{"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":44483,"title":"Separate even from odd numbers in a vector - without loops","description":"*Without using loops*, rearrange a vector of integers such that the odd numbers appear at the beginning, and even numbers at the end. The order within each group should be preserved.\r\n\r\nExamples:\r\n\r\n  Input:  v = [1, 0, 2, 9, 3, 8, 8, 4]\r\n  Output: w = [1, 9, 3, 0, 2, 8, 8, 4]\r\n\r\n  Input:  v = [2\r\n               7\r\n               0\r\n               3\r\n               2]\r\n\r\n  Output: w = [7\r\n               3\r\n               2\r\n               0\r\n               2]\r\n\r\n  Input:  v = []\r\n  Output: w = []\r\n","description_html":"\u003cp\u003e\u003cb\u003eWithout using loops\u003c/b\u003e, rearrange a vector of integers such that the odd numbers appear at the beginning, and even numbers at the end. The order within each group should be preserved.\u003c/p\u003e\u003cp\u003eExamples:\u003c/p\u003e\u003cpre class=\"language-matlab\"\u003eInput:  v = [1, 0, 2, 9, 3, 8, 8, 4]\r\nOutput: w = [1, 9, 3, 0, 2, 8, 8, 4]\r\n\u003c/pre\u003e\u003cpre class=\"language-matlab\"\u003eInput:  v = [2\r\n             7\r\n             0\r\n             3\r\n             2]\r\n\u003c/pre\u003e\u003cpre class=\"language-matlab\"\u003eOutput: w = [7\r\n             3\r\n             2\r\n             0\r\n             2]\r\n\u003c/pre\u003e\u003cpre class=\"language-matlab\"\u003eInput:  v = []\r\nOutput: w = []\r\n\u003c/pre\u003e","function_template":"function w = oddEven(v)\r\n    w = v;\r\nend","test_suite":"%%\r\nfiletext = fileread('oddEven.m');\r\nassert(isempty(strfind(filetext, 'regexp')),'regexp hacks are forbidden')\r\n\r\n%%\r\nfiletext = fileread('oddEven.m');\r\nloopUsed = any(strfind(filetext, 'while')) || any(strfind(filetext, 'for'));\r\nassert(~loopUsed, 'Loops are forbidden')\r\n\r\n%%\r\nv = [];\r\nw_correct = [];\r\nassert(isequal(oddEven(v),w_correct))\r\n\r\n%%\r\nv = [2; 7; 0; 3; 2];\r\nw_correct = [7; 3; 2; 0; 2];\r\nassert(isequal(oddEven(v),w_correct))\r\n\r\n%%\r\nv = [1, 0, 2, 9, 3, 8, 8, 4];\r\nw_correct = [1, 9, 3, 0, 2, 8, 8, 4];\r\nassert(isequal(oddEven(v),w_correct))\r\n\r\n%%\r\nodd  = 2 * randi([-4, 4], 1, randi([4,10])) - 1;\r\neven = 2 * randi([-4, 4], 1, randi([4,10]));\r\nv = [even, odd];\r\nw_correct = [odd, even];\r\nassert(isequal(oddEven(v),w_correct))\r\n","published":true,"deleted":false,"likes_count":1,"comments_count":1,"created_by":140356,"edited_by":null,"edited_at":null,"deleted_by":null,"deleted_at":null,"solvers_count":393,"test_suite_updated_at":"2018-01-07T23:06:48.000Z","rescore_all_solutions":false,"group_id":1,"created_at":"2018-01-07T11:53:55.000Z","updated_at":"2026-05-29T05:06:28.000Z","published_at":"2018-01-07T11:53:55.000Z","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:rPr\u003e\u003cw:b/\u003e\u003c/w:rPr\u003e\u003cw:t\u003eWithout using loops\u003c/w:t\u003e\u003c/w:r\u003e\u003cw:r\u003e\u003cw:t\u003e, rearrange a vector of integers such that the odd numbers appear at the beginning, and even numbers at the end. The order within each group should be preserved.\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\u003eExamples:\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[Input:  v = [1, 0, 2, 9, 3, 8, 8, 4]\\nOutput: w = [1, 9, 3, 0, 2, 8, 8, 4]\\n\\nInput:  v = [2\\n             7\\n             0\\n             3\\n             2]\\n\\nOutput: w = [7\\n             3\\n             2\\n             0\\n             2]\\n\\nInput:  v = []\\nOutput: w = []]]\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":{"problems":[{"id":44483,"title":"Separate even from odd numbers in a vector - without loops","description":"*Without using loops*, rearrange a vector of integers such that the odd numbers appear at the beginning, and even numbers at the end. The order within each group should be preserved.