{"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":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\"}]}"}],"problem_search":{"errors":[],"problems":[{"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. 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