{"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":750,"title":"Accumulate Cells","description":"Given a combining function, a cell array, and an initial value, accumulate the result.\r\n\r\nFor example,\r\n \r\n  accumcell(@plus,{1,2,3,4},0) \r\n\r\nshould return 10, while \r\n\r\n  accumcell(@times,{1,2,3,4},1) \r\n\r\nshould return 24.\r\n\r\nThe elements of C should be such that the combining function can apply to them without generating an error (all the same size, for example).","description_html":"\u003cp\u003eGiven a combining function, a cell array, and an initial value, accumulate the result.\u003c/p\u003e\u003cp\u003eFor example,\u003c/p\u003e\u003cpre class=\"language-matlab\"\u003eaccumcell(@plus,{1,2,3,4},0) \r\n\u003c/pre\u003e\u003cp\u003eshould return 10, while\u003c/p\u003e\u003cpre class=\"language-matlab\"\u003eaccumcell(@times,{1,2,3,4},1) \r\n\u003c/pre\u003e\u003cp\u003eshould return 24.\u003c/p\u003e\u003cp\u003eThe elements of C should be such that the combining function can apply to them without generating an error (all the same size, for example).\u003c/p\u003e","function_template":"function a = accumcell(fcn,C,init)\r\n  a = init;\r\nend","test_suite":"%%\r\nassert(isequal(accumcell(@plus,{1,2,3,4},0),10))\r\nassert(isequal(accumcell(@times,{1,2,3,4},1),24))\r\nassert(isequal(accumcell(@times,{1,2,3,4},0),0))\r\nM = rand(3,4,5);\r\nC = num2cell(M,1:2);\r\nassert(isequal(accumcell(@plus,C,0),sum(M,3)))\r\nassert(isequal(accumcell(@times,C,1),prod(M,3)))","published":true,"deleted":false,"likes_count":1,"comments_count":2,"created_by":3117,"edited_by":null,"edited_at":null,"deleted_by":null,"deleted_at":null,"solvers_count":48,"test_suite_updated_at":null,"rescore_all_solutions":false,"group_id":1,"created_at":"2012-06-06T15:11:19.000Z","updated_at":"2026-05-26T04:33:54.000Z","published_at":"2012-06-06T15:11:19.000Z","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\u003eGiven a combining function, a cell array, and an initial value, accumulate the result.\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\u003eFor example,\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[accumcell(@plus,{1,2,3,4},0)]]\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 10, while\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[accumcell(@times,{1,2,3,4},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\u003eshould return 24.\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 elements of C should be such that the combining function can apply to them without generating an error (all the same size, for example).\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":750,"title":"Accumulate Cells","description":"Given a combining function, a cell array, and an initial value, accumulate the result.\r\n\r\nFor example,\r\n \r\n  accumcell(@plus,{1,2,3,4},0) \r\n\r\nshould return 10, while \r\n\r\n  accumcell(@times,{1,2,3,4},1) \r\n\r\nshould return 24.\r\n\r\nThe elements of C should be such that the combining function can apply to them without generating an error (all the same size, for example).","description_html":"\u003cp\u003eGiven a combining function, a cell array, and an initial value, accumulate the result.\u003c/p\u003e\u003cp\u003eFor example,\u003c/p\u003e\u003cpre class=\"language-matlab\"\u003eaccumcell(@plus,{1,2,3,4},0) \r\n\u003c/pre\u003e\u003cp\u003eshould return 10, while\u003c/p\u003e\u003cpre class=\"language-matlab\"\u003eaccumcell(@times,{1,2,3,4},1) \r\n\u003c/pre\u003e\u003cp\u003eshould return 24.\u003c/p\u003e\u003cp\u003eThe elements of C should be such that the combining function can apply to them without generating an error (all the same size, for example).\u003c/p\u003e","function_template":"function a = accumcell(fcn,C,init)\r\n  a = init;\r\nend","test_suite":"%%\r\nassert(isequal(accumcell(@plus,{1,2,3,4},0),10))\r\nassert(isequal(accumcell(@times,{1,2,3,4},1),24))\r\nassert(isequal(accumcell(@times,{1,2,3,4},0),0))\r\nM = rand(3,4,5);\r\nC = num2cell(M,1:2);\r\nassert(isequal(accumcell(@plus,C,0),sum(M,3)))\r\nassert(isequal(accumcell(@times,C,1),prod(M,3)))","published":true,"deleted":false,"likes_count":1,"comments_count":2,"created_by":3117,"edited_by":null,"edited_at":null,"deleted_by":null,"deleted_at":null,"solvers_count":48,"test_suite_updated_at":null,"rescore_all_solutions":false,"group_id":1,"created_at":"2012-06-06T15:11:19.000Z","updated_at":"2026-05-26T04:33:54.000Z","published_at":"2012-06-06T15:11:19.000Z","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\u003eGiven a combining function, a cell array, and an initial value, accumulate the result.\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\u003eFor example,\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[accumcell(@plus,{1,2,3,4},0)]]\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 10, 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