{"group":{"id":1,"name":"Community","lockable":false,"created_at":"2012-01-18T18:02:15.000Z","updated_at":"2025-12-14T01:33:56.000Z","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":"2025-12-14T00:00:00.000Z","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":42770,"title":"Create formatted value string Cell array of a vector","description":"This Challenge is to create a cell array that contains strings of vector components in a given format.\r\n\r\nc=vector2formattedstringCA(fmt,v)\r\n\r\n*Example:*\r\n\r\n  fmt='%.3f'; v=[-3.1416 -1.5708 0 1.5708  3.1416]\r\n  c={ '-3.142'    '-1.571'    '0.000'    '1.571'    '3.142'}\r\n\r\n*References:*\r\n\r\nI observed an intriguing function usage by LY Cao and googled it to \u003chttp://undocumentedmatlab.com/blog/sprintfc-undocumented-helper-function Undocumented Matlab\u003e .","description_html":"\u003cp\u003eThis Challenge is to create a cell array that contains strings of vector components in a given format.\u003c/p\u003e\u003cp\u003ec=vector2formattedstringCA(fmt,v)\u003c/p\u003e\u003cp\u003e\u003cb\u003eExample:\u003c/b\u003e\u003c/p\u003e\u003cpre class=\"language-matlab\"\u003efmt='%.3f'; v=[-3.1416 -1.5708 0 1.5708  3.1416]\r\nc={ '-3.142'    '-1.571'    '0.000'    '1.571'    '3.142'}\r\n\u003c/pre\u003e\u003cp\u003e\u003cb\u003eReferences:\u003c/b\u003e\u003c/p\u003e\u003cp\u003eI observed an intriguing function usage by LY Cao and googled it to \u003ca href = \"http://undocumentedmatlab.com/blog/sprintfc-undocumented-helper-function\"\u003eUndocumented Matlab\u003c/a\u003e .\u003c/p\u003e","function_template":"function c=vector2formattedstringCA(fmt,v)\r\n% Create string cell array of vector v of format fmt\r\n  c={};\r\nend","test_suite":"%%\r\nfmt='%.3f'; \r\nv=[-3.1416 -1.5708 0 1.5708  3.1416];\r\nc_exp={ '-3.142'    '-1.571'    '0.000'    '1.571'    '3.142'};\r\nassert(isequal(vector2formattedstringCA(fmt,v),c_exp))\r\n%%\r\nfmt='%.6f';\r\nv=rand(1,5);\r\nc_exp={};\r\nfor data=v\r\n c_exp{end+1} = sprintf(fmt,data);\r\nend\r\nassert(isequal(vector2formattedstringCA(fmt,v),c_exp))\r\n%%\r\nfmt='%i';\r\nv=rand(1,10)*100;\r\nc_exp={};\r\nfor data=v\r\n c_exp{end+1} = sprintf(fmt,data);\r\nend\r\nassert(isequal(vector2formattedstringCA(fmt,v),c_exp))\r\n","published":true,"deleted":false,"likes_count":1,"comments_count":0,"created_by":3097,"edited_by":null,"edited_at":null,"deleted_by":null,"deleted_at":null,"solvers_count":31,"test_suite_updated_at":null,"rescore_all_solutions":false,"group_id":1,"created_at":"2016-03-13T15:14:25.000Z","updated_at":"2026-02-27T14:20:26.000Z","published_at":"2016-03-13T15:26:08.000Z","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\u003eThis Challenge is to create a cell array that contains strings of vector components in a given format.\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\u003ec=vector2formattedstringCA(fmt,v)\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[fmt='%.3f'; v=[-3.1416 -1.5708 0 1.5708  3.1416]\\nc={ '-3.142'    '-1.571'    '0.000'    '1.571'    '3.142'}]]\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:rPr\u003e\u003cw:b/\u003e\u003c/w:rPr\u003e\u003cw:t\u003eReferences:\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\u003eI observed an intriguing function usage by LY Cao and googled it to\u003c/w:t\u003e\u003c/w:r\u003e\u003cw:r\u003e\u003cw:t\u003e \u003c/w:t\u003e\u003c/w:r\u003e\u003cw:hyperlink w:docLocation=\\\"http://undocumentedmatlab.com/blog/sprintfc-undocumented-helper-function\\\"\u003e\u003cw:r\u003e\u003cw:t\u003eUndocumented Matlab\u003c/w:t\u003e\u003c/w:r\u003e\u003c/w:hyperlink\u003e\u003cw:r\u003e\u003cw:t\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":52552,"title":"Undocumented MATLAB tricks No. 1 - Save a function-returned struct","description":"Often we face the case when we want to save a function-returned struct to a mat file with each of its field as individual variables.