w:r\u003e\u003cw:hyperlink w:docLocation=\\\"https://www.mathworks.com/matlabcentral/cody/problems/44262-multivariate-polynomials-overload-multiplication\\\"\u003e\u003cw:r\u003e\u003cw:t\u003eProblem 44262\u003c/w:t\u003e\u003c/w:r\u003e\u003c/w:hyperlink\u003e\u003cw:r\u003e\u003cw:t\u003e I asked you to create a class\u003c/w:t\u003e\u003c/w:r\u003e\u003cw:r\u003e\u003cw:t\u003e \u003c/w:t\u003e\u003c/w:r\u003e\u003cw:r\u003e\u003cw:rPr\u003e\u003cw:rFonts w:cs=\\\"monospace\\\"/\u003e\u003c/w:rPr\u003e\u003cw:t\u003emPoly\u003c/w:t\u003e\u003c/w:r\u003e\u003cw:r\u003e\u003cw:t\u003e with overloaded multiplication, so a product of two polynomials can be expressed in the form\u003c/w:t\u003e\u003c/w:r\u003e\u003cw:r\u003e\u003cw:t\u003e \u003c/w:t\u003e\u003c/w:r\u003e\u003cw:r\u003e\u003cw:rPr\u003e\u003cw:rFonts w:cs=\\\"monospace\\\"/\u003e\u003c/w:rPr\u003e\u003cw:t\u003ep = p1*p2\u003c/w:t\u003e\u003c/w:r\u003e\u003cw:r\u003e\u003cw:t\u003e. However, the method of constructing these polynomials is still somewhat unintuitive. In the\u003c/w:t\u003e\u003c/w:r\u003e\u003cw:r\u003e\u003cw:t\u003e \u003c/w:t\u003e\u003c/w:r\u003e\u003cw:hyperlink w:docLocation=\\\"https://www.mathworks.com/products/symbolic.html\\\"\u003e\u003cw:r\u003e\u003cw:t\u003eSymbolic Math Toolbox\u003c/w:t\u003e\u003c/w:r\u003e\u003c/w:hyperlink\u003e\u003cw:r\u003e\u003cw:t\u003e, one can simply define some variables,\u003c/w:t\u003e\u003c/w:r\u003e\u003c/w:p\u003e\u003cw:p\u003e\u003cw:pPr\u003e\u003cw:pStyle w:val=\\\"code\\\"/\u003e\u003c/w:pPr\u003e\u003cw:r\u003e\u003cw:t\u003e\u003c![CDATA[syms x y z]]\u003e\u003c/w:t\u003e\u003c/w:r\u003e\u003c/w:p\u003e\u003cw:p\u003e\u003cw:pPr\u003e\u003cw:pStyle w:val=\\\"text\\\"/\u003e\u003c/w:pPr\u003e\u003cw:r\u003e\u003cw:t\u003eand then create a polynomial:\u003c/w:t\u003e\u003c/w:r\u003e\u003c/w:p\u003e\u003cw:p\u003e\u003cw:pPr\u003e\u003cw:pStyle w:val=\\\"code\\\"/\u003e\u003c/w:pPr\u003e\u003cw:r\u003e\u003cw:t\u003e\u003c![CDATA[p = 2*x*y + 3*x^5*z;]]\u003e\u003c/w:t\u003e\u003c/w:r\u003e\u003c/w:p\u003e\u003cw:p\u003e\u003cw:pPr\u003e\u003cw:pStyle w:val=\\\"text\\\"/\u003e\u003c/w:pPr\u003e\u003cw:r\u003e\u003cw:t\u003eWe would like to do something like that here. As a start, create a class\u003c/w:t\u003e\u003c/w:r\u003e\u003cw:r\u003e\u003cw:t\u003e \u003c/w:t\u003e\u003c/w:r\u003e\u003cw:r\u003e\u003cw:rPr\u003e\u003cw:rFonts w:cs=\\\"monospace\\\"/\u003e\u003c/w:rPr\u003e\u003cw:t\u003emPolySym\u003c/w:t\u003e\u003c/w:r\u003e\u003cw:r\u003e\u003cw:t\u003e with properties\u003c/w:t\u003e\u003c/w:r\u003e\u003cw:r\u003e\u003cw:t\u003e \u003c/w:t\u003e\u003c/w:r\u003e\u003cw:r\u003e\u003cw:rPr\u003e\u003cw:rFonts w:cs=\\\"monospace\\\"/\u003e\u003c/w:rPr\u003e\u003cw:t\u003eexponents\u003c/w:t\u003e\u003c/w:r\u003e\u003cw:r\u003e\u003cw:t\u003e and\u003c/w:t\u003e\u003c/w:r\u003e\u003cw:r\u003e\u003cw:t\u003e \u003c/w:t\u003e\u003c/w:r\u003e\u003cw:r\u003e\u003cw:rPr\u003e\u003cw:rFonts w:cs=\\\"monospace\\\"/\u003e\u003c/w:rPr\u003e\u003cw:t\u003ecoefficients\u003c/w:t\u003e\u003c/w:r\u003e\u003cw:r\u003e\u003cw:t\u003e, and\u003c/w:t\u003e\u003c/w:r\u003e\u003cw:r\u003e\u003cw:t\u003e \u003c/w:t\u003e\u003c/w:r\u003e\u003cw:r\u003e\u003cw:rPr\u003e\u003cw:rFonts w:cs=\\\"monospace\\\"/\u003e\u003c/w:rPr\u003e\u003cw:t\u003evarnames\u003c/w:t\u003e\u003c/w:r\u003e\u003cw:r\u003e\u003cw:t\u003e, where the first two properties are the same as in previous problems and\u003c/w:t\u003e\u003c/w:r\u003e\u003cw:r\u003e\u003cw:t\u003e \u003c/w:t\u003e\u003c/w:r\u003e\u003cw:r\u003e\u003cw:rPr\u003e\u003cw:rFonts w:cs=\\\"monospace\\\"/\u003e\u003c/w:rPr\u003e\u003cw:t\u003evarnames\u003c/w:t\u003e\u003c/w:r\u003e\u003cw:r\u003e\u003cw:t\u003e