{"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":42987,"title":"Roots of a quadratic equation.","description":"Calculate the roots of a quadratic equation, given coefficients a, b, and c, for the equation a*x^2 + b*x + c = 0.","description_html":"\u003cp\u003eCalculate the roots of a quadratic equation, given coefficients a, b, and c, for the equation a*x^2 + b*x + c = 0.\u003c/p\u003e","function_template":"function y = quadRoots(a,b,c)\r\n  y = a;\r\nend","test_suite":"%%\r\na=1;\r\nb=2;\r\nc=1;\r\ny_correct = [-1 -1];\r\nassert(norm(quadRoots(a,b,c)-y_correct) \u003c 10*eps)\r\n\r\n%%\r\na=1;\r\nb=-5;\r\nc=6;\r\ny_correct = [2 3];\r\nassert(norm(quadRoots(a,b,c)-y_correct) \u003c 10*eps)\r\n\r\n%%\r\na=1;\r\nb=5;\r\nc=6;\r\ny_correct = [-3 -2];\r\nassert(norm(quadRoots(a,b,c)-y_correct) \u003c 10*eps)\r\n\r\n%%\r\na=2;\r\nb=10;\r\nc=12;\r\ny_correct = [-3 -2];\r\nassert(norm(quadRoots(a,b,c)-y_correct) \u003c 10*eps)\r\n\r\n%%\r\na=1;\r\nb=19;\r\nc=90;\r\ny_correct = [-10 -9];\r\nassert(norm(quadRoots(a,b,c)-y_correct) \u003c 100*eps)\r\n","published":true,"deleted":false,"likes_count":5,"comments_count":6,"created_by":91311,"edited_by":null,"edited_at":null,"deleted_by":null,"deleted_at":null,"solvers_count":73,"test_suite_updated_at":"2016-10-02T01:45:25.000Z","rescore_all_solutions":false,"group_id":1,"created_at":"2016-09-16T10:45:13.000Z","updated_at":"2026-02-13T18:45:17.000Z","published_at":"2016-09-16T10:45:13.000Z","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\u003eCalculate the roots of a quadratic equation, given coefficients a, b, and c, for the equation a*x^2 + b*x + c = 0.\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":42923,"title":"Given the variable x as your input, multiply it by four, then divide it by two. Then put the result in y.","description":"If x = 5,\r\n\r\ny = 4*5/2 = 10","description_html":"\u003cp\u003eIf x = 5,\u003c/p\u003e\u003cp\u003ey = 4*5/2 = 10\u003c/p\u003e","function_template":"function y = your_fcn_name(x)\r\n  y = x;\r\nend","test_suite":"%%\r\nx = 5;\r\ny_correct = 10;\r\nassert(isequal(your_fcn_name(x),y_correct))\r\n","published":true,"deleted":false,"likes_count":0,"comments_count":0,"created_by":27348,"edited_by":null,"edited_at":null,"deleted_by":null,"deleted_at":null,"solvers_count":189,"test_suite_updated_at":null,"rescore_all_solutions":false,"group_id":1,"created_at":"2016-08-26T16:26:26.000Z","updated_at":"2026-02-10T18:23:48.000Z","published_at":"2016-08-26T16:26:26.000Z","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\u003eIf x = 5,\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 = 4*5/2 = 10\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":42931,"title":"Square root of a number","description":"Write a code that will output the square root of x.","description_html":"\u003cp\u003eWrite a code that will output the square root of x.\u003c/p\u003e","function_template":"function y = your_fcn_name(x)\r\n  y = x;\r\nend","test_suite":"%%\r\nx = 4;\r\ny_correct = 2;\r\nassert(isequal(your_fcn_name(x),y_correct))\r\n\r\n%%\r\nx = 81;\r\ny_correct = 9;\r\nassert(isequal(your_fcn_name(x),y_correct))\r\n","published":true,"deleted":false,"likes_count":1,"comments_count":1,"created_by":27348,"edited_by":null,"edited_at":null,"deleted_by":null,"deleted_at":null,"solvers_count":454,"test_suite_updated_at":null,"rescore_all_solutions":false,"group_id":1,"created_at":"2016-08-26T20:16:02.000Z","updated_at":"2026-03-15T14:33:26.000Z","published_at":"2016-08-26T20:16:02.000Z","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\u003eWrite a code that will output the square root of x.\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":42928,"title":"Area of a circle","description":"Given the radius x, y would be the area of a circle.\r\n\r\nPi = 3.1416","description_html":"\u003cp\u003eGiven the radius x, y would be the area of a circle.