{"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":42519,"title":"Sum My Indices","description":"Given inputs M and N (in that order), output an MxN matrix whose entries are equal to the sum of their indices.\r\n\r\nExample input/output pairs:\r\n\r\n=============\r\n\r\nInput: 1,2\r\n\r\nOutput: [2,3]\r\n\r\n=============\r\n\r\nInput: 2,2\r\n\r\nOutput: [2 3; 3 4]\r\n\r\n=============\r\n\r\nInput: 3,2\r\n\r\nOutput: [2,3; 3 4; 4 5]\r\n","description_html":"\u003cp\u003eGiven inputs M and N (in that order), output an MxN matrix whose entries are equal to the sum of their indices.\u003c/p\u003e\u003cp\u003eExample input/output pairs:\u003c/p\u003e\u003cp\u003e=============\u003c/p\u003e\u003cp\u003eInput: 1,2\u003c/p\u003e\u003cp\u003eOutput: [2,3]\u003c/p\u003e\u003cp\u003e=============\u003c/p\u003e\u003cp\u003eInput: 2,2\u003c/p\u003e\u003cp\u003eOutput: [2 3; 3 4]\u003c/p\u003e\u003cp\u003e=============\u003c/p\u003e\u003cp\u003eInput: 3,2\u003c/p\u003e\u003cp\u003eOutput: [2,3; 3 4; 4 5]\u003c/p\u003e","function_template":"function y = sumMyIndices(x)\r\n  y = x;\r\nend","test_suite":"%%\r\nM = 1;\r\nN = 1;\r\ny_correct = [2];\r\nassert(isequal(sumMyIndices(M,N),y_correct))\r\n\r\n%%\r\nM = 1;\r\nN = 2;\r\ny_correct = [2,3];\r\nassert(isequal(sumMyIndices(M,N),y_correct))\r\n\r\n%%\r\nM = 3;\r\nN = 2;\r\ny_correct = [2,3; 3,4; 4,5];\r\nassert(isequal(sumMyIndices(M,N),y_correct))\r\n\r\n%%\r\nM = 3;\r\nN = 3;\r\ny_correct = [2,3,4; 3,4,5; 4,5,6];\r\nassert(isequal(sumMyIndices(M,N),y_correct))\r\n\r\n%%\r\nM = 4;\r\nN = 5;\r\ny_correct = [\r\n     2     3     4     5     6\r\n     3     4     5     6     7\r\n     4     5     6     7     8\r\n     5     6     7     8     9\r\n];\r\nassert(isequal(sumMyIndices(M,N),y_correct))\r\n\r\n%%\r\nM = 5;\r\nN = 8;\r\ny_correct = [\r\n     2     3     4     5     6     7     8     9\r\n     3     4     5     6     7     8     9    10\r\n     4     5     6     7     8     9    10    11\r\n     5     6     7     8     9    10    11    12\r\n     6     7     8     9    10    11    12    13\r\n];\r\nassert(isequal(sumMyIndices(M,N),y_correct))","published":true,"deleted":false,"likes_count":4,"comments_count":2,"created_by":39,"edited_by":null,"edited_at":null,"deleted_by":null,"deleted_at":null,"solvers_count":177,"test_suite_updated_at":"2018-03-03T19:27:06.000Z","rescore_all_solutions":false,"group_id":39,"created_at":"2015-08-19T23:08:22.000Z","updated_at":"2026-04-02T08:02:52.000Z","published_at":"2015-08-20T00:53:29.000Z","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 inputs M and N (in that order), output an MxN matrix whose entries are equal to the sum of their indices.\u003c/w:t\u003e\u003c/w:r\u003e\u003c/w:p\u003e\u003cw:p\u003e\u003cw:pPr\u003e\u003cw:pStyle w:val=\\\"text\\\"/\u003e\u003cw:jc w:val=\\\"left\\\"/\u003e\u003c/w:pPr\u003e\u003cw:r\u003e\u003cw:t\u003eExample input/output pairs:\u003c/w:t\u003e\u003c/w:r\u003e\u003c/w:p\u003e\u003cw:p\u003e\u003cw:pPr\u003e\u003cw:pStyle w:val=\\\"text\\\"/\u003e\u003cw:jc w:val=\\\"left\\\"/\u003e\u003c/w:pPr\u003e\u003cw:r\u003e\u003cw:t\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\u003cw:jc