{"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":44269,"title":"convert between ascii and characters","description":"I have seen multiple problems like this but none of them have a robust test suite associated with them.\r\n\r\nThe first input C is a char and CA is the ascii code for that char;\r\nThe second input A is a number and AC is the char from that ascii code.","description_html":"\u003cp\u003eI have seen multiple problems like this but none of them have a robust test suite associated with them.\u003c/p\u003e\u003cp\u003eThe first input C is a char and CA is the ascii code for that char;\r\nThe second input A is a number and AC is the char from that ascii code.\u003c/p\u003e","function_template":"function [CA AC] = Ascii_Conversions(C,A)\r\n  CA = C;\r\n  AC = A;\r\nend","test_suite":"%%\r\nC = 'b';\r\nA = 122;\r\nCA_C = 98;\r\nAC_C = 'z';\r\n[CA AC] = Ascii_Conversions(C,A);\r\nassert(isequal(CA,CA_C))\r\nassert(strcmp(AC,AC_C))\r\n\r\n%%\r\nC = 'H';\r\nA = 115;\r\nCA_C = 72;\r\nAC_C = 's';\r\n[CA AC] = Ascii_Conversions(C,A);\r\nassert(isequal(CA,CA_C))\r\nassert(strcmp(AC,AC_C))\r\n\r\n\r\n%%\r\nC = '/';\r\nA = 50;\r\nCA_C = 47;\r\nAC_C = '2';\r\n[CA AC] = Ascii_Conversions(C,A);\r\nassert(isequal(CA,CA_C))\r\nassert(strcmp(AC,AC_C))\r\n\r\n%%\r\nC = '}';\r\nA = 64;\r\nCA_C = 125;\r\nAC_C = '@';\r\n[CA AC] = Ascii_Conversions(C,A);\r\nassert(isequal(CA,CA_C))\r\nassert(strcmp(AC,AC_C))","published":true,"deleted":false,"likes_count":0,"comments_count":0,"created_by":136968,"edited_by":null,"edited_at":null,"deleted_by":null,"deleted_at":null,"solvers_count":64,"test_suite_updated_at":null,"rescore_all_solutions":false,"group_id":1,"created_at":"2017-07-25T18:01:55.000Z","updated_at":"2026-04-02T19:16:30.000Z","published_at":"2017-07-25T18:01:55.000Z","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\",\"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\u003eI have seen multiple problems like this but none of them have a robust test suite associated with them.\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\u003eThe first input C is a char and CA is the ascii code for that char; The second input A is a number and AC is the char from that ascii code.\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":52133,"title":"MATLAB Basics: Complex Conjugates","description":"For a given complex number, x, return the complex conjugate, y.","description_html":"\u003cdiv style = \"text-align: start; line-height: 20.4333px; 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: rgb(0, 0, 0); white-space: normal; \"\u003e\u003cdiv style=\"block-size: 21px; display: block; min-width: 0px; padding-block-start: 0px; padding-top: 0px; perspective-origin: 407px 10.5px; transform-origin: 407px 10.5px; vertical-align: baseline; \"\u003e\u003cdiv style=\"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 10.5px; text-align: left; transform-origin: 384px 10.5px; 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: 200.5px 8px; transform-origin: 200.5px 8px; unicode-bidi: normal; \"\u003e\u003cspan style=\"\"\u003eFor a given complex number, x, return the complex conjugate, y.