\u003c/p\u003e\u003cp\u003ePi = 3.1416\u003c/p\u003e","function_template":"function y = your_fcn_name(x)\r\n  y = ....;\r\nend","test_suite":"%%\r\nx = 3;\r\ny_correct = 28.2744;\r\nassert(isequal(your_fcn_name(x),y_correct))\r\n\r\n%%\r\nx = 2;\r\ny_correct = 12.5664;\r\nassert(isequal(your_fcn_name(x),y_correct))\r\n","published":true,"deleted":false,"likes_count":5,"comments_count":1,"created_by":27348,"edited_by":null,"edited_at":null,"deleted_by":null,"deleted_at":null,"solvers_count":588,"test_suite_updated_at":null,"rescore_all_solutions":false,"group_id":1,"created_at":"2016-08-26T19:59:08.000Z","updated_at":"2026-02-06T20:53:17.000Z","published_at":"2016-08-26T19:59:08.000Z","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\",\"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 the radius x, y would be the area of a circle.\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\u003ePi = 3.1416\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":42934,"title":"Log of a number","description":"Write a script that will give the log of x as output.","description_html":"\u003cp\u003eWrite a script that will give the log of x as output.\u003c/p\u003e","function_template":"function y = your_fcn_name(x)\r\n  y = x;\r\nend","test_suite":"%%\r\nx = 10;\r\ny_correct = 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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\u003eWrite a script that will give the log of x as output.\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":42932,"title":"If you have matrix A, create 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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\u003eUsing matlab, give the symbol that is associated with ASCii code 90.\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":2120,"title":"Rounding off numbers to n decimals","description":"Inspired by a mistake in one of the problems I created, I created this problem where you have to round off a floating point number to n decimals. There are 2 inputs to the function: x: floating point number and n: number of decimals which need to match with the given solutions.","description_html":"\u003cp\u003eInspired by a mistake in one of the problems I created, I created this problem where you have to round off a floating point number to n decimals. There are 2 inputs to the function: x: floating point number and n: number of decimals which need to match with the given solutions.\u003c/p\u003e","function_template":"function y = myround(x,n)\r\n  y = x;\r\nend","test_suite":"%%\r\nx = 1;\r\nn=1;\r\ny_correct = 1;\r\nassert(isequal(myround(x,n),y_correct))\r\n%%\r\nx = pi;\r\nn=5;\r\ny_correct = 3.14159;\r\nassert(isequal(myround(x,n),y_correct))\r\n%%\r\nx = 0.5*sqrt(2);\r\nn=6;\r\ny_correct = 0.707107;\r\nassert(isequal(myround(x,n),y_correct))\r\n%%\r\nx = exp(1);\r\nn=9;\r\ny_correct = 2.718281828;\r\nassert(isequal(myround(x,n),y_correct))\r\n%%\r\nx = 0.00123456;\r\nn=6;\r\ny_correct = 0.001235;\r\nassert(isequal(myround(x,n),y_correct))\r\n","published":true,"deleted":false,"likes_count":23,"comments_count":3,"created_by":20079,"edited_by":null,"edited_at":null,"deleted_by":null,"deleted_at":null,"solvers_count":5531,"test_suite_updated_at":"2014-01-15T04:17:27.000Z","rescore_all_solutions":false,"group_id":38,"created_at":"2014-01-15T04:03:48.000Z","updated_at":"2026-04-02T02:10:16.000Z","published_at":"2014-01-15T04:14:20.000Z","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\u003eInspired by a mistake in one of the problems I created, I created this problem where you have to round off a floating point number to n decimals. There are 2 inputs to the function: x: floating point number and n: number of decimals which need to match with the given solutions.