is a\u003c/w:t\u003e\u003c/w:r\u003e\u003cw:r\u003e\u003cw:t\u003e \u003c/w:t\u003e\u003c/w:r\u003e\u003cw:hyperlink w:docLocation=\\\"https://www.mathworks.com/help/matlab/characters-and-strings.html\\\"\u003e\u003cw:r\u003e\u003cw:t\u003estring array\u003c/w:t\u003e\u003c/w:r\u003e\u003c/w:hyperlink\u003e\u003cw:r\u003e\u003cw:t\u003e. The constructor should accept a numeric, char or string input, e.g.,\u003c/w:t\u003e\u003c/w:r\u003e\u003c/w:p\u003e\u003cw:p\u003e\u003cw:pPr\u003e\u003cw:pStyle w:val=\\\"code\\\"/\u003e\u003c/w:pPr\u003e\u003cw:r\u003e\u003cw:t\u003e\u003c![CDATA[x = mPolySym('x')\\n\\nx = \\n\\nmPolySym with properties:\\n\\n varnames: \\\"x\\\"\\n exponents: 1\\n coefficients: 1\\n\\nr = mPolySym(pi)\\n\\nr = \\n\\nmPolySym with properties:\\n\\n varnames: [0×0 string]\\n exponents: 1\\n coefficients: 3.1416]]\u003e\u003c/w:t\u003e\u003c/w:r\u003e\u003c/w:p\u003e\u003cw:p\u003e\u003cw:pPr\u003e\u003cw:pStyle w:val=\\\"text\\\"/\u003e\u003c/w:pPr\u003e\u003cw:r\u003e\u003cw:t\u003eAlso modify the method\u003c/w:t\u003e\u003c/w:r\u003e\u003cw:r\u003e\u003cw:t\u003e \u003c/w:t\u003e\u003c/w:r\u003e\u003cw:r\u003e\u003cw:rPr\u003e\u003cw:rFonts w:cs=\\\"monospace\\\"/\u003e\u003c/w:rPr\u003e\u003cw:t\u003emtimes\u003c/w:t\u003e\u003c/w:r\u003e\u003cw:r\u003e\u003cw:t\u003e from the previous problem so it can multiply polynomials with different variable names.\u003c/w:t\u003e\u003c/w:r\u003e\u003c/w:p\u003e\u003c/w:body\u003e\u003c/w:document\u003e\"},{\"partUri\":\"/matlab/output.xml\",\"contentType\":\"text/xml\",\"content\":\"\u003c?xml version=\\\"1.0\\\" encoding=\\\"UTF-8\\\" standalone=\\\"no\\\" ?\u003e\u003cembeddedOutputs\u003e\u003cmetaData\u003e\u003cevaluationState\u003emanual\u003c/evaluationState\u003e\u003clayoutState\u003ecode\u003c/layoutState\u003e\u003coutputStatus\u003eready\u003c/outputStatus\u003e\u003c/metaData\u003e\u003coutputArray type=\\\"array\\\"/\u003e\u003cregionArray type=\\\"array\\\"/\u003e\u003c/embeddedOutputs\u003e\"}]}"},{"id":2837,"title":"Modify subscripts","description":"MATLAB supports object-oriented programming. Let's take an advantage of it in cody.\r\n\r\nThis problem starts \u003chttp://uk.mathworks.com/matlabcentral/cody/problems/2836-class-ics-modify-subscripts-easy here\u003e.\r\n\r\nLet's take things a bit more seriously. There are _subsasgn_ and _subsref_ to overload:\r\n\r\n \u003e\u003e A = sub_double([ 1 4 7\r\n 2 5 8\r\n 3 6 9]);\r\n \u003e\u003e A([1 3],[3 1])\r\n \r\n ans = \r\n\r\n 3x3 sub_double:\r\n\r\n double data: \r\n 7 3\r\n \r\n \u003e\u003e A([1 2 3],[3 2 1]) = 0\r\n \r\n A = \r\n\r\n 3x3 sub_double:\r\n\r\n double data:\r\n 1 2 0\r\n 4 0 6\r\n 0 8 9\r\n\r\n \u003e\u003e A(:)'\r\n \r\n ans = \r\n \r\n 1x9 sub_double:\r\n \r\n double data:\r\n 1 4 0 2 0 8 0 6 9\r\n \r\n \u003e\u003e A(:,:)\r\n \r\n ans = \r\n \r\n 1x3 sub_double:\r\n \r\n double data:\r\n 1 0 9\r\n\r\n\r\n","description_html":"\u003cp\u003eMATLAB supports object-oriented programming. Let's take an advantage of it in cody.\u003c/p\u003e\u003cp\u003eThis problem starts \u003ca href = \"http://uk.mathworks.com/matlabcentral/cody/problems/2836-class-ics-modify-subscripts-easy\"\u003ehere\u003c/a\u003e.