\r\nFor example, the function returns a struct of 3 fields: a=1,b=2,c=3. Then you should save a file with 3 variables: a=1,b=2,c=3.\r\nThis problem is easy to just solve, but could be difficult to find the best solution of size 13! You may need some undocumented tricks.","description_html":"\u003cdiv style = \"text-align: start; line-height: 20.44px; min-height: 0px; white-space: normal; color: rgb(0, 0, 0); font-family: Menlo, Monaco, Consolas, monospace; font-style: normal; font-size: 14px; font-weight: 400; text-decoration: none solid rgb(0, 0, 0); white-space: normal; \"\u003e\u003cdiv style=\"block-size: 144px; display: block; min-width: 0px; padding-block-start: 0px; padding-top: 0px; perspective-origin: 407px 72px; transform-origin: 407px 72px; vertical-align: baseline; \"\u003e\u003cdiv style=\"block-size: 42px; font-family: Helvetica, Arial, sans-serif; line-height: 21px; margin-block-end: 9px; margin-block-start: 2px; margin-bottom: 9px; margin-inline-end: 10px; margin-inline-start: 4px; margin-left: 4px; margin-right: 10px; margin-top: 2px; perspective-origin: 384px 21px; text-align: left; transform-origin: 384px 21px; white-space: pre-wrap; margin-left: 4px; margin-top: 2px; margin-bottom: 9px; margin-right: 10px; \"\u003e\u003cspan style=\"block-size: auto; display: inline; margin-block-end: 0px; margin-block-start: 0px; margin-bottom: 0px; margin-inline-end: 0px; margin-inline-start: 0px; margin-left: 0px; margin-right: 0px; margin-top: 0px; perspective-origin: 0px 0px; transform-origin: 0px 0px; \"\u003e\u003cspan style=\"\"\u003eOften we face the case when we want to save a function-returned struct to a mat file with each of its field as individual variables.\u003c/span\u003e\u003c/span\u003e\u003c/div\u003e\u003cdiv style=\"block-size: 42px; font-family: Helvetica, Arial, sans-serif; line-height: 21px; margin-block-end: 9px; margin-block-start: 2px; margin-bottom: 9px; margin-inline-end: 10px; margin-inline-start: 4px; margin-left: 4px; margin-right: 10px; margin-top: 2px; perspective-origin: 384px 21px; text-align: left; transform-origin: 384px 21px; white-space: pre-wrap; margin-left: 4px; margin-top: 2px; margin-bottom: 9px; margin-right: 10px; \"\u003e\u003cspan style=\"block-size: auto; display: inline; margin-block-end: 0px; margin-block-start: 0px; margin-bottom: 0px; margin-inline-end: 0px; margin-inline-start: 0px; margin-left: 0px; margin-right: 0px; margin-top: 0px; perspective-origin: 0px 0px; transform-origin: 0px 0px; \"\u003e\u003cspan style=\"\"\u003eFor example, the function returns a struct of 3 fields: a=1,b=2,c=3. Then you should save a file with 3 variables: a=1,b=2,c=3.