{"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":44676,"title":"Mean = Standard Deviation","description":"Create a series with following properties;\r\n\r\n# All of the members should be positive integer\r\n# Mean of the series should be integer\r\n# Standard deviation of the series should be integer (use a normalization factor of N instead of N-1)\r\n# Mean should be equal to standard deviation\r\n\r\nFor example if input is 6, you can return the following series;\r\n\r\n  out = [12 44 2 24 2 6]\r\n\r\n  mean(out) = 15;\r\n  std(out,1) = 15;\r\n  \r\nAnother example; if input is 4, a possible solution;\r\n\r\n  out = [24 2 2 48];\r\n  mean(out) = 19;\r\n  std(out,1) = 19;\r\n\r\n  ","description_html":"\u003cp\u003eCreate a series with following properties;\u003c/p\u003e\u003col\u003e\u003cli\u003eAll of the members should be positive integer\u003c/li\u003e\u003cli\u003eMean of the series should be integer\u003c/li\u003e\u003cli\u003eStandard deviation of the series should be integer (use a normalization factor of N instead of N-1)\u003c/li\u003e\u003cli\u003eMean should be equal to standard deviation\u003c/li\u003e\u003c/ol\u003e\u003cp\u003eFor example if input is 6, you can return the following series;\u003c/p\u003e\u003cpre class=\"language-matlab\"\u003eout = [12 44 2 24 2 6]\r\n\u003c/pre\u003e\u003cpre class=\"language-matlab\"\u003emean(out) = 15;\r\nstd(out,1) = 15;\r\n\u003c/pre\u003e\u003cp\u003eAnother example; if input is 4, a possible solution;\u003c/p\u003e\u003cpre class=\"language-matlab\"\u003eout = [24 2 2 48];\r\nmean(out) = 19;\r\nstd(out,1) = 19;\r\n\u003c/pre\u003e","function_template":"function y = meanEqualsStd(x)\r\n  y = x;\r\nend","test_suite":"%%\r\nfor idx = 5:50\r\n    x = idx;\r\n    Series = meanEqualsStd(x);\r\n    mSeries = mean(Series);\r\n    sSeries = std(Series,1);\r\n    assert(length(Series)==x);\r\n    assert(round(mSeries)==mSeries);\r\n    assert(round(sSeries)==sSeries);\r\n    assert(all(round(Series) == Series));\r\n    assert(all(round(Series) \u003e= 1));\r\n    assert(mSeries == sSeries);\r\nend\r\n\r\n%%\r\nfiletext = fileread('meanEqualsStd.m');\r\nassert(isempty(strfind(filetext, 'echo')))\r\nassert(isempty(strfind(filetext, 'assert')))","published":true,"deleted":false,"likes_count":5,"comments_count":11,"created_by":8703,"edited_by":null,"edited_at":null,"deleted_by":null,"deleted_at":null,"solvers_count":11,"test_suite_updated_at":"2018-06-14T07:03:27.000Z","rescore_all_solutions":true,"group_id":1,"created_at":"2018-06-07T01:30:24.000Z","updated_at":"2026-05-24T17:00:01.000Z","published_at":"2018-06-07T01:30:24.000Z","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\u003eCreate a series with following properties;\u003c/w:t\u003e\u003c/w:r\u003e\u003c/w:p\u003e\u003cw:p\u003e\u003cw:pPr\u003e\u003cw:pStyle w:val=\\\"ListParagraph\\\"/\u003e\u003cw:numPr\u003e\u003cw:numId w:val=\\\"2\\\"/\u003e\u003c/w:numPr\u003e\u003c/w:pPr\u003e\u003cw:r\u003e\u003cw:t\u003eAll of the members should be positive integer\u003c/w:t\u003e\u003c/w:r\u003e\u003c/w:p\u003e\u003cw:p\u003e\u003cw:pPr\u003e\u003cw:pStyle w:val=\\\"ListParagraph\\\"/\u003e\u003cw:numPr\u003e\u003cw:numId w:val=\\\"2\\\"/\u003e\u003c/w:numPr\u003e\u003c/w:pPr\u003e\u003cw:r\u003e\u003cw:t\u003eMean of the series should be integer\u003c/w:t\u003e\u003c/w:r\u003e\u003c/w:p\u003e\u003cw:p\u003e\u003cw:pPr\u003e\u003cw:pStyle w:val=\\\"ListParagraph\\\"/\u003e\u003cw:numPr\u003e\u003cw:numId w:val=\\\"2\\\"/\u003e\u003c/w:numPr\u003e\u003c/w:pPr\u003e\u003cw:r\u003e\u003cw:t\u003eStandard deviation of the series should be integer (use a normalization factor of N instead of N-1)\u003c/w:t\u003e\u003c/w:r\u003e\u003c/w:p\u003e\u003cw:p\u003e\u003cw:pPr\u003e\u003cw:pStyle w:val=\\\"ListParagraph\\\"/\u003e\u003cw:numPr\u003e\u003cw:numId w:val=\\\"2\\\"/\u003e\u003c/w:numPr\u003e\u003c/w:pPr\u003e\u003cw:r\u003e\u003cw:t\u003eMean should be equal to standard deviation\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 if input is 6, you can return the following series;\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[out = [12 44 2 24 2 6]\\n\\nmean(out) = 15;\\nstd(out,1) = 15;]]\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\u003eAnother example; if input is 4, a possible solution;\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[out = [24 2 2 48];\\nmean(out) = 19;\\nstd(out,1) = 19;]]\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":{"problems":[{"id":44676,"title":"Mean = Standard Deviation","description":"Create a series with following