{"group":{"id":1,"name":"Community","lockable":false,"created_at":"2012-01-18T18:02:15.000Z","updated_at":"2026-06-05T00:10:21.000Z","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":"2026-06-05T00:00:00.000Z","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":1430,"title":"Create an n-by-n null matrix and fill with ones certain positions","description":"The positions will be indicated by a z-by-2 matrix. Each row in this z-by-2 matrix will have the row and column in which a 1 has to be placed.\r\n\r\nExample:\r\n\r\n|n=3;|\r\n\r\n|mat=[1 3; 2 1];| --\u003e We want A(1,3)=1 and A(2,1)=1\r\n\r\n|A = FillWithOnes(n,mat);|\r\n\r\n|A=[0 0 1;\r\n    1 0 0;\r\n    0 0 0];|","description_html":"\u003cp\u003eThe positions will be indicated by a z-by-2 matrix. Each row in this z-by-2 matrix will have the row and column in which a 1 has to be placed.\u003c/p\u003e\u003cp\u003eExample:\u003c/p\u003e\u003cp\u003e\u003ctt\u003en=3;\u003c/tt\u003e\u003c/p\u003e\u003cp\u003e\u003ctt\u003emat=[1 3; 2 1];\u003c/tt\u003e --\u003e We want A(1,3)=1 and A(2,1)=1\u003c/p\u003e\u003cp\u003e\u003ctt\u003eA = FillWithOnes(n,mat);\u003c/tt\u003e\u003c/p\u003e\u003cp\u003e\u003ctt\u003eA=[0 0 1;\r\n    1 0 0;\r\n    0 0 0];\u003c/tt\u003e\u003c/p\u003e","function_template":"function A = FillWithOnes(n,mat)\r\n  A = zeros(n);\r\nend","test_suite":"%%\r\nn = 1;\r\nmat=[1 1];\r\nok = 1;\r\nassert(isequal(FillWithOnes(n,mat),ok))\r\n\r\n%%\r\nn = 2;\r\nmat=[1 2; 2 1];\r\nok = [0 1; 1 0];\r\nassert(isequal(FillWithOnes(n,mat),ok))\r\n\r\n%%\r\nn=3;\r\nmat=[1 3; 3 2; 3 3];\r\nok = [0 0 1; 0 0 0; 0 1 1];\r\nassert(isequal(FillWithOnes(n,mat),ok))\r\n\r\n%%\r\nn=4;\r\nmat=[1 3; 3 2; 3 3];\r\nok = [0 0 1 0; 0 0 0 0; 0 1 1 0; 0 0 0 0];\r\nassert(isequal(FillWithOnes(n,mat),ok))","published":true,"deleted":false,"likes_count":8,"comments_count":1,"created_by":12767,"edited_by":null,"edited_at":null,"deleted_by":null,"deleted_at":null,"solvers_count":727,"test_suite_updated_at":null,"rescore_all_solutions":false,"group_id":13,"created_at":"2013-04-16T13:00:28.000Z","updated_at":"2026-05-18T19:54:46.000Z","published_at":"2013-04-16T13:00:28.000Z","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\u003eThe positions will be indicated by a z-by-2 matrix. Each row in this z-by-2 matrix will have the row and column in which a 1 has to be placed.\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\u003eExample:\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:rFonts w:cs=\\\"monospace\\\"/\u003e\u003c/w:rPr\u003e\u003cw:t\u003en=3;\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:rFonts w:cs=\\\"monospace\\\"/\u003e\u003c/w:rPr\u003e\u003cw:t\u003emat=[1 3; 2 1];\u003c/w:t\u003e\u003c/w:r\u003e\u003cw:r\u003e\u003cw:t\u003e --\u0026gt; We want A(1,3)=1 and A(2,1)=1\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:rFonts w:cs=\\\"monospace\\\"/\u003e\u003c/w:rPr\u003e\u003cw:t\u003eA = FillWithOnes(n,mat);\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:rFonts w:cs=\\\"monospace\\\"/\u003e\u003c/w:rPr\u003e\u003cw:t\u003eA=[0 0 1; 1 0 0; 0 0 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\"}]}"}],"problem_search":{"problems":[{"id":1430,"title":"Create an n-by-n null matrix and fill with ones certain positions","description":"The positions will be indicated by a z-by-2 matrix. Each row in this z-by-2 matrix will have the row and column in which a 1 has to be placed.