{"group":{"id":1,"name":"Community","lockable":false,"created_at":"2012-01-18T18:02:15.000Z","updated_at":"2026-04-06T14:01:22.000Z","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":"2026-04-06T00:00:00.000Z","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":170,"title":"First N Perfect Squares","description":"*Description*\r\n\r\nReturn the first N perfect squares\r\n\r\n*Example*\r\n\r\n    input = 4;\r\n    output = [ 1 4 9 16 ];","description_html":"\u003cp\u003e\u003cb\u003eDescription\u003c/b\u003e\u003c/p\u003e\u003cp\u003eReturn the first N perfect squares\u003c/p\u003e\u003cp\u003e\u003cb\u003eExample\u003c/b\u003e\u003c/p\u003e\u003cpre\u003e    input = 4;\r\n    output = [ 1 4 9 16 ];\u003c/pre\u003e","function_template":"function y = squares(N)\r\n  y = N;\r\nend","test_suite":"%%\r\nx = 4;\r\ny_correct = [ 1 4 9 16 ];\r\nassert(isequal(squares(x),y_correct))\r\n\r\n%%\r\nx = 1;\r\ny_correct = [ 1 ];\r\nassert(isequal(squares(x),y_correct))\r\n\r\n%%\r\nx = 10;\r\ny_correct = [ 1 4 9 16 25 36 49 64 81 100 ];\r\nassert(isequal(squares(x),y_correct))\r\n\r\n%%\r\nx = 20;\r\ny_correct = [ 1 4 9 16 25 36 49 64 81 100 121 144 169 196 225 256 289 324 361 400 ];\r\nassert(isequal(squares(x),y_correct))","published":true,"deleted":false,"likes_count":6,"comments_count":0,"created_by":134,"edited_by":null,"edited_at":null,"deleted_by":null,"deleted_at":null,"solvers_count":922,"test_suite_updated_at":"2018-05-23T13:26:46.000Z","rescore_all_solutions":false,"group_id":44,"created_at":"2012-01-30T05:03:32.000Z","updated_at":"2026-04-03T04:09:22.000Z","published_at":"2012-01-30T05:03:48.000Z","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:rPr\u003e\u003cw:b/\u003e\u003c/w:rPr\u003e\u003cw:t\u003eDescription\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\u003eReturn the first N perfect squares\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:rPr\u003e\u003cw:b/\u003e\u003c/w:rPr\u003e\u003cw:t\u003eExample\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 = 4;\\n    output = [ 1 4 9 16 ];]]\u003e\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":794,"title":"Matrix with different incremental runs","description":"Given a vector of positive integers\r\n\r\n  a = [ 3 2 4 ];\r\n\r\ncreate the matrix where the *i* th column contains the vector *1:a(i)* possibly padded\r\nwith zeros:\r\n\r\n  b = [ 1 1 1\r\n        2 2 2\r\n        3 0 3\r\n        0 0 4 ];","description_html":"\u003cp\u003eGiven a vector of positive integers\u003c/p\u003e\u003cpre class=\"language-matlab\"\u003ea = [ 3 2 4 ];\r\n\u003c/pre\u003e\u003cp\u003ecreate the matrix where the \u003cb\u003ei\u003c/b\u003e th column contains the vector \u003cb\u003e1:a(i)\u003c/b\u003e possibly padded\r\nwith zeros:\u003c/p\u003e\u003cpre class=\"language-matlab\"\u003eb = [ 1 1 1\r\n      2 2 2\r\n      3 0 3\r\n      0 0 4 ];\r\n\u003c/pre\u003e","function_template":"function b = your_fcn_name(a)\r\n  b = a;\r\nend","test_suite":"%%\r\na = [ 3 2 4 ];\r\nb = [ 1 1 1\r\n        2 2 2\r\n        3 0 3\r\n        0 0 4 ];\r\nassert(isequal(your_fcn_name(a),b))\r\n\r\n\r\n%%\r\na = [1 0 8 9 14];\r\nb =[ 1     0     1     1     1\r\n     0     0     2     2     2\r\n     0     0     3     3     3\r\n     0     0     4     4     4\r\n     0     0     5     5     5\r\n     0     0     6     6     6\r\n     0     0     7     7     7\r\n     0     0     8     8     8\r\n     0     0     0     9     9\r\n     0     0     0     0    10\r\n     0     0     0     0    11\r\n     0     0     0     0    12\r\n     0     0     0     0    13\r\n     0     0     0     0    14];\r\nassert(isequal(your_fcn_name(a),b))\r\n\r\n%%\r\n a = [ 4 2 4 ];\r\nb =[ 1     1     1\r\n     2     2     2\r\n     3     0     3\r\n     4     0     4];\r\nassert(isequal(your_fcn_name(a),b))\r\n\r\n%% one value\r\na= 1;\r\n\r\nassert(isequal(your_fcn_name(a),1))\r\n\r\n%% empty vector \r\na = [];\r\n\r\nassert(isequal(your_fcn_name(a),[]))","published":true,"deleted":false,"likes_count":5,"comments_count":0,"created_by":639,"edited_by":null,"edited_at":null,"deleted_by":null,"deleted_at":null,"solvers_count":581,"test_suite_updated_at":null,"rescore_all_solutions":false,"group_id":19,"created_at":"2012-06-27T09:12:25.000Z","updated_at":"2026-03-15T18:51:31.000Z","published_at":"2012-06-27T09:12:25.000Z","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\",\"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 