{"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":42590,"title":"Divide elements by sum of elements","description":"In this problem, I ask you to write a function which will divide the elements of each column by the sum of the elements of the same column.\r\n\r\nResults should have 2 significant digits.\r\n\r\nYou cannot use for/while loops.","description_html":"\u003cp\u003eIn this problem, I ask you to write a function which will divide the elements of each column by the sum of the elements of the same column.\u003c/p\u003e\u003cp\u003eResults should have 2 significant digits.\u003c/p\u003e\u003cp\u003eYou cannot use for/while loops.\u003c/p\u003e","function_template":"function y = divideElements(x)\r\n  y = x;\r\nend","test_suite":"%%\r\nfiletext = fileread('divideElements.m');\r\nassert(isempty(strfind(filetext, 'for')))\r\nassert(isempty(strfind(filetext, 'while')))\r\n\r\n%%\r\nx = magic(3);\r\ny_correct = [0.53 0.07 0.4;\r\n0.20 0.33 0.47;\r\n0.27 0.60 0.13];\r\nassert(isequal(divideElements(x),y_correct))\r\n\r\n%%\r\nx = magic(4);\r\ny_correct = [0.47\t0.06\t0.09\t0.38\r\n0.15\t0.32\t0.29\t0.24\r\n0.26\t0.21\t0.18\t0.35\r\n0.12\t0.41\t0.44\t0.03];\r\nassert(isequal(divideElements(x),y_correct))\r\n\r\n%%\r\nx = ones(2);\r\ny_correct = repmat(0.5,2,2);\r\nassert(isequal(divideElements(x),y_correct))\r\n\r\n%%\r\nx = [1 0.5; 2 1];\r\ny_correct = [0.33 0.33; 0.67 0.67];\r\nassert(isequal(divideElements(x),y_correct))","published":true,"deleted":false,"likes_count":2,"comments_count":3,"created_by":8703,"edited_by":null,"edited_at":null,"deleted_by":null,"deleted_at":null,"solvers_count":142,"test_suite_updated_at":"2015-09-09T15:27:51.000Z","rescore_all_solutions":false,"group_id":24,"created_at":"2015-09-09T14:33:16.000Z","updated_at":"2026-04-02T10:12:10.000Z","published_at":"2015-09-09T14:33:16.000Z","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\u003eIn this problem, I ask you to write a function which will divide the elements of each column by the sum of the elements of the same column.\u003c/w:t\u003e\u003c/w:r\u003e\u003c/w:p\u003e\u003cw:p\u003e\u003cw:pPr\u003e\u003cw:pStyle w:val=\\\"text\\\"/\u003e\u003cw:jc w:val=\\\"left\\\"/\u003e\u003c/w:pPr\u003e\u003cw:r\u003e\u003cw:t\u003eResults should have 2 significant digits.\u003c/w:t\u003e\u003c/w:r\u003e\u003c/w:p\u003e\u003cw:p\u003e\u003cw:pPr\u003e\u003cw:pStyle w:val=\\\"text\\\"/\u003e\u003cw:jc w:val=\\\"left\\\"/\u003e\u003c/w:pPr\u003e\u003cw:r\u003e\u003cw:t\u003eYou cannot use for/while loops.\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":42695,"title":"Replace secondary diagonal elements of a square array","description":"Replace all the secondary diagonal elements of the square array A with the number n\r\n\r\nExample:\r\n\r\n A = [1 2 3\r\n      4 5 6\r\n      7 8 9]\r\n n=0\r\n\r\n Output = [1 2 0\r\n           4 0 6\r\n           0 8 9]\r\n\r\nExample 2\r\n\r\n A = 1;\r\n n = 10;\r\n\r\n Output = 10\r\n","description_html":"\u003cp\u003eReplace all the secondary diagonal elements of the square array A with the number n\u003c/p\u003e\u003cp\u003eExample:\u003c/p\u003e\u003cpre\u003e A = [1 2 3\r\n      4 5 6\r\n      7 8 9]\r\n n=0\u003c/pre\u003e\u003cpre\u003e Output = [1 2 0\r\n           4 0 6\r\n           0 8 9]\u003c/pre\u003e\u003cp\u003eExample 2\u003c/p\u003e\u003cpre\u003e A = 1;\r\n n = 10;\u003c/pre\u003e\u003cpre\u003e Output = 10\u003c/pre\u003e","function_template":"function B = sec_diag_replacement(A,n)\r\n  B = A;\r\nend","test_suite":"%%\r\nA = [1 2 3; 4 5 6; 7 8 9];\r\nn = 10;\r\nB_correct = [1 2 10; 4 10 6; 10 8 9];\r\nassert(isequal(sec_diag_replacement(A,n),B_correct))\r\n\r\n%%\r\nA = 1;\r\nn = 10;\r\nB_correct = 10;\r\nassert(isequal(sec_diag_replacement(A,n),B_correct))\r\n\r\n%%\r\nA = ones(4);\r\nn = 0;\r\nB_correct = [1 1 1 0; 1 1 0 1; 1 0 1 1; 0 1 1 1];\r\nassert(isequal(sec_diag_replacement(A,n),B_correct))\r\n\r\n%%\r\nA = eye(4);\r\nn = 10;\r\nB_correct = [1 0 0 10; 0 1 10 0; 0 10 1 0; 10 0 0 1];\r\nassert(isequal(sec_diag_replacement(A,n),B_correct))\r\n\r\n%%\r\nA = [1 1 2 1; 1 2 1 1; 2 1 1 1; 1 1 1 2];\r\nn = 3;\r\nB_correct = [1 1 2 3; 1 2 3 1; 2 3 1 1; 3 1 1 2];\r\nassert(isequal(sec_diag_replacement(A,n),B_correct))\r\n\r\n%%\r\nA = zeros(3);\r\nn = -1;\r\nB_correct = [0 0 -1; 0 -1 0; -1 0 0];\r\nassert(isequal(sec_diag_replacement(A,n),B_correct))\r\n","published":true,"deleted":false,"likes_count":2,"comments_count":1,"created_by":4907,"edited_by":null,"edited_at":null,"deleted_by":null,"deleted_at":null,"solvers_count":186,"test_suite_updated_at":"2017-04-19T16:58:30.000Z","rescore_all_solutions":false,"group_id":24,"created_at":"2015-12-17T05:29:44.000Z","updated_at":"2026-04-02T14:42:30.000Z","published_at":"2015-12-17T05:32:13.000Z","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\u003eReplace all the secondary diagonal elements of the square array A with the number n\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=\\\"code\\\"/\u003e\u003c/w:pPr\u003e\u003cw:r\u003e\u003cw:t\u003e\u003c![CDATA[ A = [1 2 3\\n      4 5 6\\n      7 8 9]\\n n=0\\n\\n Output = [1 2 0\\n           4 0 6\\n           0 8 9]]]\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\u003eExample 2\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;\\n n = 10;\\n\\n Output = 10]]\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":43609,"title":"Sort rows of a matrix","description":"Sort rows of matrix A in an ascending order according to the last column\r\n\r\nExample input:\r\n\r\n  A = [1 2 3;7 8 9;4 5 6];\r\n\r\nExample output:\r\n\r\n  A = [1 2 3;4 5 6;7 8 9];\r\n","description_html":"\u003cp\u003eSort rows of matrix A in an ascending order according to the last column\u003c/p\u003e\u003cp\u003eExample input:\u003c/p\u003e\u003cpre class=\"language-matlab\"\u003eA = [1 2 3;7 8 9;4 5 6];\r\n\u003c/pre\u003e\u003cp\u003eExample output:\u003c/p\u003e\u003cpre class=\"language-matlab\"\u003eA = [1 2 3;4 5 6;7 8 9];\r\n\u003c/pre\u003e","function_template":"function y = your_fcn_name(A)\r\n y = ?;\r\nend","test_suite":"%%\r\nA = magic(5);\r\ny_correct = [10 12 19 21  3;\r\n             11 18 25  2  9;\r\n             17 24  1  8 15;\r\n             23  5  7 14 16;\r\n              4  6 13 20 22];\r\nassert(isequal(your_fcn_name(A),y_correct))\r\n\r\n%%\r\nA = 1:5;\r\ny_correct = A;\r\nassert(isequal(your_fcn_name(A),y_correct))\r\n\r\n%%\r\nA = [1:4; 9:12; 13:16; 5:8];\r\ny_correct = reshape((1:16),[4,4])';\r\nassert(isequal(your_fcn_name(A),y_correct))\r\n\r\n%%\r\nA = (1:10)';\r\ny_correct = A;\r\nind = rand(10,1); [~,indA] = sort(ind); A = A(indA);\r\nassert(isequal(your_fcn_name(A),y_correct))\r\n\r\n%%\r\nA = [3:7; 10:-1:6; -4:0; 2:-1:-2];\r\ny_correct = flipud(A);\r\nassert(isequal(your_fcn_name(A),y_correct))\r\n","published":true,"deleted":false,"likes_count":1,"comments_count":1,"created_by":29461,"edited_by":null,"edited_at":null,"deleted_by":null,"deleted_at":null,"solvers_count":97,"test_suite_updated_at":"2016-12-05T18:47:25.000Z","rescore_all_solutions":false,"group_id":24,"created_at":"2016-10-24T15:59:33.000Z","updated_at":"2026-04-01T07:37:12.000Z","published_at":"2016-10-24T15:59:33.000Z","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\u003eSort rows of matrix A in an ascending order according to the last column\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 input:\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 2 3;7 8 9;4 5 6];]]\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\u003eExample output:\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 2 3;4 5 6;7 8 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\"}]}"}],"problem_search":{"errors":[],"problems":[{"id":42590,"title":"Divide elements by sum of elements","description":"In this problem, I ask you to write a function which will divide the elements of each column by the sum of the elements of the same column.