{"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":42265,"title":"Test if a number is numeric or not","description":"Test if a number is numeric or not","description_html":"\u003cp\u003eTest if a number is numeric or not\u003c/p\u003e","function_template":"function y = numeri(x)\r\n  y = numeri;\r\nend","test_suite":"%%\r\nx = [1 ,2 ,3 ,4];\r\ny = 1;\r\nassert(isequal(numeri(x),y))\r\n\r\n%%\r\nx = [1 ,2 ,3 ,'a'];\r\ny = 0;\r\nassert(isequal(numeri(x),y))\r\n","published":true,"deleted":false,"likes_count":1,"comments_count":1,"created_by":38003,"edited_by":null,"edited_at":null,"deleted_by":null,"deleted_at":null,"solvers_count":141,"test_suite_updated_at":null,"rescore_all_solutions":false,"group_id":1,"created_at":"2015-04-24T10:12:28.000Z","updated_at":"2026-02-18T09:45:19.000Z","published_at":"2015-04-24T10:12:33.000Z","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\u003eTest if a number is numeric or not\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":44623,"title":"Basic matlab numeric and string manipulations","description":"If entered input (n) is _numeric_ , compute its *log to the base (n+2)* , \r\n\r\nif it is a _lower case_ alphabet, *convert it to its numeric ascii value* , \r\n\r\nif it is an upper case character, create a string with '!' *concatenated* to the value 'n'\r\nExample: 'A' will become 'A!'\r\n\r\nelse return the input as is","description_html":"\u003cp\u003eIf entered input (n) is \u003ci\u003enumeric\u003c/i\u003e , compute its \u003cb\u003elog to the base (n+2)\u003c/b\u003e ,\u003c/p\u003e\u003cp\u003eif it is a \u003ci\u003elower case\u003c/i\u003e alphabet, \u003cb\u003econvert it to its numeric ascii value\u003c/b\u003e ,\u003c/p\u003e\u003cp\u003eif it is an upper case character, create a string with '!' \u003cb\u003econcatenated\u003c/b\u003e to the value 'n'\r\nExample: 'A' will become 'A!'\u003c/p\u003e\u003cp\u003eelse return the input as is\u003c/p\u003e","function_template":"function y = manipulate(x)\r\n  y = x;\r\nend","test_suite":"%%\r\nx = 'p';\r\ny_correct = 112;\r\nassert(isequal(manipulate(x),y_correct))\r\n\r\n%%\r\nx = 5;\r\ny_correct = log(x)/log(7);\r\nassert(isequal(manipulate(x),y_correct))\r\n\r\n%%\r\nx = 'A';\r\ny_correct = 'A!';\r\nassert(isequal(manipulate(x),y_correct))\r\n\r\n%%\r\nx = '!';\r\ny_correct = '!';\r\nassert(isequal(manipulate(x),y_correct))","published":true,"deleted":false,"likes_count":0,"comments_count":0,"created_by":171559,"edited_by":null,"edited_at":null,"deleted_by":null,"deleted_at":null,"solvers_count":41,"test_suite_updated_at":null,"rescore_all_solutions":false,"group_id":1,"created_at":"2018-04-21T04:14:55.000Z","updated_at":"2026-03-04T14:29:39.000Z","published_at":"2018-04-21T04:14:55.000Z","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\u003eIf entered input (n) is\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:i/\u003e\u003c/w:rPr\u003e\u003cw:t\u003enumeric\u003c/w:t\u003e\u003c/w:r\u003e\u003cw:r\u003e\u003cw:t\u003e , compute its\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\u003elog to the base (n+2)\u003c/w:t\u003e\u003c/w:r\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\u003c/w:pPr\u003e\u003cw:r\u003e\u003cw:t\u003eif it is a\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:i/\u003e\u003c/w:rPr\u003e\u003cw:t\u003elower case\u003c/w:t\u003e\u003c/w:r\u003e\u003cw:r\u003e\u003cw:t\u003e alphabet,\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\u003econvert it to its numeric ascii value\u003c/w:t\u003e\u003c/w:r\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\u003c/w:pPr\u003e\u003cw:r\u003e\u003cw:t\u003eif it is an upper case character, create a string with '!'\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\u003econcatenated\u003c/w:t\u003e\u003c/w:r\u003e\u003cw:r\u003e\u003cw:t\u003e to the value 'n' Example: 'A' will become 'A!'