\u003c/span\u003e\u003c/span\u003e\u003c/div\u003e\u003c/div\u003e\u003c/div\u003e","function_template":"function y = compconj(x)\r\n  y = ;\r\nend","test_suite":"%%\r\nx = 1+i;\r\ny_correct = 1-i;\r\nassert(isequal(compconj(x),y_correct))\r\n%%\r\nx = 1-i;\r\ny_correct = 1+i;\r\nassert(isequal(compconj(x),y_correct))\r\n%%\r\nx = 3i;\r\ny_correct = -3i;\r\nassert(isequal(compconj(x),y_correct))\r\n%%\r\nx = 7;\r\ny_correct = 7;\r\nassert(isequal(compconj(x),y_correct))\r\n%%\r\nx = 7-13i;\r\ny_correct = 7+13i;\r\nassert(isequal(compconj(x),y_correct))","published":true,"deleted":false,"likes_count":0,"comments_count":1,"created_by":1231855,"edited_by":null,"edited_at":null,"deleted_by":null,"deleted_at":null,"solvers_count":60,"test_suite_updated_at":"2021-06-28T19:38:20.000Z","rescore_all_solutions":false,"group_id":1,"created_at":"2021-06-28T14:07:04.000Z","updated_at":"2026-02-11T18:32:04.000Z","published_at":"2021-06-28T14:07:36.000Z","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\u003eFor a given complex number, x, return the complex conjugate, y.\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\"}]}"},{"id":44613,"title":"Find NaNs in the matrix","description":"Return 1s wherever there is a NaN in the input matrix","description_html":"\u003cp\u003eReturn 1s wherever there is a NaN in the input matrix\u003c/p\u003e","function_template":"function y = return_nans(x)\r\n  \r\nend","test_suite":"%%\r\nx = 0./[6 4 0 3 -9];\r\ny_correct = [0   0   1   0   0];\r\nassert(isequal(return_nans(x),y_correct))\r\n\r\n%%\r\nx = [1 1 NaN NaN];\r\ny_correct = [0 0 1 1];\r\nassert(isequal(return_nans(x),y_correct))\r\n\r\n%%\r\nx =[1 1 NaN NaN; 5,2,3,NaN];\r\ny_correct = [0 0 1 1; 0 0 0 1];\r\nassert(isequal(return_nans(x),y_correct))\r\n","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":87,"test_suite_updated_at":null,"rescore_all_solutions":false,"group_id":1,"created_at":"2018-04-17T05:48:44.000Z","updated_at":"2026-03-09T20:40:54.000Z","published_at":"2018-04-17T05:48:44.000Z","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\u003eReturn 1s wherever there is a NaN in the input matrix\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":44663,"title":"Datetime basics","description":"Generate the datetime scalar representing the current date","description_html":"\u003cp\u003eGenerate the datetime scalar representing the current date\u003c/p\u003e","function_template":"function y = generate_datetime()\r\n  \r\nend","test_suite":"%%\r\ny_correct = datetime('today');\r\nassert(isequal(generate_datetime(),y_correct))\r\n","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":135,"test_suite_updated_at":null,"rescore_all_solutions":false,"group_id":1,"created_at":"2018-05-29T14:59:26.000Z","updated_at":"2026-03-02T09:12:44.000Z","published_at":"2018-05-29T14:59:26.000Z","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\u003eGenerate the datetime scalar representing the current date\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":44696,"title":"Sum of unique multiples of 3 and 5","description":"If we list all the natural numbers up to 15 that are multiples of 3 or 5, we get 3, 5, 6, 9, 10, 12 and 15. The sum of these multiples is 60. \r\n\r\nWrite a function called _*sum3and5muls*_ that returns the sum of all the unique multiples of 3 or 5 up to n where n is a positive integer and the only input argument of the function.","description_html":"\u003cp\u003eIf we list all the natural numbers up to 15 that are multiples of 3 or 5, we get 3, 5, 6, 9, 10, 12 and 15. The sum of these multiples is 60.\u003c/p\u003e\u003cp\u003eWrite a function called \u003ci\u003e\u003cb\u003esum3and5muls\u003c/b\u003e\u003c/i\u003e that returns the sum of all the unique multiples of 3 or 5 up to n where n is a positive integer and the only input argument of the function.