properties;\r\n\r\n# All of the members should be positive integer\r\n# Mean of the series should be integer\r\n# Standard deviation of the series should be integer (use a normalization factor of N instead of N-1)\r\n# Mean should be equal to standard deviation\r\n\r\nFor example if input is 6, you can return the following series;\r\n\r\n  out = [12 44 2 24 2 6]\r\n\r\n  mean(out) = 15;\r\n  std(out,1) = 15;\r\n  \r\nAnother example; if input is 4, a possible solution;\r\n\r\n  out = [24 2 2 48];\r\n  mean(out) = 19;\r\n  std(out,1) = 19;\r\n\r\n  ","description_html":"\u003cp\u003eCreate a series with following properties;\u003c/p\u003e\u003col\u003e\u003cli\u003eAll of the members should be positive integer\u003c/li\u003e\u003cli\u003eMean of the series should be integer\u003c/li\u003e\u003cli\u003eStandard deviation of the series should be integer (use a normalization factor of N instead of N-1)\u003c/li\u003e\u003cli\u003eMean should be equal to standard deviation\u003c/li\u003e\u003c/ol\u003e\u003cp\u003eFor example if input is 6, you can return the following series;\u003c/p\u003e\u003cpre class=\"language-matlab\"\u003eout = [12 44 2 24 2 6]\r\n\u003c/pre\u003e\u003cpre class=\"language-matlab\"\u003emean(out) = 15;\r\nstd(out,1) = 15;\r\n\u003c/pre\u003e\u003cp\u003eAnother example; if input is 4, a possible solution;\u003c/p\u003e\u003cpre class=\"language-matlab\"\u003eout = [24 2 2 48];\r\nmean(out) = 19;\r\nstd(out,1) = 19;\r\n\u003c/pre\u003e","function_template":"function y = meanEqualsStd(x)\r\n  y = x;\r\nend","test_suite":"%%\r\nfor idx = 5:50\r\n    x = idx;\r\n    Series = meanEqualsStd(x);\r\n    mSeries = mean(Series);\r\n    sSeries = std(Series,1);\r\n    assert(length(Series)==x);\r\n    assert(round(mSeries)==mSeries);\r\n    assert(round(sSeries)==sSeries);\r\n    assert(all(round(Series) == Series));\r\n    assert(all(round(Series) \u003e= 1));\r\n    assert(mSeries == sSeries);\r\nend\r\n\r\n%%\r\nfiletext = fileread('meanEqualsStd.m');\r\nassert(isempty(strfind(filetext, 'echo')))\r\nassert(isempty(strfind(filetext, 'assert')))","published":true,"deleted":false,"likes_count":5,"comments_count":11,"created_by":8703,"edited_by":null,"edited_at":null,"deleted_by":null,"deleted_at":null,"solvers_count":11,"test_suite_updated_at":"2018-06-14T07:03:27.000Z","rescore_all_solutions":true,"group_id":1,"created_at":"2018-06-07T01:30:24.000Z","updated_at":"2026-05-24T17:00:01.000Z","published_at":"2018-06-07T01:30:24.000Z","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\u003eCreate a series with following properties;\u003c/w:t\u003e\u003c/w:r\u003e\u003c/w:p\u003e\u003cw:p\u003e\u003cw:pPr\u003e\u003cw:pStyle w:val=\\\"ListParagraph\\\"/\u003e\u003cw:numPr\u003e\u003cw:numId w:val=\\\"2\\\"/\u003e\u003c/w:numPr\u003e\u003c/w:pPr\u003e\u003cw:r\u003e\u003cw:t\u003eAll of the members should be positive integer\u003c/w:t\u003e\u003c/w:r\u003e\u003c/w:p\u003e\u003cw:p\u003e\u003cw:pPr\u003e\u003cw:pStyle w:val=\\\"ListParagraph\\\"/\u003e\u003cw:numPr\u003e\u003cw:numId w:val=\\\"2\\\"/\u003e\u003c/w:numPr\u003e\u003c/w:pPr\u003e\u003cw:r\u003e\u003cw:t\u003eMean of the series should be integer\u003c/w:t\u003e\u003c/w:r\u003e\u003c/w:p\u003e\u003cw:p\u003e\u003cw:pPr\u003e\u003cw:pStyle w:val=\\\"ListParagraph\\\"/\u003e\u003cw:numPr\u003e\u003cw:numId w:val=\\\"2\\\"/\u003e\u003c/w:numPr\u003e\u003c/w:pPr\u003e\u003cw:r\u003e\u003cw:t\u003eStandard deviation of the series should be integer (use a normalization factor of N instead of N-1)\u003c/w:t\u003e\u003c/w:r\u003e\u003c/w:p\u003e\u003cw:p\u003e\u003cw:pPr\u003e\u003cw:pStyle w:val=\\\"ListParagraph\\\"/\u003e\u003cw:numPr\u003e\u003cw:numId w:val=\\\"2\\\"/\u003e\u003c/w:numPr\u003e\u003c/w:pPr\u003e\u003cw:r\u003e\u003cw:t\u003eMean should be equal to standard deviation\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 if input is 6, you can return the following series;\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[out = [12 44 2 24 2 6]\\n\\nmean(out) = 15;\\nstd(out,1) = 15;]]\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\u003eAnother example; if input is 4, a possible solution;\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[out = [24 2 2 48];\\nmean(out) = 19;\\nstd(out,1) = 19;]]\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\"}]}"}],"errors":[],"facets":[[{"value":"Probability \u0026 Stats","count":1,"selected":false}],[{"value":"hard","count":1,"selected":false}]],"term":"tag:\"standard deviation\"","page":1,"per_page":50,"sort":"map(difficulty_value,0,0,999) asc"}}