{"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":44437,"title":"How many days in a month?","description":"Return the number of days in a given month in 2017. If the input is not a valid month number, return -1.\r\n\r\nExamples:\r\n\r\n  Input: m = 1\r\n  Outpu: d = 31\r\n\r\n  Input:  m = 2\r\n  Output: d = 28\r\n\r\n  Input:  m = 13\r\n  Output: d = -1\r\n\r\nYou *cannot* use IF statements","description_html":"\u003cp\u003eReturn the number of days in a given month in 2017. If the input is not a valid month number, return -1.\u003c/p\u003e\u003cp\u003eExamples:\u003c/p\u003e\u003cpre class=\"language-matlab\"\u003eInput: m = 1\r\nOutpu: d = 31\r\n\u003c/pre\u003e\u003cpre class=\"language-matlab\"\u003eInput:  m = 2\r\nOutput: d = 28\r\n\u003c/pre\u003e\u003cpre class=\"language-matlab\"\u003eInput:  m = 13\r\nOutput: d = -1\r\n\u003c/pre\u003e\u003cp\u003eYou \u003cb\u003ecannot\u003c/b\u003e use IF statements\u003c/p\u003e","function_template":"function d = daysInMonth(m)\r\n  d = 31;\r\nend","test_suite":"%%\r\nfiletext = fileread('daysInMonth.m');\r\nassert(isempty(strfind(filetext, 'regexp')),'regexp hacks are forbidden')\r\nassert(isempty(strfind(filetext, 'if')),'IF statements are forbidden')\r\n\r\n%%\r\nm = 1;\r\nd_correct = 31;\r\nassert(isequal(daysInMonth(m),d_correct))\r\n\r\n%%\r\nm = 2;\r\nd_correct = 28;\r\nassert(isequal(daysInMonth(m),d_correct))\r\n\r\n%%\r\nm = 3;\r\nd_correct = 31;\r\nassert(isequal(daysInMonth(m),d_correct))\r\n\r\n%%\r\nm = 4;\r\nd_correct = 30;\r\nassert(isequal(daysInMonth(m),d_correct))\r\n\r\n%%\r\nm = 5;\r\nd_correct = 31;\r\nassert(isequal(daysInMonth(m),d_correct))\r\n\r\n%%\r\nm = 6;\r\nd_correct = 30;\r\nassert(isequal(daysInMonth(m),d_correct))\r\n\r\n%%\r\nm = 7;\r\nd_correct = 31;\r\nassert(isequal(daysInMonth(m),d_correct))\r\n\r\n%%\r\nm = 8;\r\nd_correct = 31;\r\nassert(isequal(daysInMonth(m),d_correct))\r\n\r\n%%\r\nm = 9;\r\nd_correct = 30;\r\nassert(isequal(daysInMonth(m),d_correct))\r\n\r\n%%\r\nm = 10;\r\nd_correct = 31;\r\nassert(isequal(daysInMonth(m),d_correct))\r\n\r\n%%\r\nm = 11;\r\nd_correct = 30;\r\nassert(isequal(daysInMonth(m),d_correct))\r\n\r\n%%\r\nm = 12;\r\nd_correct = 31;\r\nassert(isequal(daysInMonth(m),d_correct))\r\n\r\n%%\r\nm = 13;\r\nd_correct = -1;\r\nassert(isequal(daysInMonth(m),d_correct))\r\n\r\n%%\r\nm = randi([-100 0]);\r\nd_correct = -1;\r\nassert(isequal(daysInMonth(m),d_correct))\r\n\r\n","published":true,"deleted":false,"likes_count":3,"comments_count":0,"created_by":140356,"edited_by":null,"edited_at":null,"deleted_by":null,"deleted_at":null,"solvers_count":496,"test_suite_updated_at":null,"rescore_all_solutions":false,"group_id":1,"created_at":"2017-12-03T20:28:10.000Z","updated_at":"2026-05-29T05:05:38.000Z","published_at":"2017-12-03T20:28:10.000Z","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\u003eReturn the number of days in a given month in 2017. 