\u003c/p\u003e","function_template":"function sum_mult = sum3and5muls(n)\r\n    sum_mult\r\nend","test_suite":"%%\r\nn = 15;\r\nsm_correct = 60;\r\nassert(isequal(sum3and5muls(n),sm_correct))\r\n\r\n%%\r\nn = 18;\r\nsm_correct = 78;\r\nassert(isequal(sum3and5muls(n),sm_correct))\r\n\r\n%%\r\nn = (2^2)-1;\r\nsm_correct = 3;\r\nassert(isequal(sum3and5muls(n),sm_correct))\r\n\r\n%%\r\nn = randi(25);\r\nsm_correct = sum(3:3:n)+sum(5:5:n)-sum(15:15:n);\r\nassert(isequal(sum3and5muls(n),sm_correct))\r\n","published":true,"deleted":false,"likes_count":1,"comments_count":0,"created_by":171559,"edited_by":null,"edited_at":null,"deleted_by":null,"deleted_at":null,"solvers_count":61,"test_suite_updated_at":"2018-07-10T11:40:12.000Z","rescore_all_solutions":false,"group_id":1,"created_at":"2018-07-10T11:35:26.000Z","updated_at":"2026-03-02T14:30:43.000Z","published_at":"2018-07-10T11:40:12.000Z","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\",\"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 we list all the natural numbers up to 15 that are multiples of 3 or 5, we get 3, 5, 6, 9, 10, 12 and 15. The sum of these multiples is 60.\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\u003eWrite a function called\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\u003e\u003c/w:t\u003e\u003c/w:r\u003e\u003cw:r\u003e\u003cw:rPr\u003e\u003cw:b/\u003e\u003cw:i/\u003e\u003c/w:rPr\u003e\u003cw:t\u003esum3and5muls\u003c/w:t\u003e\u003c/w:r\u003e\u003cw:r\u003e\u003cw:t\u003e that returns the sum of all the unique multiples of 3 or 5 up to n where n is a positive integer and the only input argument of the function.\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":44618,"title":"surface areas of a cylinder","description":"There are 3 inputs: option, radius and height. If option= '1', compute the lateral surface area of the cylinder, for option 2 calculate the total surface area of the cylinder. For any other option, compute the total area of both flat sides of the cylinder.","description_html":"\u003cp\u003eThere are 3 inputs: option, radius and height. If option= '1', compute the lateral surface area of the cylinder, for option 2 calculate the total surface area of the cylinder. For any other option, compute the total area of both flat sides of the cylinder.\u003c/p\u003e","function_template":"function y = surface_area_cyl(optn,r,h)\r\n  y = r*h;\r\nend","test_suite":"%%\r\noptn=1;\r\nr=3;\r\nh=6;\r\ny_correct = 36*pi;\r\nassert(isequal(surface_area_cyl(optn,r,h),y_correct))\r\n\r\n%%\r\noptn=5;\r\nr=3;\r\nh=6;\r\ny_correct = 18*pi;\r\nassert(isequal(surface_area_cyl(optn,r,h),y_correct))\r\n\r\n%%\r\noptn=2;\r\nr=2;\r\nh=2;\r\ny_correct = 16*pi;\r\nassert(isequal(surface_area_cyl(optn,r,h),y_correct))\r\n\r\n%%\r\noptn=0;\r\nr=5;\r\nh=10;\r\ny_correct = 50*pi;\r\nassert(isequal(surface_area_cyl(optn,r,h),y_correct))\r\n\r\n%%\r\noptn=1;\r\nr=5;\r\nh=10;\r\ny_correct = 100*pi;\r\nassert(isequal(surface_area_cyl(optn,r,h),y_correct))\r\n\r\n%%\r\noptn=2;\r\nr=5;\r\nh=10;\r\ny_correct = 150*pi;\r\nassert(isequal(surface_area_cyl(optn,r,h),y_correct))\r\n\r\n%%\r\noptn=42;\r\nr=3;\r\nh=7;\r\ny_correct = 18*pi;\r\nassert(isequal(surface_area_cyl(optn,r,h),y_correct))\r\n\r\n%%\r\noptn=2;\r\nr=3\r\nh=7;\r\ny_correct = 60*pi;\r\nassert(isequal(surface_area_cyl(optn,r,h),y_correct))\r\n\r\n%%\r\noptn=1;\r\nr=3;\r\nh=7;\r\ny_correct = 42*pi;\r\nassert(isequal(surface_area_cyl(optn,r,h),y_correct))\r\n","published":true,"deleted":false,"likes_count":2,"comments_count":1,"created_by":171559,"edited_by":null,"edited_at":null,"deleted_by":null,"deleted_at":null,"solvers_count":53,"test_suite_updated_at":"2018-07-16T16:54:54.000Z","rescore_all_solutions":false,"group_id":1,"created_at":"2018-04-20T05:49:29.000Z","updated_at":"2026-04-03T06:59:13.000Z","published_at":"2018-04-20T05:49:29.000Z","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\u003eThere are 3 inputs: option, radius and height. If option= '1', compute the lateral surface area of the cylinder, for option 2 calculate the total surface area of the cylinder. For any other option, compute the total area of both flat sides of the cylinder.