vector of positive integers\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[a = [ 3 2 4 ];]]\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\u003ecreate the matrix where the\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\u003ei\u003c/w:t\u003e\u003c/w:r\u003e\u003cw:r\u003e\u003cw:t\u003e th column contains the vector\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\u003e1:a(i)\u003c/w:t\u003e\u003c/w:r\u003e\u003cw:r\u003e\u003cw:t\u003e possibly padded with zeros:\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[b = [ 1 1 1\\n      2 2 2\\n      3 0 3\\n      0 0 4 ];]]\u003e\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":{"errors":[],"problems":[{"id":170,"title":"First N Perfect Squares","description":"*Description*\r\n\r\nReturn the first N perfect squares\r\n\r\n*Example*\r\n\r\n    input = 4;\r\n    output = [ 1 4 9 16 ];","description_html":"\u003cp\u003e\u003cb\u003eDescription\u003c/b\u003e\u003c/p\u003e\u003cp\u003eReturn the first N perfect squares\u003c/p\u003e\u003cp\u003e\u003cb\u003eExample\u003c/b\u003e\u003c/p\u003e\u003cpre\u003e    input = 4;\r\n    output = [ 1 4 9 16 ];\u003c/pre\u003e","function_template":"function y = squares(N)\r\n  y = N;\r\nend","test_suite":"%%\r\nx = 4;\r\ny_correct = [ 1 4 9 16 ];\r\nassert(isequal(squares(x),y_correct))\r\n\r\n%%\r\nx = 1;\r\ny_correct = [ 1 ];\r\nassert(isequal(squares(x),y_correct))\r\n\r\n%%\r\nx = 10;\r\ny_correct = [ 1 4 9 16 25 36 49 64 81 100 ];\r\nassert(isequal(squares(x),y_correct))\r\n\r\n%%\r\nx = 20;\r\ny_correct = [ 1 4 9 16 25 36 49 64 81 100 121 144 169 196 225 256 289 324 361 400 ];\r\nassert(isequal(squares(x),y_correct))","published":true,"deleted":false,"likes_count":6,"comments_count":0,"created_by":134,"edited_by":null,"edited_at":null,"deleted_by":null,"deleted_at":null,"solvers_count":922,"test_suite_updated_at":"2018-05-23T13:26:46.000Z","rescore_all_solutions":false,"group_id":44,"created_at":"2012-01-30T05:03:32.000Z","updated_at":"2026-04-03T04:09:22.000Z","published_at":"2012-01-30T05:03:48.000Z","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:rPr\u003e\u003cw:b/\u003e\u003c/w:rPr\u003e\u003cw:t\u003eDescription\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\u003eReturn the first N perfect squares\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:rPr\u003e\u003cw:b/\u003e\u003c/w:rPr\u003e\u003cw:t\u003eExample\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 = 4;\\n    output = [ 1 4 9 16 ];]]\u003e\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":794,"title":"Matrix with different incremental runs","description":"Given a vector of positive integers\r\n\r\n  a = [ 3 2 4 ];\r\n\r\ncreate the matrix where the *i* th column contains the vector *1:a(i)* possibly padded\r\nwith zeros:\r\n\r\n  b = [ 1 1 1\r\n        2 2 2\r\n        3 0 3\r\n        0 0 4 ];","description_html":"\u003cp\u003eGiven a vector of positive integers\u003c/p\u003e\u003cpre class=\"language-matlab\"\u003ea = [ 3 2 4 ];\r\n\u003c/pre\u003e\u003cp\u003ecreate the matrix where the \u003cb\u003ei\u003c/b\u003e th column contains the vector \u003cb\u003e1:a(i)\u003c/b\u003e possibly padded\r\nwith zeros:\u003c/p\u003e\u003cpre class=\"language-matlab\"\u003eb = [ 1 1 1\r\n      2 2 2\r\n      3 0 3\r\n      0 0 4 ];\r\n\u003c/pre\u003e","function_template":"function b = your_fcn_name(a)\r\n  b = a;\r\nend","test_suite":"%%\r\na = [ 3 2 4 ];\r\nb = [ 1 1 1\r\n        2 2 2\r\n        3 0 3\r\n        0 0 4 ];\r\nassert(isequal(your_fcn_name(a),b))\r\n\r\n\r\n%%\r\na = [1 0 8 9 14];\r\nb =[ 1     0     1     1     1\r\n     0     0     2     2     2\r\n     0     0     3     3     3\r\n     0     0     4     4     4\r\n     0     0     5     5     5\r\n     0     0     6     6     6\r\n     0     0     7     7     7\r\n     0     0     8     8     8\r\n     0     0     0     9     9\r\n     0     0     0     0    10\r\n     0     0     0     0    11\r\n     0     0     0     0    12\r\n     0     0     0     0    13\r\n     0     0     0     0    14];\r\nassert(isequal(your_fcn_name(a),b))\r\n\r\n%%\r\n a = [ 4 2 4 ];\r\nb =[ 1     1     1\r\n     2     2     2\r\n     3     0     3\r\n     4     0     4];\r\nassert(isequal(your_fcn_name(a),b))\r\n\r\n%% one value\r\na= 1;\r\n\r\nassert(isequal(your_fcn_name(a),1))\r\n\r\n%% empty vector \r\na = 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