{"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":1407,"title":"Is it an Armstrong number?","description":"An Armstrong number of three digits is an integer such that the sum of the cubes of its digits is equal to the number itself. For example, 153 is an Armstrong number since 1^3 + 5^3 + 3^3 = 153.","description_html":"\u003cp\u003eAn Armstrong number of three digits is an integer such that the sum of the cubes of its digits is equal to the number itself. For example, 153 is an Armstrong number since 1^3 + 5^3 + 3^3 = 153.\u003c/p\u003e","function_template":"function y = armno(x)\r\n  y = x^3;\r\nend","test_suite":"%%\r\nx = 153;\r\ny_correct = 1;\r\nassert(isequal(armno(x),y_correct))\r\n\r\n%%\r\nx = 143;\r\ny_correct = 0;\r\nassert(isequal(armno(x),y_correct))\r\n\r\n%%\r\nx = 370;\r\ny_correct = 1;\r\nassert(isequal(armno(x),y_correct))\r\n\r\n%%\r\nx = 371;\r\ny_correct = 1;\r\nassert(isequal(armno(x),y_correct))\r\n\r\n%%\r\nx = 145;\r\ny_correct = 0;\r\nassert(isequal(armno(x),y_correct))\r\n\r\n%%\r\nx = 407;\r\ny_correct = 1;\r\nassert(isequal(armno(x),y_correct))\r\n\r\n%%\r\nx = 136;\r\ny_correct = 0;\r\nassert(isequal(armno(x),y_correct))","published":true,"deleted":false,"likes_count":3,"comments_count":0,"created_by":6975,"edited_by":null,"edited_at":null,"deleted_by":null,"deleted_at":null,"solvers_count":355,"test_suite_updated_at":null,"rescore_all_solutions":false,"group_id":44,"created_at":"2013-04-01T16:50:37.000Z","updated_at":"2026-05-05T05:20:20.000Z","published_at":"2013-04-01T16:50:37.000Z","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\u003eAn Armstrong number of three digits is an integer such that the sum of the cubes of its digits is equal to the number itself. For example, 153 is an Armstrong number since 1^3 + 5^3 + 3^3 = 153.\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":1407,"title":"Is it an Armstrong number?","description":"An Armstrong number of three digits is an integer such that the sum of the cubes of its digits is equal to the number itself. For example, 153 is an Armstrong number since 1^3 + 5^3 + 3^3 = 153.","description_html":"\u003cp\u003eAn Armstrong number of three digits is an integer such that the sum of the cubes of its digits is equal to the number itself. For example, 153 is an Armstrong number since 1^3 + 5^3 + 3^3 = 153.\u003c/p\u003e","function_template":"function y = armno(x)\r\n  y = x^3;\r\nend","test_suite":"%%\r\nx = 153;\r\ny_correct = 1;\r\nassert(isequal(armno(x),y_correct))\r\n\r\n%%\r\nx = 143;\r\ny_correct = 0;\r\nassert(isequal(armno(x),y_correct))\r\n\r\n%%\r\nx = 370;\r\ny_correct = 1;\r\nassert(isequal(armno(x),y_correct))\r\n\r\n%%\r\nx = 371;\r\ny_correct = 1;\r\nassert(isequal(armno(x),y_correct))\r\n\r\n%%\r\nx = 145;\r\ny_correct = 0;\r\nassert(isequal(armno(x),y_correct))\r\n\r\n%%\r\nx = 407;\r\ny_correct = 1;\r\nassert(isequal(armno(x),y_correct))\r\n\r\n%%\r\nx = 136;\r\ny_correct = 0;\r\nassert(isequal(armno(x),y_correct))","published":true,"deleted":false,"likes_count":3,"comments_count":0,"created_by":6975,"edited_by":null,"edited_at":null,"deleted_by":null,"deleted_at":null,"solvers_count":355,"test_suite_updated_at":null,"rescore_all_solutions":false,"group_id":44,"created_at":"2013-04-01T16:50:37.000Z","updated_at":"2026-05-05T05:20:20.000Z","published_at":"2013-04-01T16:50:37.000Z","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\u003eAn Armstrong number of three digits is an integer such that the sum of the cubes of its digits is equal to the number itself. 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