\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\u003eelse return the input as is\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":43285,"title":"Solve equation numerically","description":"\r\ny'=y\r\n\r\nIn order to solve equation using computer, numerical analysis are needed. 1st order Euler's method is one of the method. above equation can be expressed as\r\n\r\ny(i+1)=y(i)+h*y(i) \r\n\r\ny(1)=1\r\n\r\nCalculate y(10) using h=0.1. Inputs are y(1) and h.\r\n\r\nhttps://en.wikipedia.org/wiki/Euler_method\r\n","description_html":"\u003cp\u003ey'=y\u003c/p\u003e\u003cp\u003eIn order to solve equation using computer, numerical analysis are needed. 1st order Euler's method is one of the method. above equation can be expressed as\u003c/p\u003e\u003cp\u003ey(i+1)=y(i)+h*y(i)\u003c/p\u003e\u003cp\u003ey(1)=1\u003c/p\u003e\u003cp\u003eCalculate y(10) using h=0.1. Inputs are y(1) and h.\u003c/p\u003e\u003cp\u003ehttps://en.wikipedia.org/wiki/Euler_method\u003c/p\u003e","function_template":"function z = e1solver(h,y1)\r\n    y(1)=y1\r\n    \r\n    z =\r\nend","test_suite":"%%\r\nh=0.1\r\ny1=1\r\ny_correct = 2.3579;\r\nassert(abs(e1solver(h,y1)-y_correct)\u003c0.01)\r\n\r\n%%\r\nclc\r\nclear\r\nh=0.1\r\ny1=2\r\ny_correct = 4.7159;\r\nassert(abs(e1solver(h,y1)-y_correct)\u003c0.01)\r\n","published":true,"deleted":false,"likes_count":3,"comments_count":0,"created_by":33533,"edited_by":null,"edited_at":null,"deleted_by":null,"deleted_at":null,"solvers_count":57,"test_suite_updated_at":"2016-10-15T06:09:33.000Z","rescore_all_solutions":true,"group_id":1,"created_at":"2016-10-09T16:57:45.000Z","updated_at":"2026-03-11T13:42:36.000Z","published_at":"2016-10-09T16:59:12.000Z","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\u003ey'=y\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\u003eIn order to solve equation using computer, numerical analysis are needed. 1st order Euler's method is one of the method. above equation can be expressed as\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\u003ey(i+1)=y(i)+h*y(i)\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\u003ey(1)=1\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\u003eCalculate y(10) using h=0.1. Inputs are y(1) and h.\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\u003ehttps://en.wikipedia.org/wiki/Euler_method\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":42848,"title":"Lambert's W","description":"Matlab cody does not support lambertw. Try to create a lambert's w function yourself.\r\n\r\nLambert's W is the function that solves \r\n\r\n  x*exp(x) = A;\r\n\r\ngiven the value of A.\r\n\r\nRead more about Lambert's W \u003chttps://en.wikipedia.org/wiki/Lambert_W_function here\u003e.\r\n\r\nThough it is not particularly appropriate for this particular function, consider using \u003chttps://en.wikipedia.org/wiki/Newton's_method Newton-Raphson's method\u003e. Since all test cases will converge if starting with 0.\r\n\r\nThe relative tolerance for the result of x*exp(x) compared to A is 1e-5.","description_html":"\u003cp\u003eMatlab cody does not support lambertw. Try to create a lambert's w function yourself.\u003c/p\u003e\u003cp\u003eLambert's W is the function that solves\u003c/p\u003e\u003cpre class=\"language-matlab\"\u003ex*exp(x) = A;\r\n\u003c/pre\u003e\u003cp\u003egiven the value of A.\u003c/p\u003e\u003cp\u003eRead more about Lambert's W \u003ca href = \"https://en.wikipedia.org/wiki/Lambert_W_function\"\u003ehere\u003c/a\u003e.\u003c/p\u003e\u003cp\u003eThough it is not particularly appropriate for this particular function, consider using \u003ca href = \"https://en.wikipedia.org/wiki/Newton's_method\"\u003eNewton-Raphson's method\u003c/a\u003e. Since all test cases will converge if starting with 0.\u003c/p\u003e\u003cp\u003eThe relative tolerance for the result of x*exp(x) compared to A is 1e-5.