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Note that i pretend that  poker cards goes from 1 to 10 so be careful with the test suite to avoid some traps like (nan, 0.05 , 'string', 55...) are invalid cards right ?","description_html":"\u003cp\u003eGiven a series of cards, return true if it's the famous hand. Note that i pretend that  poker cards goes from 1 to 10 so be careful with the test suite to avoid some traps like (nan, 0.05 , 'string', 55...) are invalid cards right ?\u003c/p\u003e","function_template":"function y = your_fcn_name(x)\r\n  y = x;\r\nend","test_suite":"%%\r\nfiletext = fileread('your_fcn_name.m'); \r\nassert(isempty(strfind(filetext, 'regexp')),'regexp() and its family are forbidden') \r\nassert(isempty(strfind(filetext, 'regexprep')),'regexprep() forbidden')\r\n%%\r\nx = [10 3 10 2 3];\r\ny_correct = false;\r\nassert(isequal(your_fcn_name(x),y_correct))\r\n%%\r\nx = [1 8 1 7 3];\r\ny_correct = false;\r\nassert(isequal(your_fcn_name(x),y_correct))\r\n%%\r\nx = [10 5 10 5 10];\r\ny_correct = true;\r\nassert(isequal(your_fcn_name(x),y_correct))\r\n%%\r\nx = [4 4 6 3 5];\r\ny_correct = false;\r\nassert(isequal(your_fcn_name(x),y_correct))\r\n%%\r\nx = [2 4 2 4 4];\r\ny_correct = true;\r\nassert(isequal(your_fcn_name(x),y_correct))\r\n%%\r\nx = [1 9 9 9 9];\r\ny_correct = false;\r\nassert(isequal(your_fcn_name(x),y_correct))\r\n%%\r\nx = [8 7 8 7 8];\r\ny_correct = true;\r\nassert(isequal(your_fcn_name(x),y_correct))\r\n%%\r\nx = [nan 3 10 2 3];\r\ny_correct = false;\r\nassert(isequal(your_fcn_name(x),y_correct))\r\n%%\r\nx = [10 'k' 'j' 2 3];\r\ny_correct = false;\r\nassert(isequal(your_fcn_name(x),y_correct))\r\n%%\r\nx = [8 7 8 0 8];\r\ny_correct = false; %inexistant card\r\nassert(isequal(your_fcn_name(x),y_correct))\r\n%%\r\nx = [8 17 8 17 8] ;\r\ny_correct = false %inexistant card\r\nassert(isequal(your_fcn_name(x),y_correct))\r\n%%\r\nx = [0 7 0 7 0];\r\ny_correct = false; %inexistant card\r\nassert(isequal(your_fcn_name(x),y_correct))\r\n%%\r\nx = [8 3 3 8 3];\r\ny_correct = true;\r\nassert(isequal(your_fcn_name(x),y_correct))\r\n%%\r\nx = [8 .3 .3 8 .3];\r\ny_correct = false;  %invalid card\r\nassert(isequal(your_fcn_name(x),y_correct))\r\n%%\r\nx = [1 1 1 5 5];\r\ny_correct = true;\r\nassert(isequal(your_fcn_name(x),y_correct))\r\n","published":true,"deleted":false,"likes_count":1,"comments_count":1,"created_by":156466,"edited_by":null,"edited_at":null,"deleted_by":null,"deleted_at":null,"solvers_count":29,"test_suite_updated_at":"2017-12-09T11:50:03.000Z","rescore_all_solutions":false,"group_id":1,"created_at":"2017-12-06T14:41:25.000Z","updated_at":"2026-05-29T05:05:41.000Z","published_at":"2017-12-06T14:41:25.000Z","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 series of cards, return true if it's the famous hand. Note that i pretend that poker cards goes from 1 to 10 so be careful with the test suite to avoid some traps like (nan, 0.05 , 'string', 55...) are invalid cards right ?\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":44437,"title":"How many days in a month?","description":"Return the number of days in a given month in 2017. If the input is not a valid month number, return -1.