\u003c/p\u003e\u003cp\u003eLet's take things a bit more seriously. There are \u003ci\u003esubsasgn\u003c/i\u003e and \u003ci\u003esubsref\u003c/i\u003e to overload:\u003c/p\u003e\u003cpre class=\"language-matlab\"\u003e\u0026gt;\u0026gt; A = sub_double([ 1 4 7\r\n 2 5 8\r\n 3 6 9]);\r\n\u0026gt;\u0026gt; A([1 3],[3 1])\r\n\u003c/pre\u003e\u003cpre class=\"language-matlab\"\u003eans = \r\n\u003c/pre\u003e\u003cpre\u003e 3x3 sub_double:\u003c/pre\u003e\u003cpre\u003e double data: \r\n 7 3\u003c/pre\u003e\u003cpre class=\"language-matlab\"\u003e\u0026gt;\u0026gt; A([1 2 3],[3 2 1]) = 0\r\n\u003c/pre\u003e\u003cpre class=\"language-matlab\"\u003eA = \r\n\u003c/pre\u003e\u003cpre\u003e 3x3 sub_double:\u003c/pre\u003e\u003cpre\u003e double data:\r\n 1 2 0\r\n 4 0 6\r\n 0 8 9\u003c/pre\u003e\u003cpre class=\"language-matlab\"\u003e\u0026gt;\u0026gt; A(:)'\r\n\u003c/pre\u003e\u003cpre class=\"language-matlab\"\u003eans = \r\n\u003c/pre\u003e\u003cpre\u003e 1x9 sub_double:\u003c/pre\u003e\u003cpre\u003e double data:\r\n 1 4 0 2 0 8 0 6 9\u003c/pre\u003e\u003cpre class=\"language-matlab\"\u003e\u0026gt;\u0026gt; A(:,:)\r\n\u003c/pre\u003e\u003cpre class=\"language-matlab\"\u003eans = \r\n\u003c/pre\u003e\u003cpre\u003e 1x3 sub_double:\u003c/pre\u003e\u003cpre\u003e double data:\r\n 1 0 9\u003c/pre\u003e","function_template":"classdef sub_double \u003c double\r\n methods\r\n function obj = sub_double(in)\r\n obj = obj@double(in);\r\n end\r\n function out = subsref(obj,S)\r\n \r\n end\r\n end \r\nend","test_suite":"%%\r\n% first some basic tests\r\nA = 1;\r\nB = sub_double(A);\r\ny = B(1);\r\ny_correct = 1;\r\nassert(isequal(y,y_correct))\r\n%%\r\nA = [1 2 3\r\n 4 5 6\r\n 7 8 9];\r\nB = sub_double(A);\r\ny = B([1 3],[3 1]);\r\ny_correct = [3 7];\r\nassert(isequal(y,y_correct))\r\n%%\r\nA = [1 2 3\r\n 4 5 6\r\n 7 8 9];\r\nB = sub_double(A);\r\ny = B([1 3],[3 end]);\r\ny_correct = [3 9];\r\nassert(isequal(y,double(y_correct)))\r\n%%\r\nA = [1 2 3\r\n 4 5 6\r\n 7 8 9];\r\nB = sub_double(A);\r\ny = B(1,[3 1]);\r\ny_correct = [3 1];\r\nassert(isequal(y,y_correct))\r\n%%\r\nA = [1 2 3\r\n 4 5 6\r\n 7 8 9];\r\nB = sub_double(A);\r\ny = B(2:end);\r\ny_correct = [4 7 2 5 8 3 6 9];\r\nassert(isequal(y,y_correct))\r\n%%\r\nA = magic(5);\r\nB = sub_double(A);\r\ny = B([1 5 4 3 2],[3 4 5 1 2]);\r\ny_correct = [1:5];\r\nassert(isequal(y,y_correct))\r\n%%\r\nA = magic(7);\r\nB = sub_double(A);\r\nrows = randi(7,1,10);\r\ncols = randi(7,1,10);\r\ny = B(rows,cols);\r\ny_correct = arrayfun(@(R,C)A(R,C),rows,cols);\r\nassert(isequal(y,y_correct))\r\n%%\r\nA = 1;\r\nB = sub_double(A);\r\nB(1) = 3;\r\nA = 3;\r\nassert(isequal(A,B))\r\n%%\r\nA = [1 2 3\r\n 4 5 6\r\n 7 8 9];\r\nB = sub_double(A);\r\nB([1 2 3],[3 2 1]) = 0;\r\nA = [1 2 0\r\n 4 0 6\r\n 0 8 9];\r\nassert(isequal(A,B))\r\n%%\r\nA = [1 2 3\r\n 4 5 6\r\n 7 8 9];\r\nB = sub_double(A);\r\nB([1 3],[3 end]) = [7 7];\r\nA = [1 2 7\r\n 4 5 6\r\n 7 8 7];\r\nassert(isequal(double(A),double(B)))\r\n%%\r\nA = [1 2 3\r\n 4 5 6\r\n 7 8 9];\r\nB = sub_double(A);\r\ny = B(:,:);\r\ny_correct = [1 5 9];\r\nassert(isequal(y,y_correct))\r\n%%\r\nA = [1 2 3\r\n 4 5 6\r\n 7 8 9];\r\nB = sub_double(A);\r\nB(2:end) = [2:9];\r\nA = A';\r\nassert(isequal(B,A))\r\n%%\r\nA = magic(5);\r\nB = sub_double(A);\r\nB([1 5 4 3 2],[3 4 5 1 2])=0;\r\nassert(isequal(sum(~[B B']),ones(1,10)))\r\n%%\r\nA = magic(7);\r\nB = sub_double(A);\r\nrows = randi(7,1,10);\r\ncols = randi(7,1,10);\r\nvals = randi(7,1,10);\r\nB(rows,cols) = vals;\r\nfor k = 1:10\r\n A(rows(k),cols(k))=vals(k);\r\nend\r\nassert(isequal(A,B))","published":true,"deleted":false,"likes_count":1,"comments_count":0,"created_by":14358,"edited_by":null,"edited_at":null,"deleted_by":null,"deleted_at":null,"solvers_count":9,"test_suite_updated_at":null,"rescore_all_solutions":false,"group_id":1,"created_at":"2015-01-18T00:53:33.000Z","updated_at":"2015-01-18T23:17:44.000Z","published_at":"2015-01-18T01:36:53.000Z","restored_at":null,"restored_by":null,"spam":false,"simulink":false,"admin_reviewed":false,"description_opc":"{\"relationships\":[{\"relationshipType\":\"http://schemas.mathworks.com/matlab/code/2013/relationships/document\",\"targetMode\":\"\",\"relationshipId\":\"rId1\",\"target\":\"/matlab/document.xml\"},{\"relationshipType\":\"http://schemas.mathworks.com/matlab/code/2013/relationships/output\",\"targetMode\":\"\",\"relationshipId\":\"rId2\",\"target\":\"/matlab/output.xml\"}],\"parts\":[{\"partUri\":\"/matlab/document.xml\",\"relationship\":[],\"contentType\":\"application/vnd.mathworks.matlab.code.document+xml\",\"content\":\"\u003c?xml version=\\\"1.0\\\" encoding=\\\"UTF-8\\\"?