\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":1325,"title":"Special matrix","description":"Make a square matrix with this shape. For n=4\r\n\r\nM =\r\n\r\n     1     1     0     0\r\n     1     0     1     0\r\n     0     1     0     1\r\n     0     0     1     1","description_html":"\u003cp\u003eMake a square matrix with this shape. For n=4\u003c/p\u003e\u003cp\u003eM =\u003c/p\u003e\u003cpre\u003e     1     1     0     0\r\n     1     0     1     0\r\n     0     1     0     1\r\n     0     0     1     1\u003c/pre\u003e","function_template":"function y = your_fcn_name(x)\r\n  y = x;\r\nend","test_suite":"%%\r\nx = 3;\r\ny_correct =  [1     1     0\r\n              1     0     1\r\n              0     1     1];\r\nassert(isequal(your_fcn_name(x),y_correct))\r\n\r\n%%\r\nx = 4;\r\ny_correct =  [     1     1     0     0\r\n                   1     0     1     0\r\n                   0     1     0     1\r\n                   0     0     1     1];\r\nassert(isequal(your_fcn_name(x),y_correct))\r\n\r\n%%\r\nx = 5;\r\ny_correct =  [     1     1     0     0     0\r\n                   1     0     1     0     0\r\n                   0     1     0     1     0\r\n                   0     0     1     0     1\r\n                   0     0     0     1     1];\r\nassert(isequal(your_fcn_name(x),y_correct))\r\n\r\n%%\r\nx = 6;\r\ny_correct =  [     1     1     0     0     0     0\r\n                   1     0     1     0     0     0\r\n                   0     1     0     1     0     0\r\n                   0     0     1     0     1     0\r\n                   0     0     0     1     0     1\r\n                   0     0     0     0     1     1];\r\nassert(isequal(your_fcn_name(x),y_correct))\r\n\r\n%%\r\nx = 18;\r\ny_correct =  [     1     1     0     0     0     0     0     0     0     0     0     0     0     0     0     0     0     0\r\n     1     0     1     0     0     0     0     0     0     0     0     0     0     0     0     0     0     0\r\n     0     1     0     1     0     0     0     0     0     0     0     0     0     0     0     0     0     0\r\n     0     0     1     0     1     0     0     0     0     0     0     0     0     0     0     0     0     0\r\n     0     0     0     1     0     1     0     0     0     0     0     0     0     0     0     0     0     0\r\n     0     0     0     0     1     0     1     0     0     0     0     0     0     0     0     0     0     0\r\n     0     0     0     0     0     1     0     1     0     0     0     0     0     0     0     0     0     0\r\n     0     0     0     0     0     0     1     0     1     0     0     0     0     0     0     0     0     0\r\n     0     0     0     0     0     0     0     1     0     1     0     0     0     0     0     0     0     0\r\n     0     0     0     0     0     0     0     0     1     0     1     0     0     0     0     0     0     0\r\n     0     0     0     0     0     0     0     0     0     1     0     1     0     0     0     0     0     0\r\n     0     0     0     0     0     0     0     0     0     0     1     0     1     0     0     0     0     0\r\n     0     0     0     0     0     0     0     0     0     0     0     1     0     1     0     0     0     0\r\n     0     0     0     0     0     0     0     0     0     0     0     0     1     0     1     0     0     0\r\n     0     0     0     0     0     0     0     0     0     0     0     0     0     1     0     1     0     0\r\n     0     0     0     0     0     0     0     0     0     0     0     0     0     0     1     0     1     0\r\n     0     0     0     0     0     0     0     0     0     0     0     0     0     0     0     1     0     1\r\n     0     0     0     0     0     0     0     0     0     0     0     0     0     0     0     0     1     