\r\n\r\nExample:\r\n\r\n|n=3;|\r\n\r\n|mat=[1 3; 2 1];| --\u003e We want A(1,3)=1 and A(2,1)=1\r\n\r\n|A = FillWithOnes(n,mat);|\r\n\r\n|A=[0 0 1;\r\n    1 0 0;\r\n    0 0 0];|","description_html":"\u003cp\u003eThe positions will be indicated by a z-by-2 matrix. Each row in this z-by-2 matrix will have the row and column in which a 1 has to be placed.\u003c/p\u003e\u003cp\u003eExample:\u003c/p\u003e\u003cp\u003e\u003ctt\u003en=3;\u003c/tt\u003e\u003c/p\u003e\u003cp\u003e\u003ctt\u003emat=[1 3; 2 1];\u003c/tt\u003e --\u003e We want A(1,3)=1 and A(2,1)=1\u003c/p\u003e\u003cp\u003e\u003ctt\u003eA = FillWithOnes(n,mat);\u003c/tt\u003e\u003c/p\u003e\u003cp\u003e\u003ctt\u003eA=[0 0 1;\r\n    1 0 0;\r\n    0 0 0];\u003c/tt\u003e\u003c/p\u003e","function_template":"function A = FillWithOnes(n,mat)\r\n  A = zeros(n);\r\nend","test_suite":"%%\r\nn = 1;\r\nmat=[1 1];\r\nok = 1;\r\nassert(isequal(FillWithOnes(n,mat),ok))\r\n\r\n%%\r\nn = 2;\r\nmat=[1 2; 2 1];\r\nok = [0 1; 1 0];\r\nassert(isequal(FillWithOnes(n,mat),ok))\r\n\r\n%%\r\nn=3;\r\nmat=[1 3; 3 2; 3 3];\r\nok = [0 0 1; 0 0 0; 0 1 1];\r\nassert(isequal(FillWithOnes(n,mat),ok))\r\n\r\n%%\r\nn=4;\r\nmat=[1 3; 3 2; 3 3];\r\nok = [0 0 1 0; 0 0 0 0; 0 1 1 0; 0 0 0 0];\r\nassert(isequal(FillWithOnes(n,mat),ok))","published":true,"deleted":false,"likes_count":8,"comments_count":1,"created_by":12767,"edited_by":null,"edited_at":null,"deleted_by":null,"deleted_at":null,"solvers_count":727,"test_suite_updated_at":null,"rescore_all_solutions":false,"group_id":13,"created_at":"2013-04-16T13:00:28.000Z","updated_at":"2026-05-18T19:54:46.000Z","published_at":"2013-04-16T13:00:28.000Z","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\u003eThe positions will be indicated by a z-by-2 matrix. Each row in this z-by-2 matrix will have the row and column in which a 1 has to be placed.\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\u003eExample:\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:rFonts w:cs=\\\"monospace\\\"/\u003e\u003c/w:rPr\u003e\u003cw:t\u003en=3;\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:rFonts w:cs=\\\"monospace\\\"/\u003e\u003c/w:rPr\u003e\u003cw:t\u003emat=[1 3; 2 1];\u003c/w:t\u003e\u003c/w:r\u003e\u003cw:r\u003e\u003cw:t\u003e --\u0026gt; We want A(1,3)=1 and A(2,1)=1\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:rFonts w:cs=\\\"monospace\\\"/\u003e\u003c/w:rPr\u003e\u003cw:t\u003eA = FillWithOnes(n,mat);\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:rFonts w:cs=\\\"monospace\\\"/\u003e\u003c/w:rPr\u003e\u003cw:t\u003eA=[0 0 1; 1 0 0; 0 0 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\"}]}"}],"errors":[],"facets":[[{"value":"Indexing II","count":1,"selected":false}],[{"value":"medium","count":1,"selected":false}]],"term":"tag:\"fill\"","page":1,"per_page":50,"sort":"map(difficulty_value,0,0,999) asc"}}