w:val=\\\"left\\\"/\u003e\u003c/w:pPr\u003e\u003cw:r\u003e\u003cw:t\u003eInput: 1,2\u003c/w:t\u003e\u003c/w:r\u003e\u003c/w:p\u003e\u003cw:p\u003e\u003cw:pPr\u003e\u003cw:pStyle w:val=\\\"text\\\"/\u003e\u003cw:jc w:val=\\\"left\\\"/\u003e\u003c/w:pPr\u003e\u003cw:r\u003e\u003cw:t\u003eOutput: [2,3]\u003c/w:t\u003e\u003c/w:r\u003e\u003c/w:p\u003e\u003cw:p\u003e\u003cw:pPr\u003e\u003cw:pStyle w:val=\\\"text\\\"/\u003e\u003cw:jc w:val=\\\"left\\\"/\u003e\u003c/w:pPr\u003e\u003cw:r\u003e\u003cw:t\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\u003cw:jc w:val=\\\"left\\\"/\u003e\u003c/w:pPr\u003e\u003cw:r\u003e\u003cw:t\u003eInput: 2,2\u003c/w:t\u003e\u003c/w:r\u003e\u003c/w:p\u003e\u003cw:p\u003e\u003cw:pPr\u003e\u003cw:pStyle w:val=\\\"text\\\"/\u003e\u003cw:jc w:val=\\\"left\\\"/\u003e\u003c/w:pPr\u003e\u003cw:r\u003e\u003cw:t\u003eOutput: [2 3; 3 4]\u003c/w:t\u003e\u003c/w:r\u003e\u003c/w:p\u003e\u003cw:p\u003e\u003cw:pPr\u003e\u003cw:pStyle w:val=\\\"text\\\"/\u003e\u003cw:jc w:val=\\\"left\\\"/\u003e\u003c/w:pPr\u003e\u003cw:r\u003e\u003cw:t\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\u003cw:jc w:val=\\\"left\\\"/\u003e\u003c/w:pPr\u003e\u003cw:r\u003e\u003cw:t\u003eInput: 3,2\u003c/w:t\u003e\u003c/w:r\u003e\u003c/w:p\u003e\u003cw:p\u003e\u003cw:pPr\u003e\u003cw:pStyle w:val=\\\"text\\\"/\u003e\u003cw:jc w:val=\\\"left\\\"/\u003e\u003c/w:pPr\u003e\u003cw:r\u003e\u003cw:t\u003eOutput: [2,3; 3 4; 4 5]\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":42519,"title":"Sum My Indices","description":"Given inputs M and N (in that order), output an MxN matrix whose entries are equal to the sum of their indices.\r\n\r\nExample input/output pairs:\r\n\r\n=============\r\n\r\nInput: 1,2\r\n\r\nOutput: [2,3]\r\n\r\n=============\r\n\r\nInput: 2,2\r\n\r\nOutput: [2 3; 3 4]\r\n\r\n=============\r\n\r\nInput: 3,2\r\n\r\nOutput: [2,3; 3 4; 4 5]\r\n","description_html":"\u003cp\u003eGiven inputs M and N (in that order), output an MxN matrix whose entries are equal to the sum of their indices.\u003c/p\u003e\u003cp\u003eExample input/output pairs:\u003c/p\u003e\u003cp\u003e=============\u003c/p\u003e\u003cp\u003eInput: 1,2\u003c/p\u003e\u003cp\u003eOutput: [2,3]\u003c/p\u003e\u003cp\u003e=============\u003c/p\u003e\u003cp\u003eInput: 2,2\u003c/p\u003e\u003cp\u003eOutput: [2 3; 3 4]\u003c/p\u003e\u003cp\u003e=============\u003c/p\u003e\u003cp\u003eInput: 3,2\u003c/p\u003e\u003cp\u003eOutput: [2,3; 3 4; 4 5]\u003c/p\u003e","function_template":"function y = sumMyIndices(x)\r\n  y = x;\r\nend","test_suite":"%%\r\nM = 1;\r\nN = 1;\r\ny_correct = [2];\r\nassert(isequal(sumMyIndices(M,N),y_correct))\r\n\r\n%%\r\nM = 1;\r\nN = 2;\r\ny_correct = [2,3];\r\nassert(isequal(sumMyIndices(M,N),y_correct))\r\n\r\n%%\r\nM = 3;\r\nN = 2;\r\ny_correct = [2,3; 3,4; 4,5];\r\nassert(isequal(sumMyIndices(M,N),y_correct))\r\n\r\n%%\r\nM = 3;\r\nN = 3;\r\ny_correct = [2,3,4; 3,4,5; 4,5,6];\r\nassert(isequal(sumMyIndices(M,N),y_correct))\r\n\r\n%%\r\nM = 4;\r\nN = 5;\r\ny_correct = [\r\n     2     3     4     5     6\r\n     3     4     5     6     7\r\n     4     5     6     7     8\r\n     5     6     