{"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":2327,"title":"Test within tolerance","description":"Given a vector of experimental data, D, and a vector of truth data, T, return FALSE if any +/- errors (D-T) are outside a given (positive) tolerance, tol, and return TRUE if all are within tolerance.","description_html":"\u003cp\u003eGiven a vector of experimental data, D, and a vector of truth data, T, return FALSE if any +/- errors (D-T) are outside a given (positive) tolerance, tol, and return TRUE if all are within tolerance.\u003c/p\u003e","function_template":"function TF = testtolerance(D,T,tol)\r\n  TF = tol;\r\nend","test_suite":"%%\r\nD = [0 0 0 0 0];\r\nT = [0 0 0 0 0];\r\ntol = 0;\r\nTF_correct = true;\r\nassert(isequal(testtolerance(D,T,tol),TF_correct))\r\n\r\n%%\r\nD = [0 0 0 0 -.1];\r\nT = [0 0 0 0 0];\r\ntol = 0.001;\r\nTF_correct = false;\r\nassert(isequal(testtolerance(D,T,tol),TF_correct))\r\n\r\n%%\r\nD = [.1 0 0 0 0 0 -.1];\r\nT = [0 .2 .001 0 -.1 0 0];\r\ntol = .15;\r\nTF_correct = false;\r\nassert(isequal(testtolerance(D,T,tol),TF_correct))\r\n\r\n%%\r\nD = [.1 0 0 0 0 0 -.1];\r\nT = [0 .2 .001 0 -.1 0 0];\r\ntol = .25;\r\nTF_correct = true;\r\nassert(isequal(testtolerance(D,T,tol),TF_correct))\r\n\r\n%%\r\nD = [-.001 .2 .001 0 -.1 0 0 .1];\r\nT = [.023 .2 .001 0 -.1 0 0 -.3];\r\ntol = .25;\r\nTF_correct = false;\r\nassert(isequal(testtolerance(D,T,tol),TF_correct))","published":true,"deleted":false,"likes_count":2,"comments_count":1,"created_by":10139,"edited_by":null,"edited_at":null,"deleted_by":null,"deleted_at":null,"solvers_count":73,"test_suite_updated_at":null,"rescore_all_solutions":false,"group_id":1,"created_at":"2014-05-15T22:51:29.000Z","updated_at":"2026-02-16T16:33:13.000Z","published_at":"2014-05-15T22:51:29.000Z","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\u003eGiven a vector of experimental data, D, and a vector of truth data, T, return FALSE if any +/- errors (D-T) are outside a given (positive) tolerance, tol, and return TRUE if all are within tolerance.\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":42618,"title":"Is this function available?","description":"Sometimes it is difficult to remember which functions are not allowed on the Cody platform. Given a function as a string, return true if it is available on Cody and false otherwise.\r\n\r\nThe test suite will be updated periodically, so hard-coding the answers will eventually fail.\r\n\r\n*Examples*\r\n\r\n  isavailable('bsxfun') returns true\r\n\r\n  isavailable('pdist2') returns false","description_html":"\u003cp\u003eSometimes it is difficult to remember which functions are not allowed on the Cody platform. Given a function as a string, return true if it is available on Cody and false otherwise.\u003c/p\u003e\u003cp\u003eThe test suite will be updated periodically, so hard-coding the answers will eventually fail.\u003c/p\u003e\u003cp\u003e\u003cb\u003eExamples\u003c/b\u003e\u003c/p\u003e\u003cpre class=\"language-matlab\"\u003eisavailable('bsxfun') returns true\r\n\u003c/pre\u003e\u003cpre class=\"language-matlab\"\u003eisavailable('pdist2') returns false\r\n\u003c/pre\u003e","function_template":"function tf = isavailable(f)\r\n  tf = true;\r\nend","test_suite":"%%\r\nassert(isequal(isavailable('sum'),true))\r\n\r\n%%\r\nassert(isequal(isavailable('mean'),true))\r\n\r\n%%\r\nassert(isequal(isavailable('bsxfun'),true))\r\n\r\n%%\r\nassert(isequal(isavailable('pdist'),false))\r\n\r\n%%\r\nassert(isequal(isavailable('hankel'),true))\r\n\r\n%%\r\nassert(isequal(isavailable('std'),true))\r\n\r\n%%\r\nassert(isequal(isavailable('evalin'),false))\r\n\r\n%%\r\nassert(isequal(isavailable('toeplitz'),true))\r\n\r\n%%\r\nassert(isequal(isavailable('pdist2'),false))\r\n\r\n%%\r\nassert(isequal(isavailable('assignin'),false))\r\n\r\n%%\r\nassert(isequal(isavailable('cell2mat'),true))\r\n\r\n%%\r\nassert(isequal(isavailable('arrayfun'),true))\r\n\r\n%%\r\nassert(isequal(isavailable('cellstr'),true))\r\n\r\n%%\r\nassert(isequal(isavailable('imfindcircles'),false))\r\n\r\n%%\r\nassert(isequal(isavailable('imread'),true))\r\n\r\n%%\r\nassert(isequal(isavailable('plot'),true))\r\n\r\n%%\r\nassert(isequal(isavailable('ocr'),false))\r\n\r\n%%\r\nassert(isequal(isavailable('cellfun'),true))\r\n\r\n%%\r\nassert(isequal(isavailable('dec2bin'),true))\r\n\r\n%%\r\nassert(isequal(isavailable('eval'),false))\r\n\r\n%%\r\nassert(isequal(isavailable('randi'),true))\r\n\r\n%%\r\nassert(isequal(isavailable('rng'),true))\r\n\r\n%%\r\nassert(isequal(isavailable('fread'),true))\r\n\r\n%%\r\nassert(isequal(isavailable('houghlines'),false))\r\n\r\n%%\r\nassert(isequal(isavailable('kron'),true))","published":true,"deleted":false,"likes_count":1,"comments_count":10,"created_by":4793,"edited_by":null,"edited_at":null,"deleted_by":null,"deleted_at":null,"solvers_count":18,"test_suite_updated_at":"2015-09-18T20:36:50.000Z","rescore_all_solutions":true,"group_id":1,"created_at":"2015-09-18T20:33:30.000Z","updated_at":"2026-05-28T14:45:40.000Z","published_at":"2015-09-18T20:33:30.000Z","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\u003eSometimes it is difficult to remember which functions are not allowed on the Cody platform. Given a function as a string, return true if it is available on Cody and false otherwise.\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\u003eThe test suite will be updated periodically, so hard-coding the answers will eventually fail.\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\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[isavailable('bsxfun') returns true\\n\\nisavailable('pdist2') returns 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of truth data, T, return FALSE if any +/- errors (D-T) are outside a given (positive) tolerance, tol, and return TRUE if all are within tolerance.\u003c/p\u003e","function_template":"function TF = testtolerance(D,T,tol)\r\n  TF = tol;\r\nend","test_suite":"%%\r\nD = [0 0 0 0 0];\r\nT = [0 0 0 0 0];\r\ntol = 0;\r\nTF_correct = true;\r\nassert(isequal(testtolerance(D,T,tol),TF_correct))\r\n\r\n%%\r\nD = [0 0 0 0 -.1];\r\nT = [0 0 0 0 0];\r\ntol = 0.001;\r\nTF_correct = false;\r\nassert(isequal(testtolerance(D,T,tol),TF_correct))\r\n\r\n%%\r\nD = [.1 0 0 0 0 0 -.1];\r\nT = [0 .2 .001 0 -.1 0 0];\r\ntol = .15;\r\nTF_correct = false;\r\nassert(isequal(testtolerance(D,T,tol),TF_correct))\r\n\r\n%%\r\nD = [.1 0 0 0 0 0 -.1];\r\nT = [0 .2 .001 0 -.1 0 0];\r\ntol = .25;\r\nTF_correct = true;\r\nassert(isequal(testtolerance(D,T,tol),TF_correct))\r\n\r\n%%\r\nD = [-.001 .2 .001 0 -.1 0 0 .1];\r\nT = [.023 .2 .001 0 -.1 0 0 -.3];\r\ntol = .25;\r\nTF_correct = false;\r\nassert(isequal(testtolerance(D,T,tol),TF_correct))","published":true,"deleted":false,"likes_count":2,"comments_count":1,"created_by":10139,"edited_by":null,"edited_at":null,"deleted_by":null,"deleted_at":null,"solvers_count":73,"test_suite_updated_at":null,"rescore_all_solutions":false,"group_id":1,"created_at":"2014-05-15T22:51:29.000Z","updated_at":"2026-02-16T16:33:13.000Z","published_at":"2014-05-15T22:51:29.000Z","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\u003eGiven a vector of experimental data, D, and a vector of truth data, T, return FALSE if any +/- errors (D-T) are outside a given (positive) tolerance, tol, and return TRUE if all are within tolerance.