\u003e\\n\u003cw:document xmlns:w=\\\"http://schemas.openxmlformats.org/wordprocessingml/2006/main\\\"\u003e\u003cw:body\u003e\u003cw:p\u003e\u003cw:pPr\u003e\u003cw:pStyle w:val=\\\"text\\\"/\u003e\u003c/w:pPr\u003e\u003cw:r\u003e\u003cw:t\u003eMATLAB supports object-oriented programming. Let's take an advantage of it in cody.\u003c/w:t\u003e\u003c/w:r\u003e\u003c/w:p\u003e\u003cw:p\u003e\u003cw:pPr\u003e\u003cw:pStyle w:val=\\\"text\\\"/\u003e\u003c/w:pPr\u003e\u003cw:r\u003e\u003cw:t\u003eThis problem starts\u003c/w:t\u003e\u003c/w:r\u003e\u003cw:r\u003e\u003cw:t\u003e \u003c/w:t\u003e\u003c/w:r\u003e\u003cw:hyperlink w:docLocation=\\\"http://uk.mathworks.com/matlabcentral/cody/problems/2836-class-ics-modify-subscripts-easy\\\"\u003e\u003cw:r\u003e\u003cw:t\u003ehere\u003c/w:t\u003e\u003c/w:r\u003e\u003c/w:hyperlink\u003e\u003cw:r\u003e\u003cw:t\u003e.\u003c/w:t\u003e\u003c/w:r\u003e\u003c/w:p\u003e\u003cw:p\u003e\u003cw:pPr\u003e\u003cw:pStyle w:val=\\\"text\\\"/\u003e\u003c/w:pPr\u003e\u003cw:r\u003e\u003cw:t\u003eLet's take things a bit more seriously. There are\u003c/w:t\u003e\u003c/w:r\u003e\u003cw:r\u003e\u003cw:t\u003e \u003c/w:t\u003e\u003c/w:r\u003e\u003cw:r\u003e\u003cw:rPr\u003e\u003cw:i/\u003e\u003c/w:rPr\u003e\u003cw:t\u003esubsasgn\u003c/w:t\u003e\u003c/w:r\u003e\u003cw:r\u003e\u003cw:t\u003e and\u003c/w:t\u003e\u003c/w:r\u003e\u003cw:r\u003e\u003cw:t\u003e \u003c/w:t\u003e\u003c/w:r\u003e\u003cw:r\u003e\u003cw:rPr\u003e\u003cw:i/\u003e\u003c/w:rPr\u003e\u003cw:t\u003esubsref\u003c/w:t\u003e\u003c/w:r\u003e\u003cw:r\u003e\u003cw:t\u003e to overload:\u003c/w:t\u003e\u003c/w:r\u003e\u003c/w:p\u003e\u003cw:p\u003e\u003cw:pPr\u003e\u003cw:pStyle w:val=\\\"code\\\"/\u003e\u003c/w:pPr\u003e\u003cw:r\u003e\u003cw:t\u003e\u003c![CDATA[\u003e\u003e A = sub_double([ 1 4 7\\n 2 5 8\\n 3 6 9]);\\n\u003e\u003e A([1 3],[3 1])\\n\\nans = \\n\\n 3x3 sub_double:\\n\\n double data: \\n 7 3\\n\\n\u003e\u003e A([1 2 3],[3 2 1]) = 0\\n\\nA = \\n\\n 3x3 sub_double:\\n\\n double data:\\n 1 2 0\\n 4 0 6\\n 0 8 9\\n\\n\u003e\u003e A(:)'\\n\\nans = \\n\\n 1x9 sub_double:\\n\\n double data:\\n 1 4 0 2 0 8 0 6 9\\n\\n\u003e\u003e A(:,:)\\n\\nans = \\n\\n 1x3 sub_double:\\n\\n double data:\\n 1 0 9]]\u003e\u003c/w:t\u003e\u003c/w:r\u003e\u003c/w:p\u003e\u003c/w:body\u003e\u003c/w:document\u003e\"},{\"partUri\":\"/matlab/output.xml\",\"contentType\":\"text/xml\",\"content\":\"\u003c?xml version=\\\"1.0\\\" encoding=\\\"UTF-8\\\" standalone=\\\"no\\\" ?\u003e\u003cembeddedOutputs\u003e\u003cmetaData\u003e\u003cevaluationState\u003emanual\u003c/evaluationState\u003e\u003clayoutState\u003ecode\u003c/layoutState\u003e\u003coutputStatus\u003eready\u003c/outputStatus\u003e\u003c/metaData\u003e\u003coutputArray type=\\\"array\\\"/\u003e\u003cregionArray type=\\\"array\\\"/\u003e\u003c/embeddedOutputs\u003e\"}]}"},{"id":44243,"title":"Ternary Conditional Operator","description":"Returns one of two expressions depending on a condition.\r\n\r\n (test) : (expression1) : (expression2)\r\n\r\n*test:* \r\nAny Boolean expression.