{"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":42461,"title":"This is a palindrome and so am I","description":"A palindrome is a sequence of characters which reads the same backward or forward, for instance\r\n\r\n'a man a plan a canal panama'\r\n\r\nis a palindrome.\r\nWrite a function that, \r\n\r\n*a)* given a string input, returns true or false depending on whether this string is a palindrome (up to white-spaces) or not.\r\n\r\n*b)* The function's source code must be a palindrome.","description_html":"\u003cp\u003eA palindrome is a sequence of characters which reads the same backward or forward, for instance\u003c/p\u003e\u003cp\u003e'a man a plan a canal panama'\u003c/p\u003e\u003cp\u003eis a palindrome.\r\nWrite a function that,\u003c/p\u003e\u003cp\u003e\u003cb\u003ea)\u003c/b\u003e given a string input, returns true or false depending on whether this string is a palindrome (up to white-spaces) or not.\u003c/p\u003e\u003cp\u003e\u003cb\u003eb)\u003c/b\u003e The function's source code must be a palindrome.\u003c/p\u003e","function_template":"function y = is_pal(s)\r\n% )s(lap_si = y noitcnuf\r\n","test_suite":"%%\r\ns = 'a man a plan a canal panama';\r\nassert(isequal(is_pal(s),true))\r\n%%\r\ns = 'taco cat';\r\nassert(isequal(is_pal(s),true))\r\n%%\r\ns = 'a man a plan  canal panama';\r\nassert(isequal(is_pal(s),false))\r\n%%\r\ns = char(randi(74,1,200)+'0');\r\nassert(isequal(is_pal(s),false)); % most probably\r\n%%\r\ns = char(randi(74,1,200)+'0');\r\ns = [s fliplr(s)];\r\nassert(isequal(is_pal(s),true));\r\n%%\r\ns = fileread('is_pal.m');\r\ns = regexprep(s,'%This code written by profile_id.*','')\r\nassert(isequal(is_pal(s),true));","published":true,"deleted":false,"likes_count":8,"comments_count":5,"created_by":203,"edited_by":null,"edited_at":null,"deleted_by":null,"deleted_at":null,"solvers_count":37,"test_suite_updated_at":null,"rescore_all_solutions":false,"group_id":1,"created_at":"2015-07-23T12:29:59.000Z","updated_at":"2026-05-28T13:39:12.000Z","published_at":"2015-07-23T12:30:16.000Z","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\",\"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\u003eA palindrome is a sequence of characters which reads the same backward or forward, for instance\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\u003e'a man a plan a canal panama'\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\u003eis a palindrome. Write a function that,\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:b/\u003e\u003c/w:rPr\u003e\u003cw:t\u003ea)\u003c/w:t\u003e\u003c/w:r\u003e\u003cw:r\u003e\u003cw:t\u003e given a string input, returns true or false depending on whether this string is a palindrome (up to white-spaces) or not.\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:b/\u003e\u003c/w:rPr\u003e\u003cw:t\u003eb)\u003c/w:t\u003e\u003c/w:r\u003e\u003cw:r\u003e\u003cw:t\u003e The function's source code must be a palindrome.\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":42461,"title":"This is a palindrome and so am I","description":"A palindrome is a sequence of characters which reads the same backward or forward, for instance\r\n\r\n'a man a plan a canal panama'\r\n\r\nis a palindrome.\r\nWrite a function that, \r\n\r\n*a)* given a string input, returns true or false depending on whether this string is a palindrome (up to white-spaces) or not.\r\n\r\n*b)* The function's source code must be a palindrome.","description_html":"\u003cp\u003eA palindrome is a sequence of characters which reads the same backward or forward, for instance\u003c/p\u003e\u003cp\u003e'a man a plan a canal panama'\u003c/p\u003e\u003cp\u003eis a palindrome.\r\nWrite a function that,\u003c/p\u003e\u003cp\u003e\u003cb\u003ea)\u003c/b\u003e given a string input, returns true or false depending on whether this string is a palindrome (up to white-spaces) or not.\u003c/p\u003e\u003cp\u003e\u003cb\u003eb)\u003c/b\u003e The function's source code must be a palindrome.\u003c/p\u003e","function_template":"function y = is_pal(s)\r\n% )s(lap_si = y noitcnuf\r\n","test_suite":"%%\r\ns = 'a man a plan a canal panama';\r\nassert(isequal(is_pal(s),true))\r\n%%\r\ns = 'taco cat';\r\nassert(isequal(is_pal(s),true))\r\n%%\r\ns = 'a man a plan  canal panama';\r\nassert(isequal(is_pal(s),false))\r\n%%\r\ns = char(randi(74,1,200)+'0');\r\nassert(isequal(is_pal(s),false)); % most probably\r\n%%\r\ns = char(randi(74,1,200)+'0');\r\ns = [s fliplr(s)];\r\nassert(isequal(is_pal(s),true));\r\n%%\r\ns = fileread('is_pal.m');\r\ns = regexprep(s,'%This code written by profile_id.*','')\r\nassert(isequal(is_pal(s),true));","published":true,"deleted":false,"likes_count":8,"comments_count":5,"created_by":203,"edited_by":null,"edited_at":null,"deleted_by":null,"deleted_at":null,"solvers_count":37,"test_suite_updated_at":null,"rescore_all_solutions":false,"group_id":1,"created_at":"2015-07-23T12:29:59.000Z","updated_at":"2026-05-28T13:39:12.000Z","published_at":"2015-07-23T12:30:16.000Z","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\",\"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\u003eA palindrome is a sequence of characters which reads the same backward or forward, for instance\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\u003e'a man a plan a canal panama'\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\u003eis a palindrome. Write a function that,\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:b/\u003e\u003c/w:rPr\u003e\u003cw:t\u003ea)\u003c/w:t\u003e\u003c/w:r\u003e\u003cw:r\u003e\u003cw:t\u003e given a string input, returns true or false depending on whether this string is a palindrome (up to white-spaces) or not.\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:b/\u003e\u003c/w:rPr\u003e\u003cw:t\u003eb)\u003c/w:t\u003e\u003c/w:r\u003e\u003cw:r\u003e\u003cw:t\u003e The function's source code must be a palindrome.\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:\"contrained writing\"","page":1,"per_page":50,"sort":"map(difficulty_value,0,0,999) asc"}}