\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":44661,"title":"Remove white spaces at the end of the input string","description":"Remove all trailing white spaces at the end of the input strings","description_html":"\u003cp\u003eRemove all trailing white spaces at the end of the input strings\u003c/p\u003e","function_template":"function y = rem_trail_ws(A)\r\n  A\r\nend","test_suite":"%%\r\nA = 'This is a test string.             ';\r\ny_correct = 'This is a test string.';\r\nassert(isequal(rem_trail_ws(A),y_correct))\r\n\r\n%%\r\nA = '          Testing function rem_trail_ws';\r\ny_correct = '          Testing function rem_trail_ws';\r\nassert(isequal(rem_trail_ws(A),y_correct))\r\n\r\n%%\r\nA = {'MATLAB    ','SIMULINK    ';\r\n     'Toolboxes    ','MathWorks    '};\r\ny_correct = {'MATLAB','SIMULINK';\r\n     'Toolboxes','MathWorks'};\r\nassert(isequal(rem_trail_ws(A),y_correct))\r\n\r\n%%\r\nA = sprintf('MATHWORKS \\t');\r\ny_correct = 'MATHWORKS';\r\nassert(isequal(rem_trail_ws(A),y_correct))","published":true,"deleted":false,"likes_count":1,"comments_count":0,"created_by":171559,"edited_by":null,"edited_at":null,"deleted_by":null,"deleted_at":null,"solvers_count":54,"test_suite_updated_at":null,"rescore_all_solutions":false,"group_id":1,"created_at":"2018-05-29T14:21:22.000Z","updated_at":"2025-12-07T18:25:49.000Z","published_at":"2018-05-29T14:21:22.000Z","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\u003eRemove all trailing white spaces at the end of the input strings\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":44269,"title":"convert between ascii and characters","description":"I have seen multiple problems like this but none of them have a robust test suite associated with them.\r\n\r\nThe first input C is a char and CA is the ascii code for that char;\r\nThe second input A is a number and AC is the char from that ascii code.","description_html":"\u003cp\u003eI have seen multiple problems like this but none of them have a robust test suite associated with them.\u003c/p\u003e\u003cp\u003eThe first input C is a char and CA is the ascii code for that char;\r\nThe second input A is a number and AC is the char from that ascii code.\u003c/p\u003e","function_template":"function [CA AC] = Ascii_Conversions(C,A)\r\n  CA = C;\r\n  AC = A;\r\nend","test_suite":"%%\r\nC = 'b';\r\nA = 122;\r\nCA_C = 98;\r\nAC_C = 'z';\r\n[CA AC] = Ascii_Conversions(C,A);\r\nassert(isequal(CA,CA_C))\r\nassert(strcmp(AC,AC_C))\r\n\r\n%%\r\nC = 'H';\r\nA = 115;\r\nCA_C = 72;\r\nAC_C = 's';\r\n[CA AC] = Ascii_Conversions(C,A);\r\nassert(isequal(CA,CA_C))\r\nassert(strcmp(AC,AC_C))\r\n\r\n\r\n%%\r\nC = '/';\r\nA = 50;\r\nCA_C = 47;\r\nAC_C = '2';\r\n[CA AC] = Ascii_Conversions(C,A);\r\nassert(isequal(CA,CA_C))\r\nassert(strcmp(AC,AC_C))\r\n\r\n%%\r\nC = '}';\r\nA = 64;\r\nCA_C = 125;\r\nAC_C = '@';\r\n[CA AC] = Ascii_Conversions(C,A);\r\nassert(isequal(CA,CA_C))\r\nassert(strcmp(AC,AC_C))","published":true,"deleted":false,"likes_count":0,"comments_count":0,"created_by":136968,"edited_by":null,"edited_at":null,"deleted_by":null,"deleted_at":null,"solvers_count":64,"test_suite_updated_at":null,"rescore_all_solutions":false,"group_id":1,"created_at":"2017-07-25T18:01:55.000Z","updated_at":"2026-04-02T19:16:30.000Z","published_at":"2017-07-25T18:01:55.000Z","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\",\"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\u003eI have seen multiple problems like this but none of them have a robust test suite associated with them.