\r\n\r\n*expression1:* \r\nA function handle called if test is true. \r\n\r\n*expression2:* \r\nA function handle called if test is false. \r\n\r\n*Example*\r\n\r\n \u003e\u003e a = (2 \u003e 1) : (@() 1) : (@() 2)\r\n a =\r\n 1\r\n \u003e\u003e a = (1 \u003e 2) : (@() 1) : (@() 2)\r\n a =\r\n 2\r\n\r\nThe |colon.m| you submitted will be moved to the class folder |@function_handle|:\r\n \r\n mkdir @function_handle\r\n movefile submission/colon.m @function_handle","description_html":"\u003cp\u003eReturns one of two expressions depending on a condition.\u003c/p\u003e\u003cpre class=\"language-matlab\"\u003e(test) : (expression1) : (expression2)\r\n\u003c/pre\u003e\u003cp\u003e\u003cb\u003etest:\u003c/b\u003e \r\nAny Boolean expression.\u003c/p\u003e\u003cp\u003e\u003cb\u003eexpression1:\u003c/b\u003e \r\nA function handle called if test is true.\u003c/p\u003e\u003cp\u003e\u003cb\u003eexpression2:\u003c/b\u003e \r\nA function handle called if test is false.\u003c/p\u003e\u003cp\u003e\u003cb\u003eExample\u003c/b\u003e\u003c/p\u003e\u003cpre class=\"language-matlab\"\u003e\u0026gt;\u0026gt; a = (2 \u0026gt; 1) : (@() 1) : (@() 2)\r\n a =\r\n 1\r\n\u0026gt;\u0026gt; a = (1 \u0026gt; 2) : (@() 1) : (@() 2)\r\n a =\r\n 2\r\n\u003c/pre\u003e\u003cp\u003eThe \u003ctt\u003ecolon.m\u003c/tt\u003e you submitted will be moved to the class folder \u003ctt\u003e@function_handle\u003c/tt\u003e:\u003c/p\u003e\u003cpre class=\"language-matlab\"\u003emkdir @function_handle\r\nmovefile submission/colon.m @function_handle\r\n\u003c/pre\u003e","function_template":"function y = colon1(test, expr1, expr2)\r\n y = expr1;\r\nend","test_suite":"%%\r\nmkdir @function_handle\r\nmovefile colon1.m @function_handle/colon.m\r\n\r\n%%\r\nassert(isequal((2 \u003e 1) : (@() 1) : (@() 2), 1))\r\n\r\n%%\r\nassert(isequal((1 \u003e 2) : (@() 1) : (@() 2), 2))\r\n\r\n%%\r\nfib = @(f, n) (n \u003e 2) : (@() f(f, n - 1) + f(f, n - 2)) : (@() 1);\r\nassert(fib(fib, 20) == 6765)\r\n\r\n%%\r\nx = magic(3);\r\n[m,I] = (x(1) \u003e 0) : (@() max(x)) : (@() min(x)) \r\nassert(isequal(m, [8 9 7]) \u0026\u0026 isequal(I, [1 3 2]))\r\n","published":true,"deleted":false,"likes_count":6,"comments_count":5,"created_by":1434,"edited_by":null,"edited_at":null,"deleted_by":null,"deleted_at":null,"solvers_count":12,"test_suite_updated_at":"2020-04-22T14:42:35.000Z","rescore_all_solutions":false,"group_id":52,"created_at":"2017-06-27T15:11:40.000Z","updated_at":"2026-03-05T14:28:10.000Z","published_at":"2017-06-27T15:11:40.000Z","restored_at":null,"restored_by":null,"spam":false,"simulink":false,"admin_reviewed":false,"description_opc":"{\"relationships\":[{\"relationshipType\":\"http://schemas.mathworks.com/matlab/code/2013/relationships/document\",\"targetMode\":\"\",\"relationshipId\":\"rId1\",\"target\":\"/matlab/document.xml\"},{\"relationshipType\":\"http://schemas.mathworks.com/matlab/code/2013/relationships/output\",\"targetMode\":\"\",\"relationshipId\":\"rId2\",\"target\":\"/matlab/output.xml\"}],\"parts\":[{\"partUri\":\"/matlab/document.xml\",\"relationship\":[],\"contentType\":\"application/vnd.mathworks.matlab.code.document+xml\",\"content\":\"\u003c?xml version=\\\"1.0\\\" encoding=\\\"UTF-8\\\"?\u003e\\n\u003cw:document xmlns:w=\\\"http://schemas.openxmlformats.org/wordprocessingml/2006/main\\\"\u003e\u003cw:body\u003e\u003cw:p\u003e\u003cw:pPr\u003e\u003cw:pStyle w:val=\\\"text\\\"/\u003e\u003c/w:pPr\u003e\u003cw:r\u003e\u003cw:t\u003eReturns one of two expressions depending on a condition.