\u003c/p\u003e","function_template":"function x = LambertW(A)\r\n  y = log(x);\r\nend","test_suite":"%%\r\nA = 1;\r\nx = LambertW(A);\r\nA_correct = x*exp(x);\r\nassert(abs(A_correct/A-1)\u003c1e-5)\r\n\r\n%%\r\nA = 6.8;\r\nx = LambertW(A);\r\nA_correct = x*exp(x);\r\nassert(abs(A_correct/A-1)\u003c1e-5)\r\n\r\n%%\r\nA = 14;\r\nx = LambertW(A);\r\nA_correct = x*exp(x);\r\nassert(abs(A_correct/A-1)\u003c1e-5)\r\n","published":true,"deleted":false,"likes_count":2,"comments_count":1,"created_by":12767,"edited_by":null,"edited_at":null,"deleted_by":null,"deleted_at":null,"solvers_count":52,"test_suite_updated_at":null,"rescore_all_solutions":false,"group_id":1,"created_at":"2016-05-05T14:37:35.000Z","updated_at":"2025-12-07T18:24:23.000Z","published_at":"2016-05-05T14:38:09.000Z","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\u003eMatlab cody does not support lambertw. Try to create a lambert's w function yourself.\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\u003eLambert's W is the function that solves\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[x*exp(x) = A;]]\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\u003egiven the value of A.\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\u003eRead more about Lambert's W\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=\\\"https://en.wikipedia.org/wiki/Lambert_W_function\\\"\u003e\u003cw:r\u003e\u003cw:t\u003ehere\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\u003cw:p\u003e\u003cw:pPr\u003e\u003cw:pStyle w:val=\\\"text\\\"/\u003e\u003c/w:pPr\u003e\u003cw:r\u003e\u003cw:t\u003eThough it is not particularly appropriate for this particular function, consider using\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=\\\"https://en.wikipedia.org/wiki/Newton's_method\\\"\u003e\u003cw:r\u003e\u003cw:t\u003eNewton-Raphson's method\u003c/w:t\u003e\u003c/w:r\u003e\u003c/w:hyperlink\u003e\u003cw:r\u003e\u003cw:t\u003e. Since all test cases will converge if starting with 0.\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\u003eThe relative tolerance for the result of x*exp(x) compared to A is 1e-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":{"errors":[],"problems":[{"id":42265,"title":"Test if a number is numeric or not","description":"Test if a number is numeric or not","description_html":"\u003cp\u003eTest if a number is numeric or not\u003c/p\u003e","function_template":"function y = numeri(x)\r\n  y = numeri;\r\nend","test_suite":"%%\r\nx = [1 ,2 ,3 ,4];\r\ny = 1;\r\nassert(isequal(numeri(x),y))\r\n\r\n%%\r\nx = [1 ,2 ,3 ,'a'];\r\ny = 0;\r\nassert(isequal(numeri(x),y))\r\n","published":true,"deleted":false,"likes_count":1,"comments_count":1,"created_by":38003,"edited_by":null,"edited_at":null,"deleted_by":null,"deleted_at":null,"solvers_count":141,"test_suite_updated_at":null,"rescore_all_solutions":false,"group_id":1,"created_at":"2015-04-24T10:12:28.000Z","updated_at":"2026-02-18T09:45:19.000Z","published_at":"2015-04-24T10:12:33.000Z","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\u003eTest if a number is numeric or not\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":44623,"title":"Basic matlab numeric and string manipulations","description":"If entered input (n) is _numeric_ , compute its *log to the base (n+2)* , \r\n\r\nif it is a _lower case_ alphabet, *convert it to its numeric ascii value* , \r\n\r\nif it is an upper case character, create a string with '!' *concatenated* to the value 'n'\r\nExample: 'A' will become 'A!'\r\n\r\nelse return the input as is","description_html":"\u003cp\u003eIf entered input (n) is \u003ci\u003enumeric\u003c/i\u003e , compute its \u003cb\u003elog to the base (n+2)\u003c/b\u003e ,\u003c/p\u003e\u003cp\u003eif it is a \u003ci\u003elower case\u003c/i\u003e alphabet, \u003cb\u003econvert it to its numeric ascii value\u003c/b\u003e ,\u003c/p\u003e\u003cp\u003eif it is an upper case character, create a string with '!' \u003cb\u003econcatenated\u003c/b\u003e to the value 'n'\r\nExample: 'A' will become 'A!'