1];\r\nassert(isequal(your_fcn_name(x),y_correct))\r\n","published":true,"deleted":false,"likes_count":2,"comments_count":0,"created_by":5217,"edited_by":null,"edited_at":null,"deleted_by":null,"deleted_at":null,"solvers_count":309,"test_suite_updated_at":null,"rescore_all_solutions":false,"group_id":18,"created_at":"2013-03-08T10:45:22.000Z","updated_at":"2026-03-20T00:36:17.000Z","published_at":"2013-03-08T10:46:40.000Z","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\u003eMake a square matrix with this shape. For n=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\u003c/w:pPr\u003e\u003cw:r\u003e\u003cw:t\u003eM =\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[     1     1     0     0\\n     1     0     1     0\\n     0     1     0     1\\n     0     0     1     1]]\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":42987,"title":"Roots of a quadratic equation.","description":"Calculate the roots of a quadratic equation, given coefficients a, b, and c, for the equation a*x^2 + b*x + c = 0.","description_html":"\u003cp\u003eCalculate the roots of a quadratic equation, given coefficients a, b, and c, for the equation a*x^2 + b*x + c = 0.\u003c/p\u003e","function_template":"function y = quadRoots(a,b,c)\r\n  y = a;\r\nend","test_suite":"%%\r\na=1;\r\nb=2;\r\nc=1;\r\ny_correct = [-1 -1];\r\nassert(norm(quadRoots(a,b,c)-y_correct) \u003c 10*eps)\r\n\r\n%%\r\na=1;\r\nb=-5;\r\nc=6;\r\ny_correct = [2 3];\r\nassert(norm(quadRoots(a,b,c)-y_correct) \u003c 10*eps)\r\n\r\n%%\r\na=1;\r\nb=5;\r\nc=6;\r\ny_correct = [-3 -2];\r\nassert(norm(quadRoots(a,b,c)-y_correct) \u003c 10*eps)\r\n\r\n%%\r\na=2;\r\nb=10;\r\nc=12;\r\ny_correct = [-3 -2];\r\nassert(norm(quadRoots(a,b,c)-y_correct) \u003c 10*eps)\r\n\r\n%%\r\na=1;\r\nb=19;\r\nc=90;\r\ny_correct = [-10 -9];\r\nassert(norm(quadRoots(a,b,c)-y_correct) \u003c 100*eps)\r\n","published":true,"deleted":false,"likes_count":5,"comments_count":6,"created_by":91311,"edited_by":null,"edited_at":null,"deleted_by":null,"deleted_at":null,"solvers_count":73,"test_suite_updated_at":"2016-10-02T01:45:25.000Z","rescore_all_solutions":false,"group_id":1,"created_at":"2016-09-16T10:45:13.000Z","updated_at":"2026-02-13T18:45:17.000Z","published_at":"2016-09-16T10:45:13.000Z","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\u003eCalculate the roots of a quadratic equation, given coefficients a, b, and c, for the equation a*x^2 + b*x + c = 0.\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":42923,"title":"Given the variable x as your input, multiply it by four, then divide it by two. Then put the result in y.","description":"If x = 5,\r\n\r\ny = 4*5/2 = 10","description_html":"\u003cp\u003eIf x = 5,\u003c/p\u003e\u003cp\u003ey = 4*5/2 = 10\u003c/p\u003e","function_template":"function y = your_fcn_name(x)\r\n  y = x;\r\nend","test_suite":"%%\r\nx = 5;\r\ny_correct = 10;\r\nassert(isequal(your_fcn_name(x),y_correct))\r\n","published":true,"deleted":false,"likes_count":0,"comments_count":0,"created_by":27348,"edited_by":null,"edited_at":null,"deleted_by":null,"deleted_at":null,"solvers_count":189,"test_suite_updated_at":null,"rescore_all_solutions":false,"group_id":1,"created_at":"2016-08-26T16:26:26.000Z","updated_at":"2026-02-10T18:23:48.000Z","published_at":"2016-08-26T16:26:26.000Z","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\u003eIf x = 5,\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 = 4*5/2 = 10\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":42931,"title":"Square root of a number","description":"Write a code that will output the square root of x.","description_html":"\u003cp\u003eWrite a code that will output the square root of x.\u003c/p\u003e","function_template":"function y = your_fcn_name(x)\r\n  y = x;\r\nend","test_suite":"%%\r\nx = 4;\r\ny_correct = 2;\r\nassert(isequal(your_fcn_name(x),y_correct))\r\n\r\n%%\r\nx = 81;\r\ny_correct = 9;\r\nassert(isequal(your_fcn_name(x),y_correct))\r\n","published":true,"deleted":false,"likes_count":1,"comments_count":1,"created_by":27348,"edited_by":null,"edited_at":null,"deleted_by":null,"deleted_at":null,"solvers_count":454,"test_suite_updated_at":null,"rescore_all_solutions":false,"group_id":1,"created_at":"2016-08-26T20:16:02.000Z","updated_at":"2026-03-15T14:33:26.000Z","published_at":"2016-08-26T20:16:02.000Z","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\u003eWrite a code that will output the square root of x.