\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\u003eThe first input C is a char and CA is the ascii code for that char; The second input A is a number and AC is the char from that ascii code.\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":52133,"title":"MATLAB Basics: Complex Conjugates","description":"For a given complex number, x, return the complex conjugate, y.","description_html":"\u003cdiv style = \"text-align: start; line-height: 20.4333px; 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: rgb(0, 0, 0); white-space: normal; \"\u003e\u003cdiv style=\"block-size: 21px; display: block; min-width: 0px; padding-block-start: 0px; padding-top: 0px; perspective-origin: 407px 10.5px; transform-origin: 407px 10.5px; vertical-align: baseline; \"\u003e\u003cdiv style=\"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 10.5px; text-align: left; transform-origin: 384px 10.5px; 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: 200.5px 8px; transform-origin: 200.5px 8px; unicode-bidi: normal; \"\u003e\u003cspan style=\"\"\u003eFor a given complex number, x, return the complex conjugate, y.\u003c/span\u003e\u003c/span\u003e\u003c/div\u003e\u003c/div\u003e\u003c/div\u003e","function_template":"function y = compconj(x)\r\n  y = ;\r\nend","test_suite":"%%\r\nx = 1+i;\r\ny_correct = 1-i;\r\nassert(isequal(compconj(x),y_correct))\r\n%%\r\nx = 1-i;\r\ny_correct = 1+i;\r\nassert(isequal(compconj(x),y_correct))\r\n%%\r\nx = 3i;\r\ny_correct = -3i;\r\nassert(isequal(compconj(x),y_correct))\r\n%%\r\nx = 7;\r\ny_correct = 7;\r\nassert(isequal(compconj(x),y_correct))\r\n%%\r\nx = 7-13i;\r\ny_correct = 7+13i;\r\nassert(isequal(compconj(x),y_correct))","published":true,"deleted":false,"likes_count":0,"comments_count":1,"created_by":1231855,"edited_by":null,"edited_at":null,"deleted_by":null,"deleted_at":null,"solvers_count":60,"test_suite_updated_at":"2021-06-28T19:38:20.000Z","rescore_all_solutions":false,"group_id":1,"created_at":"2021-06-28T14:07:04.000Z","updated_at":"2026-02-11T18:32:04.000Z","published_at":"2021-06-28T14:07:36.000Z","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\u003eFor a given complex number, x, return the complex conjugate, y.\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\"}]}"},{"id":44613,"title":"Find NaNs in the matrix","description":"Return 1s wherever there is a NaN in the input matrix","description_html":"\u003cp\u003eReturn 1s wherever there is a NaN in the input matrix\u003c/p\u003e","function_template":"function y = return_nans(x)\r\n  \r\nend","test_suite":"%%\r\nx = 0./[6 4 0 3 -9];\r\ny_correct = [0   0   1   0   0];\r\nassert(isequal(return_nans(x),y_correct))\r\n\r\n%%\r\nx = [1 1 NaN NaN];\r\ny_correct = [0 0 1 1];\r\nassert(isequal(return_nans(x),y_correct))\r\n\r\n%%\r\nx =[1 1 NaN NaN; 5,2,3,NaN];\r\ny_correct = [0 0 1 1; 0 0 0 1];\r\nassert(isequal(return_nans(x),y_correct))\r\n","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":87,"test_suite_updated_at":null,"rescore_all_solutions":false,"group_id":1,"created_at":"2018-04-17T05:48:44.000Z","updated_at":"2026-03-09T20:40:54.000Z","published_at":"2018-04-17T05:48:44.000Z","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\u003eReturn 