\r\n\r\nResults should have 2 significant digits.\r\n\r\nYou cannot use for/while loops.","description_html":"\u003cp\u003eIn this problem, I ask you to write a function which will divide the elements of each column by the sum of the elements of the same column.\u003c/p\u003e\u003cp\u003eResults should have 2 significant digits.\u003c/p\u003e\u003cp\u003eYou cannot use for/while loops.\u003c/p\u003e","function_template":"function y = divideElements(x)\r\n  y = x;\r\nend","test_suite":"%%\r\nfiletext = fileread('divideElements.m');\r\nassert(isempty(strfind(filetext, 'for')))\r\nassert(isempty(strfind(filetext, 'while')))\r\n\r\n%%\r\nx = magic(3);\r\ny_correct = [0.53 0.07 0.4;\r\n0.20 0.33 0.47;\r\n0.27 0.60 0.13];\r\nassert(isequal(divideElements(x),y_correct))\r\n\r\n%%\r\nx = magic(4);\r\ny_correct = [0.47\t0.06\t0.09\t0.38\r\n0.15\t0.32\t0.29\t0.24\r\n0.26\t0.21\t0.18\t0.35\r\n0.12\t0.41\t0.44\t0.03];\r\nassert(isequal(divideElements(x),y_correct))\r\n\r\n%%\r\nx = ones(2);\r\ny_correct = repmat(0.5,2,2);\r\nassert(isequal(divideElements(x),y_correct))\r\n\r\n%%\r\nx = [1 0.5; 2 1];\r\ny_correct = [0.33 0.33; 0.67 0.67];\r\nassert(isequal(divideElements(x),y_correct))","published":true,"deleted":false,"likes_count":2,"comments_count":3,"created_by":8703,"edited_by":null,"edited_at":null,"deleted_by":null,"deleted_at":null,"solvers_count":142,"test_suite_updated_at":"2015-09-09T15:27:51.000Z","rescore_all_solutions":false,"group_id":24,"created_at":"2015-09-09T14:33:16.000Z","updated_at":"2026-04-02T10:12:10.000Z","published_at":"2015-09-09T14:33:16.000Z","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\u003eIn this problem, I ask you to write a function which will divide the elements of each column by the sum of the elements of the same column.\u003c/w:t\u003e\u003c/w:r\u003e\u003c/w:p\u003e\u003cw:p\u003e\u003cw:pPr\u003e\u003cw:pStyle w:val=\\\"text\\\"/\u003e\u003cw:jc w:val=\\\"left\\\"/\u003e\u003c/w:pPr\u003e\u003cw:r\u003e\u003cw:t\u003eResults should have 2 significant digits.\u003c/w:t\u003e\u003c/w:r\u003e\u003c/w:p\u003e\u003cw:p\u003e\u003cw:pPr\u003e\u003cw:pStyle w:val=\\\"text\\\"/\u003e\u003cw:jc w:val=\\\"left\\\"/\u003e\u003c/w:pPr\u003e\u003cw:r\u003e\u003cw:t\u003eYou cannot use for/while loops.\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":42695,"title":"Replace secondary diagonal elements of a square array","description":"Replace all the secondary diagonal elements of the square array A with the number n\r\n\r\nExample:\r\n\r\n A = [1 2 3\r\n      4 5 6\r\n      7 8 9]\r\n n=0\r\n\r\n Output = [1 2 0\r\n           4 0 6\r\n           0 8 9]\r\n\r\nExample 2\r\n\r\n A = 1;\r\n n = 10;\r\n\r\n Output = 10\r\n","description_html":"\u003cp\u003eReplace all the secondary diagonal elements of the square array A with the number n\u003c/p\u003e\u003cp\u003eExample:\u003c/p\u003e\u003cpre\u003e A = [1 2 3\r\n      4 5 6\r\n      7 8 9]\r\n n=0\u003c/pre\u003e\u003cpre\u003e Output = [1 2 0\r\n           4 0 6\r\n           0 8 9]\u003c/pre\u003e\u003cp\u003eExample 2\u003c/p\u003e\u003cpre\u003e A = 1;\r\n n = 10;\u003c/pre\u003e\u003cpre\u003e Output = 10\u003c/pre\u003e","function_template":"function B = sec_diag_replacement(A,n)\r\n  B = A;\r\nend","test_suite":"%%\r\nA = [1 2 3; 4 5 6; 7 8 9];\r\nn = 10;\r\nB_correct = [1 2 10; 4 10 