\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":42928,"title":"Area of a circle","description":"Given the radius x, y would be the area of a circle.\r\n\r\nPi = 3.1416","description_html":"\u003cp\u003eGiven the radius x, y would be the area of a circle.\u003c/p\u003e\u003cp\u003ePi = 3.1416\u003c/p\u003e","function_template":"function y = your_fcn_name(x)\r\n  y = ....;\r\nend","test_suite":"%%\r\nx = 3;\r\ny_correct = 28.2744;\r\nassert(isequal(your_fcn_name(x),y_correct))\r\n\r\n%%\r\nx = 2;\r\ny_correct = 12.5664;\r\nassert(isequal(your_fcn_name(x),y_correct))\r\n","published":true,"deleted":false,"likes_count":5,"comments_count":1,"created_by":27348,"edited_by":null,"edited_at":null,"deleted_by":null,"deleted_at":null,"solvers_count":588,"test_suite_updated_at":null,"rescore_all_solutions":false,"group_id":1,"created_at":"2016-08-26T19:59:08.000Z","updated_at":"2026-02-06T20:53:17.000Z","published_at":"2016-08-26T19:59:08.000Z","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\",\"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 the radius x, y would be the area of a circle.\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\u003ePi = 3.1416\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":42934,"title":"Log of a number","description":"Write a script that will give the log of x as output.","description_html":"\u003cp\u003eWrite a script that will give the log of x as output.\u003c/p\u003e","function_template":"function y = your_fcn_name(x)\r\n  y = x;\r\nend","test_suite":"%%\r\nx = 10;\r\ny_correct = 2.3026;\r\nassert(isequal(your_fcn_name(x),y_correct))\r\n","published":true,"deleted":false,"likes_count":1,"comments_count":0,"created_by":27348,"edited_by":null,"edited_at":null,"deleted_by":null,"deleted_at":null,"solvers_count":169,"test_suite_updated_at":null,"rescore_all_solutions":false,"group_id":1,"created_at":"2016-08-26T20:34:53.000Z","updated_at":"2026-02-18T14:12:49.000Z","published_at":"2016-08-26T20:34:53.000Z","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\u003eWrite a script that will give the log of x as output.\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":42932,"title":"If you have matrix A, create matrix B using matrix A as an \"element\"","description":" A =  [1     2     3     4;\r\n       5     6     7     8]\r\n B =  [1     2     3     4     1     2     3     4;\r\n       5     6     7     8     5     6     7     8;\r\n       1     2     3     4     1     2     3     4;\r\n       5     6     7     8     5     6     7     8]","description_html":"\u003cpre\u003e A =  [1     2     3     4;\r\n       5     6     7     8]\r\n B =  [1     2     3     4     1     2     3     4;\r\n       5     6     7     8     5     6     7     8;\r\n       1     2     3     4     1     2     3     4;\r\n       5     6     7     8     5     6     7     8]\u003c/pre\u003e","function_template":"function y = your_fcn_name(x)\r\n  y = x;\r\nend","test_suite":"%%\r\nx = [1 2 3 4;5 6 7 8];\r\nB_correct = [1 2 3 4 1 2 3 4;5 6 7 8 5 6 7 8;1 2 3 4 1 2 3 4;5 6 7 8 5 6 7 8];\r\nassert(isequal(your_fcn_name(x),B_correct))\r\n","published":true,"deleted":false,"likes_count":1,"comments_count":0,"created_by":27348,"edited_by":null,"edited_at":null,"deleted_by":null,"deleted_at":null,"solvers_count":129,"test_suite_updated_at":null,"rescore_all_solutions":false,"group_id":1,"created_at":"2016-08-26T20:23:48.000Z","updated_at":"2026-02-18T11:03:40.000Z","published_at":"2016-08-26T20:23:48.000Z","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=\\\"code\\\"/\u003e\u003c/w:pPr\u003e\u003cw:r\u003e\u003cw:t\u003e\u003c![CDATA[ A =  [1     2     3     4;\\n       5     6     7     8]\\n B =  [1     2     3     4     1     2     3     4;\\n       5     6     7     8     5     6     7     8;\\n       1     2     3     4     1     2     3     4;\\n       5     6     7     8     5     6     7     8]]]\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":42925,"title":"ASCII Code","description":"Using matlab, give the symbol that is associated with ASCii code 90.","description_html":"\u003cp\u003eUsing matlab, give the symbol that is associated with ASCii code 90.\u003c/p\u003e","function_template":"function y = your_fcn_name(x)\r\n  y = ....;\r\nend","test_suite":"%%\r\nx = 1;\r\ny_correct = 'Z';\r\nassert(isequal(your_fcn_name(x),y_correct))\r\n","published":true,"deleted":false,"likes_count":2,"comments_count":1,"created_by":27348,"edited_by":null,"edited_at":null,"deleted_by":null,"deleted_at":null,"solvers_count":113,"test_suite_updated_at":"2016-08-26T17:07:23.000Z","rescore_all_solutions":false,"group_id":1,"created_at":"2016-08-26T16:49:45.000Z","updated_at":"2026-02-18T14:39:35.000Z","published_at":"2016-08-26T16:49:45.000Z","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\u003eUsing matlab, give the symbol that is associated with ASCii code 90.\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":2120,"title":"Rounding off numbers to n decimals","description":"Inspired by a mistake in one of the problems I created, I created this problem where you have to round off a floating point number to n decimals. There are 2 inputs to the function: x: floating point number and n: number of decimals which need to match with the given solutions.","description_html":"\u003cp\u003eInspired by a mistake in one of the problems I created, I created this problem where you have to round off a floating point number to n decimals. There are 2 inputs to the function: x: floating point number and n: number of decimals which need to match with the given solutions.\u003c/p\u003e","function_template":"function y = myround(x,n)\r\n  y = x;\r\nend","test_suite":"%%\r\nx = 1;\r\nn=1;\r\ny_correct = 1;\r\nassert(isequal(myround(x,n),y_correct))\r\n%%\r\nx = pi;\r\nn=5;\r\ny_correct = 3.14159;\r\nassert(isequal(myround(x,n),y_correct))\r\n%%\r\nx = 0.5*sqrt(2);\r\nn=6;\r\ny_correct = 0.707107;\r\nassert(isequal(myround(x,n),y_correct))\r\n%%\r\nx = exp(1);\r\nn=9;\r\ny_correct = 2.718281828;\r\nassert(isequal(myround(x,n),y_correct))\r\n%%\r\nx = 0.00123456;\r\nn=6;\r\ny_correct = 0.001235;\r\nassert(isequal(myround(x,n),y_correct))\r\n","published":true,"deleted":false,"likes_count":23,"comments_count":3,"created_by":20079,"edited_by":null,"edited_at":null,"deleted_by":null,"deleted_at":null,"solvers_count":5531,"test_suite_updated_at":"2014-01-15T04:17:27.000Z","rescore_all_solutions":false,"group_id":38,"created_at":"2014-01-15T04:03:48.000Z","updated_at":"2026-04-02T02:10:16.000Z","published_at":"2014-01-15T04:14:20.000Z","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\u003eInspired by a mistake in one of the problems I created, I created this problem where you have to round off a floating point number to n decimals. There are 2 inputs to the function: x: floating point number and n: number of decimals which need to match with the given solutions.