1s wherever there is a NaN in the input matrix\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":44663,"title":"Datetime basics","description":"Generate the datetime scalar representing the current date","description_html":"\u003cp\u003eGenerate the datetime scalar representing the current date\u003c/p\u003e","function_template":"function y = generate_datetime()\r\n  \r\nend","test_suite":"%%\r\ny_correct = datetime('today');\r\nassert(isequal(generate_datetime(),y_correct))\r\n","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":135,"test_suite_updated_at":null,"rescore_all_solutions":false,"group_id":1,"created_at":"2018-05-29T14:59:26.000Z","updated_at":"2026-03-02T09:12:44.000Z","published_at":"2018-05-29T14:59:26.000Z","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\u003eGenerate the datetime scalar representing the current date\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":44696,"title":"Sum of unique multiples of 3 and 5","description":"If we list all the natural numbers up to 15 that are multiples of 3 or 5, we get 3, 5, 6, 9, 10, 12 and 15. The sum of these multiples is 60. \r\n\r\nWrite a function called _*sum3and5muls*_ that returns the sum of all the unique multiples of 3 or 5 up to n where n is a positive integer and the only input argument of the function.","description_html":"\u003cp\u003eIf we list all the natural numbers up to 15 that are multiples of 3 or 5, we get 3, 5, 6, 9, 10, 12 and 15. The sum of these multiples is 60.\u003c/p\u003e\u003cp\u003eWrite a function called \u003ci\u003e\u003cb\u003esum3and5muls\u003c/b\u003e\u003c/i\u003e that returns the sum of all the unique multiples of 3 or 5 up to n where n is a positive integer and the only input argument of the function.\u003c/p\u003e","function_template":"function sum_mult = sum3and5muls(n)\r\n    sum_mult\r\nend","test_suite":"%%\r\nn = 15;\r\nsm_correct = 60;\r\nassert(isequal(sum3and5muls(n),sm_correct))\r\n\r\n%%\r\nn = 18;\r\nsm_correct = 78;\r\nassert(isequal(sum3and5muls(n),sm_correct))\r\n\r\n%%\r\nn = (2^2)-1;\r\nsm_correct = 3;\r\nassert(isequal(sum3and5muls(n),sm_correct))\r\n\r\n%%\r\nn = randi(25);\r\nsm_correct = sum(3:3:n)+sum(5:5:n)-sum(15:15:n);\r\nassert(isequal(sum3and5muls(n),sm_correct))\r\n","published":true,"deleted":false,"likes_count":1,"comments_count":0,"created_by":171559,"edited_by":null,"edited_at":null,"deleted_by":null,"deleted_at":null,"solvers_count":61,"test_suite_updated_at":"2018-07-10T11:40:12.000Z","rescore_all_solutions":false,"group_id":1,"created_at":"2018-07-10T11:35:26.000Z","updated_at":"2026-03-02T14:30:43.000Z","published_at":"2018-07-10T11:40:12.000Z","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\",\"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 we list all the natural numbers up to 15 that are multiples of 3 or 5, we get 3, 5, 6, 9, 10, 12 and 15. The sum of these multiples is 60.\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\u003eWrite a function called\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\u003e\u003c/w:t\u003e\u003c/w:r\u003e\u003cw:r\u003e\u003cw:rPr\u003e\u003cw:b/\u003e\u003cw:i/\u003e\u003c/w:rPr\u003e\u003cw:t\u003esum3and5muls\u003c/w:t\u003e\u003c/w:r\u003e\u003cw:r\u003e\u003cw:t\u003e that returns the sum of all the unique multiples of 3 or 5 up to n where n is a positive integer and the only input argument of the function.