\u003c/w:t\u003e\u003c/w:r\u003e\u003c/w:p\u003e\u003cw:p\u003e\u003cw:pPr\u003e\u003cw:pStyle w:val=\\\"code\\\"/\u003e\u003c/w:pPr\u003e\u003cw:r\u003e\u003cw:t\u003e\u003c![CDATA[(test) : (expression1) : (expression2)]]\u003e\u003c/w:t\u003e\u003c/w:r\u003e\u003c/w:p\u003e\u003cw:p\u003e\u003cw:pPr\u003e\u003cw:pStyle w:val=\\\"text\\\"/\u003e\u003c/w:pPr\u003e\u003cw:r\u003e\u003cw:rPr\u003e\u003cw:b/\u003e\u003c/w:rPr\u003e\u003cw:t\u003etest:\u003c/w:t\u003e\u003c/w:r\u003e\u003cw:r\u003e\u003cw:t\u003e Any Boolean expression.\u003c/w:t\u003e\u003c/w:r\u003e\u003c/w:p\u003e\u003cw:p\u003e\u003cw:pPr\u003e\u003cw:pStyle w:val=\\\"text\\\"/\u003e\u003c/w:pPr\u003e\u003cw:r\u003e\u003cw:rPr\u003e\u003cw:b/\u003e\u003c/w:rPr\u003e\u003cw:t\u003eexpression1:\u003c/w:t\u003e\u003c/w:r\u003e\u003cw:r\u003e\u003cw:t\u003e A function handle called if test is true.\u003c/w:t\u003e\u003c/w:r\u003e\u003c/w:p\u003e\u003cw:p\u003e\u003cw:pPr\u003e\u003cw:pStyle w:val=\\\"text\\\"/\u003e\u003c/w:pPr\u003e\u003cw:r\u003e\u003cw:rPr\u003e\u003cw:b/\u003e\u003c/w:rPr\u003e\u003cw:t\u003eexpression2:\u003c/w:t\u003e\u003c/w:r\u003e\u003cw:r\u003e\u003cw:t\u003e A function handle called if test is false.\u003c/w:t\u003e\u003c/w:r\u003e\u003c/w:p\u003e\u003cw:p\u003e\u003cw:pPr\u003e\u003cw:pStyle w:val=\\\"text\\\"/\u003e\u003c/w:pPr\u003e\u003cw:r\u003e\u003cw:rPr\u003e\u003cw:b/\u003e\u003c/w:rPr\u003e\u003cw:t\u003eExample\u003c/w:t\u003e\u003c/w:r\u003e\u003c/w:p\u003e\u003cw:p\u003e\u003cw:pPr\u003e\u003cw:pStyle w:val=\\\"code\\\"/\u003e\u003c/w:pPr\u003e\u003cw:r\u003e\u003cw:t\u003e\u003c![CDATA[\u003e\u003e a = (2 \u003e 1) : (@() 1) : (@() 2)\\n a =\\n 1\\n\u003e\u003e a = (1 \u003e 2) : (@() 1) : (@() 2)\\n a =\\n 2]]\u003e\u003c/w:t\u003e\u003c/w:r\u003e\u003c/w:p\u003e\u003cw:p\u003e\u003cw:pPr\u003e\u003cw:pStyle w:val=\\\"text\\\"/\u003e\u003c/w:pPr\u003e\u003cw:r\u003e\u003cw:t\u003eThe\u003c/w:t\u003e\u003c/w:r\u003e\u003cw:r\u003e\u003cw:t\u003e \u003c/w:t\u003e\u003c/w:r\u003e\u003cw:r\u003e\u003cw:rPr\u003e\u003cw:rFonts w:cs=\\\"monospace\\\"/\u003e\u003c/w:rPr\u003e\u003cw:t\u003ecolon.m\u003c/w:t\u003e\u003c/w:r\u003e\u003cw:r\u003e\u003cw:t\u003e you submitted will be moved to the class folder\u003c/w:t\u003e\u003c/w:r\u003e\u003cw:r\u003e\u003cw:t\u003e \u003c/w:t\u003e\u003c/w:r\u003e\u003cw:r\u003e\u003cw:rPr\u003e\u003cw:rFonts w:cs=\\\"monospace\\\"/\u003e\u003c/w:rPr\u003e\u003cw:t\u003e@function_handle\u003c/w:t\u003e\u003c/w:r\u003e\u003cw:r\u003e\u003cw:t\u003e:\u003c/w:t\u003e\u003c/w:r\u003e\u003c/w:p\u003e\u003cw:p\u003e\u003cw:pPr\u003e\u003cw:pStyle w:val=\\\"code\\\"/\u003e\u003c/w:pPr\u003e\u003cw:r\u003e\u003cw:t\u003e\u003c![CDATA[mkdir @function_handle\\nmovefile submission/colon.m @function_handle]]\u003e\u003c/w:t\u003e\u003c/w:r\u003e\u003c/w:p\u003e\u003c/w:body\u003e\u003c/w:document\u003e\"},{\"partUri\":\"/matlab/output.xml\",\"contentType\":\"text/xml\",\"content\":\"\u003c?xml version=\\\"1.0\\\" encoding=\\\"UTF-8\\\" standalone=\\\"no\\\" ?\u003e\u003cembeddedOutputs\u003e\u003cmetaData\u003e\u003cevaluationState\u003emanual\u003c/evaluationState\u003e\u003clayoutState\u003ecode\u003c/layoutState\u003e\u003coutputStatus\u003eready\u003c/outputStatus\u003e\u003c/metaData\u003e\u003coutputArray type=\\\"array\\\"/\u003e\u003cregionArray type=\\\"array\\\"/\u003e\u003c/embeddedOutputs\u003e\"}]}"}],"term":"tag:\"class\"","current_player_id":null,"fields":[{"name":"page","type":"integer","callback":null,"default":1,"directive":null,"facet":null,"facet_method":"and","operator":null,"param":null,"static":null,"prepend":true},{"name":"per_page","type":"integer","callback":null,"default":50,"directive":null,"facet":null,"facet_method":"and","operator":null,"param":null,"static":null,"prepend":true},{"name":"sort","type":"string","callback":null,"default":null,"directive":null,"facet":null,"facet_method":"and","operator":null