\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":1325,"title":"Special matrix","description":"Make a square matrix with this shape. For n=4\r\n\r\nM =\r\n\r\n     1     1     0     0\r\n     1     0     1     0\r\n     0     1     0     1\r\n     0     0     1     1","description_html":"\u003cp\u003eMake a square matrix with this shape. For n=4\u003c/p\u003e\u003cp\u003eM =\u003c/p\u003e\u003cpre\u003e     1     1     0     0\r\n     1     0     1     0\r\n     0     1     0     1\r\n     0     0     1     1\u003c/pre\u003e","function_template":"function y = your_fcn_name(x)\r\n  y = x;\r\nend","test_suite":"%%\r\nx = 3;\r\ny_correct =  [1     1     0\r\n              1     0     1\r\n              0     1     1];\r\nassert(isequal(your_fcn_name(x),y_correct))\r\n\r\n%%\r\nx = 4;\r\ny_correct =  [     1     1     0     0\r\n                   1     0     1     0\r\n                   0     1     0     1\r\n                   0     0     1     1];\r\nassert(isequal(your_fcn_name(x),y_correct))\r\n\r\n%%\r\nx = 5;\r\ny_correct =  [     1     1     0     0     0\r\n                   1     0     1     0     0\r\n                   0     1     0     1     0\r\n                   0     0     1     0     1\r\n                   0     0     0     1     1];\r\nassert(isequal(your_fcn_name(x),y_correct))\r\n\r\n%%\r\nx = 6;\r\ny_correct =  [     1     1     0     0     0     0\r\n                   1     0     1     0     0     0\r\n                   0     1     0     1     0     0\r\n                   0     0     1     0     1     0\r\n                   0     0     0     1     0     1\r\n                   0     0     0     0     1     1];\r\nassert(isequal(your_fcn_name(x),y_correct))\r\n\r\n%%\r\nx = 18;\r\ny_correct =  [     1     1     0     0     0     0     0     0     0     0     0     0     0     0     0     0     0     0\r\n     1     0     1     0     0     0     0     0     0     0     0     0     0     0     0     0     0     0\r\n     0     1     0     1     0     0     0     0     0     0     0     0     0     0     0     0     0     0\r\n     0     0     1     0     1     0     0     0     0     0     0     0     0     0     0     0     0     0\r\n     0     0     0     1     0     1     0     0     0     0     0     0     0     0     0     0     0     0\r\n     0     0     0     0     1     0     1     0     0     0     0     0     0     0     0     0     0     0\r\n     0     0     0     0     0     1     0     1     0     0     0     0     0     0     0     0     0     0\r\n     0     0     0     0     0     0     1     0     1     0     0     0     0     0     0     0     0     0\r\n     0     0     0     0     0     0     0     1     0     1     0     0     0     0     0     0     0     0\r\n     0     0     0     0     0     0     0     0     1     0     1     0     0     0     0     0     0     0\r\n     0     0     0     0     0     0     0     0     0     1     0     1     0     0     0     0     0     0\r\n     0     0     0     0     0     0     0     0     0     0     1     0     1     0     0     0     0     0\r\n     0     0     0     0     0     0     0     0     0     0     0     1     0     1     0     0     0     0\r\n     0     0     0     0     0     0     0     0     0     0     0     0     1     0     1     0     0     0\r\n     0     0     0     0     0     0     0     0     0     0     0     0     0     1     0     1     0     0\r\n     0     0     0     0     0     0     0     0     0     0     0     0     0     0     1     0     1     0\r\n     0     0     0     0     0     0     0     0     0     0     0     0     0     0     0     1     0     1\r\n     0     0     0     0     0     0     0     0     0     0     0     0     0     0     0     0     1     1];\r\nassert(isequal(your_fcn_name(x),y_correct))\r\n","published":true,"deleted":false,"likes_count":2,"comments_count":0,"created_by":5217,"edited_by":null,"edited_at":null,"deleted_by":null,"deleted_at":null,"solvers_count":309,"test_suite_updated_at":null,"rescore_all_solutions":false,"group_id":18,"created_at":"2013-03-08T10:45:22.000Z","updated_at":"2026-03-20T00:36:17.000Z","published_at":"2013-03-08T10:46:40.000Z","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\u003eMake a square matrix with this shape. 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