\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":44618,"title":"surface areas of a cylinder","description":"There are 3 inputs: option, radius and height. If option= '1', compute the lateral surface area of the cylinder, for option 2 calculate the total surface area of the cylinder. For any other option, compute the total area of both flat sides of the cylinder.","description_html":"\u003cp\u003eThere are 3 inputs: option, radius and height. If option= '1', compute the lateral surface area of the cylinder, for option 2 calculate the total surface area of the cylinder. For any other option, compute the total area of both flat sides of the cylinder.\u003c/p\u003e","function_template":"function y = surface_area_cyl(optn,r,h)\r\n  y = r*h;\r\nend","test_suite":"%%\r\noptn=1;\r\nr=3;\r\nh=6;\r\ny_correct = 36*pi;\r\nassert(isequal(surface_area_cyl(optn,r,h),y_correct))\r\n\r\n%%\r\noptn=5;\r\nr=3;\r\nh=6;\r\ny_correct = 18*pi;\r\nassert(isequal(surface_area_cyl(optn,r,h),y_correct))\r\n\r\n%%\r\noptn=2;\r\nr=2;\r\nh=2;\r\ny_correct = 16*pi;\r\nassert(isequal(surface_area_cyl(optn,r,h),y_correct))\r\n\r\n%%\r\noptn=0;\r\nr=5;\r\nh=10;\r\ny_correct = 50*pi;\r\nassert(isequal(surface_area_cyl(optn,r,h),y_correct))\r\n\r\n%%\r\noptn=1;\r\nr=5;\r\nh=10;\r\ny_correct = 100*pi;\r\nassert(isequal(surface_area_cyl(optn,r,h),y_correct))\r\n\r\n%%\r\noptn=2;\r\nr=5;\r\nh=10;\r\ny_correct = 150*pi;\r\nassert(isequal(surface_area_cyl(optn,r,h),y_correct))\r\n\r\n%%\r\noptn=42;\r\nr=3;\r\nh=7;\r\ny_correct = 18*pi;\r\nassert(isequal(surface_area_cyl(optn,r,h),y_correct))\r\n\r\n%%\r\noptn=2;\r\nr=3\r\nh=7;\r\ny_correct = 60*pi;\r\nassert(isequal(surface_area_cyl(optn,r,h),y_correct))\r\n\r\n%%\r\noptn=1;\r\nr=3;\r\nh=7;\r\ny_correct = 42*pi;\r\nassert(isequal(surface_area_cyl(optn,r,h),y_correct))\r\n","published":true,"deleted":false,"likes_count":2,"comments_count":1,"created_by":171559,"edited_by":null,"edited_at":null,"deleted_by":null,"deleted_at":null,"solvers_count":53,"test_suite_updated_at":"2018-07-16T16:54:54.000Z","rescore_all_solutions":false,"group_id":1,"created_at":"2018-04-20T05:49:29.000Z","updated_at":"2026-04-03T06:59:13.000Z","published_at":"2018-04-20T05:49:29.000Z","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\u003eThere are 3 inputs: option, radius and height. If option= '1', compute the lateral surface area of the cylinder, for option 2 calculate the total surface area of the cylinder. For any other option, compute the total area of both flat sides of the cylinder.\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":44661,"title":"Remove white spaces at the end of the input string","description":"Remove all trailing white spaces at the end of the input strings","description_html":"\u003cp\u003eRemove all trailing white spaces at the end of the input strings\u003c/p\u003e","function_template":"function y = rem_trail_ws(A)\r\n  A\r\nend","test_suite":"%%\r\nA = 'This is a test string.             ';\r\ny_correct = 'This is a test string.';\r\nassert(isequal(rem_trail_ws(A),y_correct))\r\n\r\n%%\r\nA = '          Testing function rem_trail_ws';\r\ny_correct = '          Testing function rem_trail_ws';\r\nassert(isequal(rem_trail_ws(A),y_correct))\r\n\r\n%%\r\nA = {'MATLAB    ','SIMULINK    ';\r\n     'Toolboxes    ','MathWorks    '};\r\ny_correct = {'MATLAB','SIMULINK';\r\n     'Toolboxes','MathWorks'};\r\nassert(isequal(rem_trail_ws(A),y_correct))\r\n\r\n%%\r\nA = sprintf('MATHWORKS \\t');\r\ny_correct = 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