{"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":43181,"title":"Find index of a string in a cell array","description":"Write a function that finds the index at which the cell array of strings C contains the exact string S.\r\n\r\nSo if \r\n\r\n  C = {'twenty-one'; 'twenty-two'; 'twenty-three'; 'one'; 'two'; 'three'};\r\n\r\nthen\r\n\r\n  y = cellfind('one', C); \r\n\r\nshould return 4","description_html":"\u003cp\u003eWrite a function that finds the index at which the cell array of strings C contains the exact string S.\u003c/p\u003e\u003cp\u003eSo if\u003c/p\u003e\u003cpre class=\"language-matlab\"\u003eC = {'twenty-one'; 'twenty-two'; 'twenty-three'; 'one'; 'two'; 'three'};\r\n\u003c/pre\u003e\u003cp\u003ethen\u003c/p\u003e\u003cpre class=\"language-matlab\"\u003ey = cellfind('one', C); \r\n\u003c/pre\u003e\u003cp\u003eshould return 4\u003c/p\u003e","function_template":"function y = cellfind(S, C)\r\n  y = find(C == S);\r\nend","test_suite":"%%\r\nx = {'twenty-one'; 'twenty-two'; 'twenty-three'; 'one'; 'two'; 'three'};\r\nfor i = 1:6\r\n    assert(isequal(cellfind(x{i}, x),i))\r\n    validatestring(x{cellfind(x{i}, x)}, {x{i}})\r\nend\r\n","published":true,"deleted":false,"likes_count":1,"comments_count":1,"created_by":57323,"edited_by":null,"edited_at":null,"deleted_by":null,"deleted_at":null,"solvers_count":40,"test_suite_updated_at":null,"rescore_all_solutions":false,"group_id":1,"created_at":"2016-10-07T23:17:42.000Z","updated_at":"2026-05-29T01:26:35.000Z","published_at":"2016-10-07T23:17:42.000Z","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\u003eWrite a function that finds the index at which the cell array of strings C contains the exact string S.\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\u003eSo if\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[C = {'twenty-one'; 'twenty-two'; 'twenty-three'; 'one'; 'two'; 'three'};]]\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\u003ethen\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[y = cellfind('one', C);]]\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\u003eshould return 4\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":43181,"title":"Find index of a string in a cell array","description":"Write a function that finds the index at which the cell array of strings C contains the exact string S.\r\n\r\nSo if \r\n\r\n  C = {'twenty-one'; 'twenty-two'; 'twenty-three'; 'one'; 'two'; 'three'};\r\n\r\nthen\r\n\r\n  y = cellfind('one', C); \r\n\r\nshould return 4","description_html":"\u003cp\u003eWrite a function that finds the index at which the cell array of strings C contains the exact string S.\u003c/p\u003e\u003cp\u003eSo if\u003c/p\u003e\u003cpre class=\"language-matlab\"\u003eC = {'twenty-one'; 'twenty-two'; 'twenty-three'; 'one'; 'two'; 'three'};\r\n\u003c/pre\u003e\u003cp\u003ethen\u003c/p\u003e\u003cpre class=\"language-matlab\"\u003ey = cellfind('one', C); \r\n\u003c/pre\u003e\u003cp\u003eshould return 4\u003c/p\u003e","function_template":"function y = cellfind(S, C)\r\n  y = find(C == S);\r\nend","test_suite":"%%\r\nx = {'twenty-one'; 'twenty-two'; 'twenty-three'; 'one'; 'two'; 'three'};\r\nfor i = 1:6\r\n    assert(isequal(cellfind(x{i}, x),i))\r\n    validatestring(x{cellfind(x{i}, x)}, {x{i}})\r\nend\r\n","published":true,"deleted":false,"likes_count":1,"comments_count":1,"created_by":57323,"edited_by":null,"edited_at":null,"deleted_by":null,"deleted_at":null,"solvers_count":40,"test_suite_updated_at":null,"rescore_all_solutions":false,"group_id":1,"created_at":"2016-10-07T23:17:42.000Z","updated_at":"2026-05-29T01:26:35.000Z","published_at":"2016-10-07T23:17:42.000Z","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\u003eWrite a function that finds the index at which the cell array of strings C contains the exact string S.\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\u003eSo if\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[C = {'twenty-one'; 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