{"group":{"id":1,"name":"Community","lockable":false,"created_at":"2012-01-18T18:02:15.000Z","updated_at":"2026-05-26T00:16:20.000Z","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":"2026-05-26T00:00:00.000Z","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":43177,"title":"Extract a specific part of matrix!","description":"In the given matrix, extract element that have odd rows and column number.\r\n\r\nFor example\r\n\r\n  A=[1 4 2 3 5]\r\n  B=extractodd(A);\r\n\r\nB should be\r\n\r\n  [1 2 5]\r\n\r\nAnd, if A is\r\n\r\n  [1 2 3\r\n   4 5 6\r\n   7 8 9]\r\n\r\nB should be\r\n\r\n  [1 3\r\n   7 9]","description_html":"\u003cp\u003eIn the given matrix, extract element that have odd rows and column number.\u003c/p\u003e\u003cp\u003eFor example\u003c/p\u003e\u003cpre class=\"language-matlab\"\u003eA=[1 4 2 3 5]\r\nB=extractodd(A);\r\n\u003c/pre\u003e\u003cp\u003eB should be\u003c/p\u003e\u003cpre class=\"language-matlab\"\u003e[1 2 5]\r\n\u003c/pre\u003e\u003cp\u003eAnd, if A is\u003c/p\u003e\u003cpre class=\"language-matlab\"\u003e[1 2 3\r\n 4 5 6\r\n 7 8 9]\r\n\u003c/pre\u003e\u003cp\u003eB should be\u003c/p\u003e\u003cpre class=\"language-matlab\"\u003e[1 3\r\n 7 9]\r\n\u003c/pre\u003e","function_template":"function y = extractodd(x)\r\n    y=\r\nend","test_suite":"%%\r\n  x=[1 2 3;\r\n     4 5 6;\r\n     7 8 9]\r\ny_correct = [1 3;7 9]\r\nassert(isequal(extractodd(x),y_correct))\r\n\r\n%%\r\n  x=[1 3 5 7 9]\r\ny_correct = [1 5 9]\r\nassert(isequal(extractodd(x),y_correct))\r\n","published":true,"deleted":false,"likes_count":6,"comments_count":0,"created_by":33533,"edited_by":null,"edited_at":null,"deleted_by":null,"deleted_at":null,"solvers_count":83,"test_suite_updated_at":"2016-10-25T04:38:05.000Z","rescore_all_solutions":false,"group_id":1,"created_at":"2016-10-07T18:38:10.000Z","updated_at":"2026-03-23T04:56:58.000Z","published_at":"2016-10-07T18:38:10.000Z","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 the given matrix, extract element that have odd rows and column number.\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\u003eFor 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 4 2 3 5]\\nB=extractodd(A);]]\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\u003eB should 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7 9]","description_html":"\u003cp\u003eIn the given matrix, extract element that have odd rows and column number.\u003c/p\u003e\u003cp\u003eFor example\u003c/p\u003e\u003cpre class=\"language-matlab\"\u003eA=[1 4 2 3 5]\r\nB=extractodd(A);\r\n\u003c/pre\u003e\u003cp\u003eB should be\u003c/p\u003e\u003cpre class=\"language-matlab\"\u003e[1 2 5]\r\n\u003c/pre\u003e\u003cp\u003eAnd, if A is\u003c/p\u003e\u003cpre class=\"language-matlab\"\u003e[1 2 3\r\n 4 5 6\r\n 7 8 9]\r\n\u003c/pre\u003e\u003cp\u003eB should be\u003c/p\u003e\u003cpre class=\"language-matlab\"\u003e[1 3\r\n 7 9]\r\n\u003c/pre\u003e","function_template":"function y = extractodd(x)\r\n    y=\r\nend","test_suite":"%%\r\n  x=[1 2 3;\r\n     4 5 6;\r\n     7 8 9]\r\ny_correct = [1 3;7 9]\r\nassert(isequal(extractodd(x),y_correct))\r\n\r\n%%\r\n  x=[1 3 5 7 9]\r\ny_correct = [1 5 9]\r\nassert(isequal(extractodd(x),y_correct))\r\n","published":true,"deleted":false,"likes_count":6,"comments_count":0,"created_by":33533,"edited_by":null,"edited_at":null,"deleted_by":null,"deleted_at":null,"solvers_count":83,"test_suite_updated_at":"2016-10-25T04:38:05.000Z","rescore_all_solutions":false,"group_id":1,"created_at":"2016-10-07T18:38:10.000Z","updated_at":"2026-03-23T04:56:58.000Z","published_at":"2016-10-07T18:38:10.000Z","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 the given matrix, extract element that have odd rows and column number.\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\u003eFor 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 4 2 3 5]\\nB=extractodd(A);]]\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\u003eB should 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