\r\n\r\nExamples:\r\n\r\n  Input:  v = [1, 0, 2, 9, 3, 8, 8, 4]\r\n  Output: w = [1, 9, 3, 0, 2, 8, 8, 4]\r\n\r\n  Input:  v = [2\r\n               7\r\n               0\r\n               3\r\n               2]\r\n\r\n  Output: w = [7\r\n               3\r\n               2\r\n               0\r\n               2]\r\n\r\n  Input:  v = []\r\n  Output: w = []\r\n","description_html":"\u003cp\u003e\u003cb\u003eWithout using loops\u003c/b\u003e, rearrange a vector of integers such that the odd numbers appear at the beginning, and even numbers at the end. The order within each group should be preserved.\u003c/p\u003e\u003cp\u003eExamples:\u003c/p\u003e\u003cpre class=\"language-matlab\"\u003eInput:  v = [1, 0, 2, 9, 3, 8, 8, 4]\r\nOutput: w = [1, 9, 3, 0, 2, 8, 8, 4]\r\n\u003c/pre\u003e\u003cpre class=\"language-matlab\"\u003eInput:  v = [2\r\n             7\r\n             0\r\n             3\r\n             2]\r\n\u003c/pre\u003e\u003cpre class=\"language-matlab\"\u003eOutput: w = [7\r\n             3\r\n             2\r\n             0\r\n             2]\r\n\u003c/pre\u003e\u003cpre class=\"language-matlab\"\u003eInput:  v = []\r\nOutput: w = []\r\n\u003c/pre\u003e","function_template":"function w = oddEven(v)\r\n    w = v;\r\nend","test_suite":"%%\r\nfiletext = fileread('oddEven.m');\r\nassert(isempty(strfind(filetext, 'regexp')),'regexp hacks are forbidden')\r\n\r\n%%\r\nfiletext = fileread('oddEven.m');\r\nloopUsed = any(strfind(filetext, 'while')) || any(strfind(filetext, 'for'));\r\nassert(~loopUsed, 'Loops are forbidden')\r\n\r\n%%\r\nv = [];\r\nw_correct = [];\r\nassert(isequal(oddEven(v),w_correct))\r\n\r\n%%\r\nv = [2; 7; 0; 3; 2];\r\nw_correct = [7; 3; 2; 0; 2];\r\nassert(isequal(oddEven(v),w_correct))\r\n\r\n%%\r\nv = [1, 0, 2, 9, 3, 8, 8, 4];\r\nw_correct = [1, 9, 3, 0, 2, 8, 8, 4];\r\nassert(isequal(oddEven(v),w_correct))\r\n\r\n%%\r\nodd  = 2 * randi([-4, 4], 1, randi([4,10])) - 1;\r\neven = 2 * randi([-4, 4], 1, randi([4,10]));\r\nv = [even, odd];\r\nw_correct = [odd, even];\r\nassert(isequal(oddEven(v),w_correct))\r\n","published":true,"deleted":false,"likes_count":1,"comments_count":1,"created_by":140356,"edited_by":null,"edited_at":null,"deleted_by":null,"deleted_at":null,"solvers_count":393,"test_suite_updated_at":"2018-01-07T23:06:48.000Z","rescore_all_solutions":false,"group_id":1,"created_at":"2018-01-07T11:53:55.000Z","updated_at":"2026-05-29T05:06:28.000Z","published_at":"2018-01-07T11:53:55.000Z","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:rPr\u003e\u003cw:b/\u003e\u003c/w:rPr\u003e\u003cw:t\u003eWithout using loops\u003c/w:t\u003e\u003c/w:r\u003e\u003cw:r\u003e\u003cw:t\u003e, rearrange a vector of integers such that the odd numbers appear at the beginning, and even numbers at the end. The order within each group should be preserved.\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\u003eExamples:\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[Input:  v = [1, 0, 2, 9, 3, 8, 8, 4]\\nOutput: w = [1, 9, 3, 0, 2, 8, 8, 4]\\n\\nInput:  v = [2\\n             7\\n             0\\n             3\\n             2]\\n\\nOutput: w = [7\\n             3\\n             2\\n             0\\n             2]\\n\\nInput:  v = []\\nOutput: w = []]]\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\"}]}"}],"errors":[],"facets":[[],[{"value":"medium","count":1,"selected":false}]],"term":"tag:\"logical indices\"","page":1,"per_page":50,"sort":"map(difficulty_value,0,0,999) asc"}}