,"param":null,"static":null,"prepend":true},{"name":"body","type":"text","callback":null,"default":"*:*","directive":null,"facet":null,"facet_method":"and","operator":null,"param":"term","static":null,"prepend":false},{"name":"group","type":"string","callback":null,"default":null,"directive":"group","facet":true,"facet_method":"and","operator":null,"param":"term","static":null,"prepend":true},{"name":"difficulty_rating_bin","type":"string","callback":null,"default":null,"directive":"difficulty_rating_bin","facet":true,"facet_method":"and","operator":null,"param":"term","static":null,"prepend":true},{"name":"id","type":"integer","callback":null,"default":null,"directive":"id","facet":null,"facet_method":"and","operator":null,"param":"term","static":null,"prepend":true},{"name":"tag","type":"string","callback":null,"default":null,"directive":"tag","facet":null,"facet_method":"and","operator":null,"param":"term","static":null,"prepend":true},{"name":"product","type":"string","callback":null,"default":null,"directive":"product","facet":null,"facet_method":"and","operator":null,"param":"term","static":null,"prepend":true},{"name":"created_at","type":"timeframe","callback":{},"default":null,"directive":"created_at","facet":null,"facet_method":"and","operator":null,"param":"term","static":null,"prepend":true},{"name":"profile_id","type":"integer","callback":null,"default":null,"directive":"author_id","facet":null,"facet_method":"and","operator":null,"param":"term","static":null,"prepend":true},{"name":"created_by","type":"string","callback":null,"default":null,"directive":"author","facet":null,"facet_method":"and","operator":null,"param":"term","static":null,"prepend":true},{"name":"player_id","type":"integer","callback":null,"default":null,"directive":"solver_id","facet":null,"facet_method":"and","operator":null,"param":"term","static":null,"prepend":true},{"name":"player","type":"string","callback":null,"default":null,"directive":"solver","facet":null,"facet_method":"and","operator":null,"param":"term","static":null,"prepend":true},{"name":"solvers_count","type":"integer","callback":null,"default":null,"directive":"solvers_count","facet":null,"facet_method":"and","operator":null,"param":"term","static":null,"prepend":true},{"name":"comments_count","type":"integer","callback":null,"default":null,"directive":"comments_count","facet":null,"facet_method":"and","operator":null,"param":"term","static":null,"prepend":true},{"name":"likes_count","type":"integer","callback":null,"default":null,"directive":"likes_count","facet":null,"facet_method":"and","operator":null,"param":"term","static":null,"prepend":true},{"name":"leader_id","type":"integer","callback":null,"default":null,"directive":"leader_id","facet":null,"facet_method":"and","operator":null,"param":"term","static":null,"prepend":true},{"name":"leading_solution","type":"integer","callback":null,"default":null,"directive":"leading_solution","facet":null,"facet_method":"and","operator":null,"param":"term","static":null,"prepend":true}],"filters":[{"name":"asset_type","type":"string","callback":null,"default":null,"directive":null,"facet":null,"facet_method":"and","operator":null,"param":null,"static":"\"cody:problem\"","prepend":true},{"name":"profile_id","type":"integer","callback":{},"default":null,"directive":null,"facet":null,"facet_method":"and","operator":null,"param":"author_id","static":null,"prepend":true}],"query":{"params":{"per_page":50,"term":"tag:\"class\"","current_player":null,"sort":"map(difficulty_value,0,0,999) asc"},"parser":"MathWorks::Search::Solr::QueryParser","directives":{"term":{"directives":{"tag":[["tag:\"class\"","","\"","class","\""]]}}},