\u003c/p\u003e\u003cp\u003eelse return the input as is\u003c/p\u003e","function_template":"function y = manipulate(x)\r\n  y = x;\r\nend","test_suite":"%%\r\nx = 'p';\r\ny_correct = 112;\r\nassert(isequal(manipulate(x),y_correct))\r\n\r\n%%\r\nx = 5;\r\ny_correct = log(x)/log(7);\r\nassert(isequal(manipulate(x),y_correct))\r\n\r\n%%\r\nx = 'A';\r\ny_correct = 'A!';\r\nassert(isequal(manipulate(x),y_correct))\r\n\r\n%%\r\nx = '!';\r\ny_correct = '!';\r\nassert(isequal(manipulate(x),y_correct))","published":true,"deleted":false,"likes_count":0,"comments_count":0,"created_by":171559,"edited_by":null,"edited_at":null,"deleted_by":null,"deleted_at":null,"solvers_count":41,"test_suite_updated_at":null,"rescore_all_solutions":false,"group_id":1,"created_at":"2018-04-21T04:14:55.000Z","updated_at":"2026-03-04T14:29:39.000Z","published_at":"2018-04-21T04:14:55.000Z","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\u003eIf entered input (n) is\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:i/\u003e\u003c/w:rPr\u003e\u003cw:t\u003enumeric\u003c/w:t\u003e\u003c/w:r\u003e\u003cw:r\u003e\u003cw:t\u003e , compute its\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\u003elog to the base (n+2)\u003c/w:t\u003e\u003c/w:r\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\u003c/w:pPr\u003e\u003cw:r\u003e\u003cw:t\u003eif it is a\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:i/\u003e\u003c/w:rPr\u003e\u003cw:t\u003elower case\u003c/w:t\u003e\u003c/w:r\u003e\u003cw:r\u003e\u003cw:t\u003e alphabet,\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\u003econvert it to its numeric ascii value\u003c/w:t\u003e\u003c/w:r\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\u003c/w:pPr\u003e\u003cw:r\u003e\u003cw:t\u003eif it is an upper case character, create a string with '!'\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\u003econcatenated\u003c/w:t\u003e\u003c/w:r\u003e\u003cw:r\u003e\u003cw:t\u003e to the value 'n' Example: 'A' will become 'A!'\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\u003eelse return the input as is\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":43285,"title":"Solve equation numerically","description":"\r\ny'=y\r\n\r\nIn order to solve equation using computer, numerical analysis are needed. 1st order Euler's method is one of the method. above equation can be expressed as\r\n\r\ny(i+1)=y(i)+h*y(i) \r\n\r\ny(1)=1\r\n\r\nCalculate y(10) using h=0.1. Inputs are y(1) and h.\r\n\r\nhttps://en.wikipedia.org/wiki/Euler_method\r\n","description_html":"\u003cp\u003ey'=y\u003c/p\u003e\u003cp\u003eIn order to solve equation using computer, numerical analysis are needed. 1st order Euler's method is one of the method. above equation can be expressed as\u003c/p\u003e\u003cp\u003ey(i+1)=y(i)+h*y(i)\u003c/p\u003e\u003cp\u003ey(1)=1\u003c/p\u003e\u003cp\u003eCalculate y(10) using h=0.1. Inputs are y(1) and h.\u003c/p\u003e\u003cp\u003ehttps://en.wikipedia.org/wiki/Euler_method\u003c/p\u003e","function_template":"function z = e1solver(h,y1)\r\n    y(1)=y1\r\n    \r\n    z =\r\nend","test_suite":"%%\r\nh=0.1\r\ny1=1\r\ny_correct = 2.3579;\r\nassert(abs(e1solver(h,y1)-y_correct)\u003c0.01)\r\n\r\n%%\r\nclc\r\nclear\r\nh=0.1\r\ny1=2\r\ny_correct = 4.7159;\r\nassert(abs(e1solver(h,y1)-y_correct)\u003c0.01)\r\n","published":true,"deleted":false,"likes_count":3,"comments_count":0,"created_by":33533,"edited_by":null,"edited_at":null,"deleted_by":null,"deleted_at":null,"solvers_count":57,"test_suite_updated_at":"2016-10-15T06:09:33.000Z","rescore_all_solutions":true,"group_id":1,"created_at":"2016-10-09T16:57:45.000Z","updated_at":"2026-03-11T13:42:36.000Z","published_at":"2016-10-09T16:59:12.000Z","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\u003ey'=y\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\u003eIn order to solve equation using computer, numerical analysis are needed. 