\u003c/span\u003e\u003c/span\u003e\u003c/div\u003e\u003cdiv style=\"block-size: 42px; font-family: Helvetica, Arial, sans-serif; line-height: 21px; margin-block-end: 9px; margin-block-start: 2px; margin-bottom: 9px; margin-inline-end: 10px; margin-inline-start: 4px; margin-left: 4px; margin-right: 10px; margin-top: 2px; perspective-origin: 384px 21px; text-align: left; transform-origin: 384px 21px; white-space: pre-wrap; margin-left: 4px; margin-top: 2px; margin-bottom: 9px; margin-right: 10px; \"\u003e\u003cspan style=\"block-size: auto; display: inline; margin-block-end: 0px; margin-block-start: 0px; margin-bottom: 0px; margin-inline-end: 0px; margin-inline-start: 0px; margin-left: 0px; margin-right: 0px; margin-top: 0px; perspective-origin: 0px 0px; transform-origin: 0px 0px; \"\u003e\u003cspan style=\"\"\u003eThis problem is easy to just solve, but could be difficult to find the best solution of size 13! You may need some undocumented tricks.\u003c/span\u003e\u003c/span\u003e\u003c/div\u003e\u003c/div\u003e\u003c/div\u003e","function_template":"function ans=SaveStruct(FilePath,Function)\r\n%No need to give any return values. It's just cody's stupid validation rule that does not allow a function template without a return value.\r\nend","test_suite":"%%\r\n% Generate random variable names and values\r\nValues=unique(randi(100,1,100));\r\nFields=\"F\"+string(Values);\r\nInput=[num2cell(Fields);num2cell(Values)];\r\nStructToSave=struct(Input{:});\r\n% Save the struct\r\nSaveStruct(\"Struct.mat\",@()StructToSave);\r\n% Check if the file matches the struct\r\nassert(isequal(StructToSave,load(\"Struct.mat\")));","published":true,"deleted":false,"likes_count":0,"comments_count":0,"created_by":362068,"edited_by":null,"edited_at":null,"deleted_by":null,"deleted_at":null,"solvers_count":5,"test_suite_updated_at":"2021-08-16T09:54:05.000Z","rescore_all_solutions":false,"group_id":1,"created_at":"2021-08-16T09:34:52.000Z","updated_at":"2021-08-16T09:55:59.000Z","published_at":"2021-08-16T09:54:05.000Z","restored_at":null,"restored_by":null,"spam":false,"simulink":false,"admin_reviewed":false,"description_opc":"{\"parts\":[{\"partUri\":\"/matlab/document.xml\",\"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\u003cw:jc w:val=\\\"left\\\"/\u003e\u003c/w:pPr\u003e\u003cw:r\u003e\u003cw:t\u003eOften we face the case when we want to save a function-returned struct to a mat file with each of its field as individual variables.\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\u003eFor example, the function returns a struct of 3 fields: a=1,b=2,c=3. Then you should save a file with 3 variables: a=1,b=2,c=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\u003eThis problem is easy to just solve, but could be difficult to find the best solution of size 13! You may need some undocumented tricks.\u003c/w:t\u003e\u003c/w:r\u003e\u003c/w:p\u003e\u003c/w:body\u003e\u003c/w:document\u003e\",\"relationship\":null}],\"relationships\":[{\"relationshipType\":\"http://schemas.mathworks.com/matlab/code/2013/relationships/document\",\"target\":\"/matlab/document.xml\",\"relationshipId\":\"rId1\"}]}"}],"problem_search":{"errors":[],"problems":[{"id":42770,"title":"Create formatted value string Cell array of a vector","description":"This Challenge is to create a cell array that contains strings of vector components in a given format.\r\n\r\nc=vector2formattedstringCA(fmt,v)\r\n\r\n*Example:*\r\n\r\n  fmt='%.3f'; v=[-3.1416 -1.5708 0 1.5708  3.1416]\r\n  c={ '-3.142'    '-1.571'    '0.000'    '1.571'    '3.142'}\r\n\r\n*References:*\r\n\r\nI observed an intriguing function usage by LY Cao and googled it to \u003chttp://undocumentedmatlab.com/blog/sprintfc-undocumented-helper-function Undocumented Matlab\u003e .","description_html":"\u003cp\u003eThis Challenge is to create a cell array that contains strings of vector components in a given format.