7     8     9\r\n];\r\nassert(isequal(sumMyIndices(M,N),y_correct))\r\n\r\n%%\r\nM = 5;\r\nN = 8;\r\ny_correct = [\r\n     2     3     4     5     6     7     8     9\r\n     3     4     5     6     7     8     9    10\r\n     4     5     6     7     8     9    10    11\r\n     5     6     7     8     9    10    11    12\r\n     6     7     8     9    10    11    12    13\r\n];\r\nassert(isequal(sumMyIndices(M,N),y_correct))","published":true,"deleted":false,"likes_count":4,"comments_count":2,"created_by":39,"edited_by":null,"edited_at":null,"deleted_by":null,"deleted_at":null,"solvers_count":177,"test_suite_updated_at":"2018-03-03T19:27:06.000Z","rescore_all_solutions":false,"group_id":39,"created_at":"2015-08-19T23:08:22.000Z","updated_at":"2026-04-02T08:02:52.000Z","published_at":"2015-08-20T00:53:29.000Z","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 inputs M and N (in that order), output an MxN matrix whose entries are equal to the sum of their indices.\u003c/w:t\u003e\u003c/w:r\u003e\u003c/w:p\u003e\u003cw:p\u003e\u003cw:pPr\u003e\u003cw:pStyle w:val=\\\"text\\\"/\u003e\u003cw:jc w:val=\\\"left\\\"/\u003e\u003c/w:pPr\u003e\u003cw:r\u003e\u003cw:t\u003eExample input/output pairs:\u003c/w:t\u003e\u003c/w:r\u003e\u003c/w:p\u003e\u003cw:p\u003e\u003cw:pPr\u003e\u003cw:pStyle w:val=\\\"text\\\"/\u003e\u003cw:jc w:val=\\\"left\\\"/\u003e\u003c/w:pPr\u003e\u003cw:r\u003e\u003cw:t\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\u003cw:jc w:val=\\\"left\\\"/\u003e\u003c/w:pPr\u003e\u003cw:r\u003e\u003cw:t\u003eInput: 1,2\u003c/w:t\u003e\u003c/w:r\u003e\u003c/w:p\u003e\u003cw:p\u003e\u003cw:pPr\u003e\u003cw:pStyle w:val=\\\"text\\\"/\u003e\u003cw:jc w:val=\\\"left\\\"/\u003e\u003c/w:pPr\u003e\u003cw:r\u003e\u003cw:t\u003eOutput: [2,3]\u003c/w:t\u003e\u003c/w:r\u003e\u003c/w:p\u003e\u003cw:p\u003e\u003cw:pPr\u003e\u003cw:pStyle w:val=\\\"text\\\"/\u003e\u003cw:jc w:val=\\\"left\\\"/\u003e\u003c/w:pPr\u003e\u003cw:r\u003e\u003cw:t\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\u003cw:jc w:val=\\\"left\\\"/\u003e\u003c/w:pPr\u003e\u003cw:r\u003e\u003cw:t\u003eInput: 2,2\u003c/w:t\u003e\u003c/w:r\u003e\u003c/w:p\u003e\u003cw:p\u003e\u003cw:pPr\u003e\u003cw:pStyle w:val=\\\"text\\\"/\u003e\u003cw:jc w:val=\\\"left\\\"/\u003e\u003c/w:pPr\u003e\u003cw:r\u003e\u003cw:t\u003eOutput: [2 3; 3 4]\u003c/w:t\u003e\u003c/w:r\u003e\u003c/w:p\u003e\u003cw:p\u003e\u003cw:pPr\u003e\u003cw:pStyle w:val=\\\"text\\\"/\u003e\u003cw:jc w:val=\\\"left\\\"/\u003e\u003c/w:pPr\u003e\u003cw:r\u003e\u003cw:t\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\u003cw:jc w:val=\\\"left\\\"/\u003e\u003c/w:pPr\u003e\u003cw:r\u003e\u003cw:t\u003eInput: 3,2\u003c/w:t\u003e\u003c/w:r\u003e\u003c/w:p\u003e\u003cw:p\u003e\u003cw:pPr\u003e\u003cw:pStyle w:val=\\\"text\\\"/\u003e\u003cw:jc w:val=\\\"left\\\"/\u003e\u003c/w:pPr\u003e\u003cw:r\u003e\u003cw:t\u003eOutput: [2,3; 3 4; 4 5]\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":"Indexing IV","count":1,"selected":false}],[{"value":"easy","count":1,"selected":false}]],"term":"tag:\"index sum\"","page":1,"per_page":50,"sort":"map(difficulty_value,0,0,999) asc"}}