6; 10 8 9];\r\nassert(isequal(sec_diag_replacement(A,n),B_correct))\r\n\r\n%%\r\nA = 1;\r\nn = 10;\r\nB_correct = 10;\r\nassert(isequal(sec_diag_replacement(A,n),B_correct))\r\n\r\n%%\r\nA = ones(4);\r\nn = 0;\r\nB_correct = [1 1 1 0; 1 1 0 1; 1 0 1 1; 0 1 1 1];\r\nassert(isequal(sec_diag_replacement(A,n),B_correct))\r\n\r\n%%\r\nA = eye(4);\r\nn = 10;\r\nB_correct = [1 0 0 10; 0 1 10 0; 0 10 1 0; 10 0 0 1];\r\nassert(isequal(sec_diag_replacement(A,n),B_correct))\r\n\r\n%%\r\nA = [1 1 2 1; 1 2 1 1; 2 1 1 1; 1 1 1 2];\r\nn = 3;\r\nB_correct = [1 1 2 3; 1 2 3 1; 2 3 1 1; 3 1 1 2];\r\nassert(isequal(sec_diag_replacement(A,n),B_correct))\r\n\r\n%%\r\nA = zeros(3);\r\nn = -1;\r\nB_correct = [0 0 -1; 0 -1 0; -1 0 0];\r\nassert(isequal(sec_diag_replacement(A,n),B_correct))\r\n","published":true,"deleted":false,"likes_count":2,"comments_count":1,"created_by":4907,"edited_by":null,"edited_at":null,"deleted_by":null,"deleted_at":null,"solvers_count":186,"test_suite_updated_at":"2017-04-19T16:58:30.000Z","rescore_all_solutions":false,"group_id":24,"created_at":"2015-12-17T05:29:44.000Z","updated_at":"2026-04-02T14:42:30.000Z","published_at":"2015-12-17T05:32:13.000Z","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\u003eReplace all the secondary diagonal elements of the square array A with the number n\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=\\\"code\\\"/\u003e\u003c/w:pPr\u003e\u003cw:r\u003e\u003cw:t\u003e\u003c![CDATA[ A = [1 2 3\\n      4 5 6\\n      7 8 9]\\n n=0\\n\\n Output = [1 2 0\\n           4 0 6\\n           0 8 9]]]\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\u003eExample 2\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;\\n n = 10;\\n\\n Output = 10]]\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":43609,"title":"Sort rows of a matrix","description":"Sort rows of matrix A in an ascending order according to the last column\r\n\r\nExample input:\r\n\r\n  A = [1 2 3;7 8 9;4 5 6];\r\n\r\nExample output:\r\n\r\n  A = [1 2 3;4 5 6;7 8 9];\r\n","description_html":"\u003cp\u003eSort rows of matrix A in an ascending order according to the last column\u003c/p\u003e\u003cp\u003eExample input:\u003c/p\u003e\u003cpre class=\"language-matlab\"\u003eA = [1 2 3;7 8 9;4 5 6];\r\n\u003c/pre\u003e\u003cp\u003eExample output:\u003c/p\u003e\u003cpre class=\"language-matlab\"\u003eA = [1 2 3;4 5 6;7 8 9];\r\n\u003c/pre\u003e","function_template":"function y = your_fcn_name(A)\r\n y = ?;\r\nend","test_suite":"%%\r\nA = magic(5);\r\ny_correct = [10 12 19 21  3;\r\n             11 18 25  2  9;\r\n             17 24  1  8 15;\r\n             23  5  7 14 16;\r\n              4  6 13 20 22];\r\nassert(isequal(your_fcn_name(A),y_correct))\r\n\r\n%%\r\nA = 1:5;\r\ny_correct = A;\r\nassert(isequal(your_fcn_name(A),y_correct))\r\n\r\n%%\r\nA = [1:4; 9:12; 13:16; 5:8];\r\ny_correct = 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flipud(A);\r\nassert(isequal(your_fcn_name(A),y_correct))\r\n","published":true,"deleted":false,"likes_count":1,"comments_count":1,"created_by":29461,"edited_by":null,"edited_at":null,"deleted_by":null,"deleted_at":null,"solvers_count":97,"test_suite_updated_at":"2016-12-05T18:47:25.000Z","rescore_all_solutions":false,"group_id":24,"created_at":"2016-10-24T15:59:33.000Z","updated_at":"2026-04-01T07:37:12.000Z","published_at":"2016-10-24T15:59:33.000Z","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\u003eSort rows of matrix A in an ascending order according to the last column\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 input:\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 2 3;7 8 9;4 5 6];]]\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\u003eExample 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