\r\n\r\nExamples:\r\n\r\n  Input: m = 1\r\n  Outpu: d = 31\r\n\r\n  Input:  m = 2\r\n  Output: d = 28\r\n\r\n  Input:  m = 13\r\n  Output: d = -1\r\n\r\nYou *cannot* use IF statements","description_html":"\u003cp\u003eReturn the number of days in a given month in 2017. If the input is not a valid month number, return -1.\u003c/p\u003e\u003cp\u003eExamples:\u003c/p\u003e\u003cpre class=\"language-matlab\"\u003eInput: m = 1\r\nOutpu: d = 31\r\n\u003c/pre\u003e\u003cpre class=\"language-matlab\"\u003eInput:  m = 2\r\nOutput: d = 28\r\n\u003c/pre\u003e\u003cpre class=\"language-matlab\"\u003eInput:  m = 13\r\nOutput: d = -1\r\n\u003c/pre\u003e\u003cp\u003eYou \u003cb\u003ecannot\u003c/b\u003e use IF statements\u003c/p\u003e","function_template":"function d = daysInMonth(m)\r\n  d = 31;\r\nend","test_suite":"%%\r\nfiletext = fileread('daysInMonth.m');\r\nassert(isempty(strfind(filetext, 'regexp')),'regexp hacks are forbidden')\r\nassert(isempty(strfind(filetext, 'if')),'IF statements are forbidden')\r\n\r\n%%\r\nm = 1;\r\nd_correct = 31;\r\nassert(isequal(daysInMonth(m),d_correct))\r\n\r\n%%\r\nm = 2;\r\nd_correct = 28;\r\nassert(isequal(daysInMonth(m),d_correct))\r\n\r\n%%\r\nm = 3;\r\nd_correct = 31;\r\nassert(isequal(daysInMonth(m),d_correct))\r\n\r\n%%\r\nm = 4;\r\nd_correct = 30;\r\nassert(isequal(daysInMonth(m),d_correct))\r\n\r\n%%\r\nm = 5;\r\nd_correct = 31;\r\nassert(isequal(daysInMonth(m),d_correct))\r\n\r\n%%\r\nm = 6;\r\nd_correct = 30;\r\nassert(isequal(daysInMonth(m),d_correct))\r\n\r\n%%\r\nm = 7;\r\nd_correct = 31;\r\nassert(isequal(daysInMonth(m),d_correct))\r\n\r\n%%\r\nm = 8;\r\nd_correct = 31;\r\nassert(isequal(daysInMonth(m),d_correct))\r\n\r\n%%\r\nm = 9;\r\nd_correct = 30;\r\nassert(isequal(daysInMonth(m),d_correct))\r\n\r\n%%\r\nm = 10;\r\nd_correct = 31;\r\nassert(isequal(daysInMonth(m),d_correct))\r\n\r\n%%\r\nm = 11;\r\nd_correct = 30;\r\nassert(isequal(daysInMonth(m),d_correct))\r\n\r\n%%\r\nm = 12;\r\nd_correct = 31;\r\nassert(isequal(daysInMonth(m),d_correct))\r\n\r\n%%\r\nm = 13;\r\nd_correct = -1;\r\nassert(isequal(daysInMonth(m),d_correct))\r\n\r\n%%\r\nm = randi([-100 0]);\r\nd_correct = -1;\r\nassert(isequal(daysInMonth(m),d_correct))\r\n\r\n","published":true,"deleted":false,"likes_count":3,"comments_count":0,"created_by":140356,"edited_by":null,"edited_at":null,"deleted_by":null,"deleted_at":null,"solvers_count":496,"test_suite_updated_at":null,"rescore_all_solutions":false,"group_id":1,"created_at":"2017-12-03T20:28:10.000Z","updated_at":"2026-05-29T05:05:38.000Z","published_at":"2017-12-03T20:28:10.000Z","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\u003eReturn the number of days in a given month in 2017. If the input is not a valid month number, return -1.