"facets":{"#\u003cMathWorks::Search::Field:0x00007ff7fda871c0\u003e":null,"#\u003cMathWorks::Search::Field:0x00007ff7fda87120\u003e":null},"filters":{"#\u003cMathWorks::Search::Field:0x00007ff7fda86860\u003e":"\"cody:problem\""},"fields":{"#\u003cMathWorks::Search::Field:0x00007ff7fda87440\u003e":1,"#\u003cMathWorks::Search::Field:0x00007ff7fda873a0\u003e":50,"#\u003cMathWorks::Search::Field:0x00007ff7fda87300\u003e":"map(difficulty_value,0,0,999) asc","#\u003cMathWorks::Search::Field:0x00007ff7fda87260\u003e":"tag:\"class\""},"user_query":{"#\u003cMathWorks::Search::Field:0x00007ff7fda87260\u003e":"tag:\"class\""},"queried_facets":{}},"query_backend":{"connection":{"configuration":{"index_url":"http://index-op-v2/solr/","query_url":"http://search-op-v2/solr/","direct_access_index_urls":["http://index-op-v2/solr/"],"direct_access_query_urls":["http://search-op-v2/solr/"],"timeout":10,"vhost":"search","exchange":"search.topic","heartbeat":30,"pre_index_mode":false,"host":"rabbitmq-eks","port":5672,"username":"cody-search","password":"78X075ddcV44","virtual_host":"search","indexer":"amqp","http_logging":"true","core":"cody"},"query_connection":{"uri":"http://search-op-v2/solr/cody/","proxy":null,"connection":{"parallel_manager":null,"headers":{"User-Agent":"Faraday v1.0.1"},"params":{},"options":{"params_encoder":"Faraday::FlatParamsEncoder","proxy":null,"bind":null,"timeout":null,"open_timeout":null,"read_timeout":null,"write_timeout":null,"boundary":null,"oauth":null,"context":null,"on_data":null},"ssl":{"verify":true,"ca_file":null,"ca_path":null,"verify_mode":null,"cert_store":null,"client_cert":null,"client_key":null,"certificate":null,"private_key":null,"verify_depth":null,"version":null,"min_version":null,"max_version":null},"default_parallel_manager":null,"builder":{"adapter":{"name":"Faraday::Adapter::NetHttp","args":[],"block":null},"handlers":[{"name":"Faraday::Response::RaiseError","args":[],"block":null}],"app":{"app":{"ssl_cert_store":{"verify_callback":null,"error":null,"error_string":null,"chain":null,"time":null},"app":{},"connection_options":{},"config_block":null}}},"url_prefix":"http://search-op-v2/solr/cody/","manual_proxy":false,"proxy":null},"update_format":"RSolr::JSON::Generator","update_path":"update","options":{"url":"http://search-op-v2/solr/cody"}}},"query":{"params":{"per_page":50,"term":"tag:\"class\"","current_player":null,"sort":"map(difficulty_value,0,0,999) asc"},"parser":"MathWorks::Search::Solr::QueryParser","directives":{"term":{"directives":{"tag":[["tag:\"class\"","","\"","class","\""]]}}},"facets":{"#\u003cMathWorks::Search::Field:0x00007ff7fda871c0\u003e":null,"#\u003cMathWorks::Search::Field:0x00007ff7fda87120\u003e":null},"filters":{"#\u003cMathWorks::Search::Field:0x00007ff7fda86860\u003e":"\"cody:problem\""},"fields":{"#\u003cMathWorks::Search::Field:0x00007ff7fda87440\u003e":1,"#\u003cMathWorks::Search::Field:0x00007ff7fda873a0\u003e":50,"#\u003cMathWorks::Search::Field:0x00007ff7fda87300\u003e":"map(difficulty_value,0,0,999) asc","#\u003cMathWorks::Search::Field:0x00007ff7fda87260\u003e":"tag:\"class\""},"user_query":{"#\u003cMathWorks::Search::Field:0x00007ff7fda87260\u003e":"tag:\"class\""},"queried_facets":{}},"options":{"fields":["id","difficulty_rating"]},"join":" "},"results":[{"id":1275,"difficulty_rating":"easy"},{"id":1262,"difficulty_rating":"easy"},{"id":2003,"difficulty_rating":"easy-medium"},{"id":44262,"difficulty_rating":"medium"},{"id":42710,"difficulty_rating":"medium"},{"id":2836,"difficulty_rating":"medium"},{"id":44263,"difficulty_rating":"medium-hard"},{"id":2837,"difficulty_rating":"medium-hard"},{"id":44243,"difficulty_rating":"medium-hard"}]}}