\u003c/p\u003e\u003cp\u003ec=vector2formattedstringCA(fmt,v)\u003c/p\u003e\u003cp\u003e\u003cb\u003eExample:\u003c/b\u003e\u003c/p\u003e\u003cpre class=\"language-matlab\"\u003efmt='%.3f'; v=[-3.1416 -1.5708 0 1.5708  3.1416]\r\nc={ '-3.142'    '-1.571'    '0.000'    '1.571'    '3.142'}\r\n\u003c/pre\u003e\u003cp\u003e\u003cb\u003eReferences:\u003c/b\u003e\u003c/p\u003e\u003cp\u003eI observed an intriguing function usage by LY Cao and googled it to \u003ca href = \"http://undocumentedmatlab.com/blog/sprintfc-undocumented-helper-function\"\u003eUndocumented Matlab\u003c/a\u003e .\u003c/p\u003e","function_template":"function c=vector2formattedstringCA(fmt,v)\r\n% Create string cell array of vector v of format fmt\r\n  c={};\r\nend","test_suite":"%%\r\nfmt='%.3f'; \r\nv=[-3.1416 -1.5708 0 1.5708  3.1416];\r\nc_exp={ '-3.142'    '-1.571'    '0.000'    '1.571'    '3.142'};\r\nassert(isequal(vector2formattedstringCA(fmt,v),c_exp))\r\n%%\r\nfmt='%.6f';\r\nv=rand(1,5);\r\nc_exp={};\r\nfor data=v\r\n c_exp{end+1} = sprintf(fmt,data);\r\nend\r\nassert(isequal(vector2formattedstringCA(fmt,v),c_exp))\r\n%%\r\nfmt='%i';\r\nv=rand(1,10)*100;\r\nc_exp={};\r\nfor data=v\r\n c_exp{end+1} = sprintf(fmt,data);\r\nend\r\nassert(isequal(vector2formattedstringCA(fmt,v),c_exp))\r\n","published":true,"deleted":false,"likes_count":1,"comments_count":0,"created_by":3097,"edited_by":null,"edited_at":null,"deleted_by":null,"deleted_at":null,"solvers_count":31,"test_suite_updated_at":null,"rescore_all_solutions":false,"group_id":1,"created_at":"2016-03-13T15:14:25.000Z","updated_at":"2026-02-27T14:20:26.000Z","published_at":"2016-03-13T15:26:08.000Z","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\u003eThis Challenge is to create a cell array that contains strings of vector components in a given format.\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\u003ec=vector2formattedstringCA(fmt,v)\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[fmt='%.3f'; v=[-3.1416 -1.5708 0 1.5708  3.1416]\\nc={ '-3.142'    '-1.571'    '0.000'    '1.571'    '3.142'}]]\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:rPr\u003e\u003cw:b/\u003e\u003c/w:rPr\u003e\u003cw:t\u003eReferences:\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\u003eI observed an intriguing function usage by LY Cao and googled it to\u003c/w:t\u003e\u003c/w:r\u003e\u003cw:r\u003e\u003cw:t\u003e \u003c/w:t\u003e\u003c/w:r\u003e\u003cw:hyperlink w:docLocation=\\\"http://undocumentedmatlab.com/blog/sprintfc-undocumented-helper-function\\\"\u003e\u003cw:r\u003e\u003cw:t\u003eUndocumented Matlab\u003c/w:t\u003e\u003c/w:r\u003e\u003c/w:hyperlink\u003e\u003cw:r\u003e\u003cw:t\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":52552,"title":"Undocumented MATLAB tricks No. 1 - Save a function-returned struct","description":"Often we face the case when we want to save a function-returned struct to a mat file with each of its field as individual variables.\r\nFor example, the function returns a struct of 3 fields: a=1,b=2,c=3. Then you should save a file with 3 variables: a=1,b=2,c=3.\r\nThis problem is easy to just solve, but could be difficult to find the best solution of size 13! 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