\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: m = 1\\nOutpu: d = 31\\n\\nInput:  m = 2\\nOutput: d = 28\\n\\nInput:  m = 13\\nOutput: d = -1]]\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\u003eYou\u003c/w:t\u003e\u003c/w:r\u003e\u003cw:r\u003e\u003cw:t\u003e \u003c/w:t\u003e\u003c/w:r\u003e\u003cw:r\u003e\u003cw:rPr\u003e\u003cw:b/\u003e\u003c/w:rPr\u003e\u003cw:t\u003ecannot\u003c/w:t\u003e\u003c/w:r\u003e\u003cw:r\u003e\u003cw:t\u003e use IF statements\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":44441,"title":"Jack's hand in \"Titanic\" ♤","description":"Given a series of cards, return true if it's the famous hand. Note that i pretend that  poker cards goes from 1 to 10 so be careful with the test suite to avoid some traps like (nan, 0.05 , 'string', 55...) are invalid cards right ?","description_html":"\u003cp\u003eGiven a series of cards, return true if it's the famous hand. Note that i pretend that  poker cards goes from 1 to 10 so be careful with the test suite to avoid some traps like (nan, 0.05 , 'string', 55...) are invalid cards right ?\u003c/p\u003e","function_template":"function y = your_fcn_name(x)\r\n  y = x;\r\nend","test_suite":"%%\r\nfiletext = fileread('your_fcn_name.m'); \r\nassert(isempty(strfind(filetext, 'regexp')),'regexp() and its family are forbidden') \r\nassert(isempty(strfind(filetext, 'regexprep')),'regexprep() forbidden')\r\n%%\r\nx = [10 3 10 2 3];\r\ny_correct = false;\r\nassert(isequal(your_fcn_name(x),y_correct))\r\n%%\r\nx = [1 8 1 7 3];\r\ny_correct = false;\r\nassert(isequal(your_fcn_name(x),y_correct))\r\n%%\r\nx = [10 5 10 5 10];\r\ny_correct = true;\r\nassert(isequal(your_fcn_name(x),y_correct))\r\n%%\r\nx = [4 4 6 3 5];\r\ny_correct = false;\r\nassert(isequal(your_fcn_name(x),y_correct))\r\n%%\r\nx = [2 4 2 4 4];\r\ny_correct = true;\r\nassert(isequal(your_fcn_name(x),y_correct))\r\n%%\r\nx = [1 9 9 9 9];\r\ny_correct = false;\r\nassert(isequal(your_fcn_name(x),y_correct))\r\n%%\r\nx = [8 7 8 7 8];\r\ny_correct = true;\r\nassert(isequal(your_fcn_name(x),y_correct))\r\n%%\r\nx = [nan 3 10 2 3];\r\ny_correct = false;\r\nassert(isequal(your_fcn_name(x),y_correct))\r\n%%\r\nx = [10 'k' 'j' 2 3];\r\ny_correct = false;\r\nassert(isequal(your_fcn_name(x),y_correct))\r\n%%\r\nx = [8 7 8 0 8];\r\ny_correct = false; %inexistant card\r\nassert(isequal(your_fcn_name(x),y_correct))\r\n%%\r\nx = [8 17 8 17 8] ;\r\ny_correct = false %inexistant card\r\nassert(isequal(your_fcn_name(x),y_correct))\r\n%%\r\nx = [0 7 0 7 0];\r\ny_correct = false; %inexistant card\r\nassert(isequal(your_fcn_name(x),y_correct))\r\n%%\r\nx = [8 3 3 8 3];\r\ny_correct = true;\r\nassert(isequal(your_fcn_name(x),y_correct))\r\n%%\r\nx = [8 .3 .3 8 .3];\r\ny_correct = false;  %invalid card\r\nassert(isequal(your_fcn_name(x),y_correct))\r\n%%\r\nx = [1 1 1 5 5];\r\ny_correct = true;\r\nassert(isequal(your_fcn_name(x),y_correct))\r\n","published":true,"deleted":false,"likes_count":1,"comments_count":1,"created_by":156466,"edited_by":null,"edited_at":null,"deleted_by":null,"deleted_at":null,"solvers_count":29,"test_suite_updated_at":"2017-12-09T11:50:03.000Z","rescore_all_solutions":false,"group_id":1,"created_at":"2017-12-06T14:41:25.000Z","updated_at":"2026-05-29T05:05:41.000Z","published_at":"2017-12-06T14:41:25.000Z","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 series of cards, return true if it's the famous hand. 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