1st order Euler's method is one of the method. above equation can be expressed as\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\u003ey(i+1)=y(i)+h*y(i)\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\u003ey(1)=1\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\u003eCalculate y(10) using h=0.1. Inputs are y(1) and h.\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\u003ehttps://en.wikipedia.org/wiki/Euler_method\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":42848,"title":"Lambert's W","description":"Matlab cody does not support lambertw. Try to create a lambert's w function yourself.\r\n\r\nLambert's W is the function that solves \r\n\r\n  x*exp(x) = A;\r\n\r\ngiven the value of A.\r\n\r\nRead more about Lambert's W \u003chttps://en.wikipedia.org/wiki/Lambert_W_function here\u003e.\r\n\r\nThough it is not particularly appropriate for this particular function, consider using \u003chttps://en.wikipedia.org/wiki/Newton's_method Newton-Raphson's method\u003e. Since all test cases will converge if starting with 0.\r\n\r\nThe relative tolerance for the result of x*exp(x) compared to A is 1e-5.","description_html":"\u003cp\u003eMatlab cody does not support lambertw. Try to create a lambert's w function yourself.\u003c/p\u003e\u003cp\u003eLambert's W is the function that solves\u003c/p\u003e\u003cpre class=\"language-matlab\"\u003ex*exp(x) = A;\r\n\u003c/pre\u003e\u003cp\u003egiven the value of A.\u003c/p\u003e\u003cp\u003eRead more about Lambert's W \u003ca href = \"https://en.wikipedia.org/wiki/Lambert_W_function\"\u003ehere\u003c/a\u003e.\u003c/p\u003e\u003cp\u003eThough it is not particularly appropriate for this particular function, consider using \u003ca href = \"https://en.wikipedia.org/wiki/Newton's_method\"\u003eNewton-Raphson's method\u003c/a\u003e. Since all test cases will converge if starting with 0.\u003c/p\u003e\u003cp\u003eThe relative tolerance for the result of x*exp(x) compared to A is 1e-5.\u003c/p\u003e","function_template":"function x = LambertW(A)\r\n  y = log(x);\r\nend","test_suite":"%%\r\nA = 1;\r\nx = LambertW(A);\r\nA_correct = x*exp(x);\r\nassert(abs(A_correct/A-1)\u003c1e-5)\r\n\r\n%%\r\nA = 6.8;\r\nx = LambertW(A);\r\nA_correct = x*exp(x);\r\nassert(abs(A_correct/A-1)\u003c1e-5)\r\n\r\n%%\r\nA = 14;\r\nx = LambertW(A);\r\nA_correct = x*exp(x);\r\nassert(abs(A_correct/A-1)\u003c1e-5)\r\n","published":true,"deleted":false,"likes_count":2,"comments_count":1,"created_by":12767,"edited_by":null,"edited_at":null,"deleted_by":null,"deleted_at":null,"solvers_count":52,"test_suite_updated_at":null,"rescore_all_solutions":false,"group_id":1,"created_at":"2016-05-05T14:37:35.000Z","updated_at":"2025-12-07T18:24:23.000Z","published_at":"2016-05-05T14:38:09.000Z","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\u003eMatlab cody does not support lambertw. Try to create a lambert's w function yourself.\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\u003eLambert's W is the function that solves\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[x*exp(x) = A;]]\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\u003egiven the value of A.\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\u003eRead more about Lambert's W\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=\\\"https://en.wikipedia.org/wiki/Lambert_W_function\\\"\u003e\u003cw:r\u003e\u003cw:t\u003ehere\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\u003cw:p\u003e\u003cw:pPr\u003e\u003cw:pStyle w:val=\\\"text\\\"/\u003e\u003c/w:pPr\u003e\u003cw:r\u003e\u003cw:t\u003eThough it is not particularly appropriate for this particular function, consider using\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=\\\"https://en.wikipedia.org/wiki/Newton's_method\\\"\u003e\u003cw:r\u003e\u003cw:t\u003eNewton-Raphson's method\u003c/w:t\u003e\u003c/w:r\u003e\u003c/w:hyperlink\u003e\u003cw:r\u003e\u003cw:t\u003e. 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