\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 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Given a function as a string, return true if it is available on Cody and false otherwise.\r\n\r\nThe test suite will be updated periodically, so hard-coding the answers will eventually fail.\r\n\r\n*Examples*\r\n\r\n  isavailable('bsxfun') returns true\r\n\r\n  isavailable('pdist2') returns false","description_html":"\u003cp\u003eSometimes it is difficult to remember which functions are not allowed on the Cody platform. Given a function as a string, return true if it is available on Cody and false otherwise.\u003c/p\u003e\u003cp\u003eThe test suite will be updated periodically, so hard-coding the answers will eventually fail.\u003c/p\u003e\u003cp\u003e\u003cb\u003eExamples\u003c/b\u003e\u003c/p\u003e\u003cpre class=\"language-matlab\"\u003eisavailable('bsxfun') returns true\r\n\u003c/pre\u003e\u003cpre class=\"language-matlab\"\u003eisavailable('pdist2') returns false\r\n\u003c/pre\u003e","function_template":"function tf = isavailable(f)\r\n  tf = true;\r\nend","test_suite":"%%\r\nassert(isequal(isavailable('sum'),true))\r\n\r\n%%\r\nassert(isequal(isavailable('mean'),true))\r\n\r\n%%\r\nassert(isequal(isavailable('bsxfun'),true))\r\n\r\n%%\r\nassert(isequal(isavailable('pdist'),false))\r\n\r\n%%\r\nassert(isequal(isavailable('hankel'),true))\r\n\r\n%%\r\nassert(isequal(isavailable('std'),true))\r\n\r\n%%\r\nassert(isequal(isavailable('evalin'),false))\r\n\r\n%%\r\nassert(isequal(isavailable('toeplitz'),true))\r\n\r\n%%\r\nassert(isequal(isavailable('pdist2'),false))\r\n\r\n%%\r\nassert(isequal(isavailable('assignin'),false))\r\n\r\n%%\r\nassert(isequal(isavailable('cell2mat'),true))\r\n\r\n%%\r\nassert(isequal(isavailable('arrayfun'),true))\r\n\r\n%%\r\nassert(isequal(isavailable('cellstr'),true))\r\n\r\n%%\r\nassert(isequal(isavailable('imfindcircles'),false))\r\n\r\n%%\r\nassert(isequal(isavailable('imread'),true))\r\n\r\n%%\r\nassert(isequal(isavailable('plot'),true))\r\n\r\n%%\r\nassert(isequal(isavailable('ocr'),false))\r\n\r\n%%\r\nassert(isequal(isavailable('cellfun'),true))\r\n\r\n%%\r\nassert(isequal(isavailable('dec2bin'),true))\r\n\r\n%%\r\nassert(isequal(isavailable('eval'),false))\r\n\r\n%%\r\nassert(isequal(isavailable('randi'),true))\r\n\r\n%%\r\nassert(isequal(isavailable('rng'),true))\r\n\r\n%%\r\nassert(isequal(isavailable('fread'),true))\r\n\r\n%%\r\nassert(isequal(isavailable('houghlines'),false))\r\n\r\n%%\r\nassert(isequal(isavailable('kron'),true))","published":true,"deleted":false,"likes_count":1,"comments_count":10,"created_by":4793,"edited_by":null,"edited_at":null,"deleted_by":null,"deleted_at":null,"solvers_count":18,"test_suite_updated_at":"2015-09-18T20:36:50.000Z","rescore_all_solutions":true,"group_id":1,"created_at":"2015-09-18T20:33:30.000Z","updated_at":"2026-05-28T14:45:40.000Z","published_at":"2015-09-18T20:33:30.000Z","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\u003eSometimes it is difficult to remember which functions are not allowed on the Cody platform. Given a function as a string, return true if it is available on Cody and false otherwise.\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\u003eThe test suite will be updated periodically, so hard-coding the answers will eventually fail.\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\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[isavailable('bsxfun') returns true\\n\\nisavailable('pdist2') returns false]]\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":"easy","count":1,"selected":false},{"value":"medium","count":1,"selected":false}]],"term":"tag:\"error\"","page":1,"per_page":50,"sort":"map(difficulty_value,0,0,999) asc"}}