{"group":{"id":1,"name":"Community","lockable":false,"created_at":"2012-01-18T18:02:15.000Z","updated_at":"2026-04-06T14:01:22.000Z","description":"Problems submitted by members of the MATLAB Central community.","is_default":true,"created_by":161519,"badge_id":null,"featured":false,"trending":false,"solution_count_in_trending_period":0,"trending_last_calculated":"2026-04-06T00:00:00.000Z","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":43603,"title":"Convert array of decimal numbers into  hexadecimal numbers array.","description":"Convert array of decimal numbers into  hexadecimal numbers array.\r\n\r\nExample \r\n\r\nx =[ 32    33    34    35    36    37    38    39    40    41    42    43   44 45]\r\n\r\nres= ['20' ;'21' ;'22'; '23' ;'24' ;'25' ;'26' ;'27' ;'28'; '29' ;'2A'; '2B' ;'2C'; '2D'];","description_html":"\u003cp\u003eConvert array of decimal numbers into  hexadecimal numbers array.\u003c/p\u003e\u003cp\u003eExample\u003c/p\u003e\u003cp\u003ex =[ 32    33    34    35    36    37    38    39    40    41    42    43   44 45]\u003c/p\u003e\u003cp\u003eres= ['20' ;'21' ;'22'; '23' ;'24' ;'25' ;'26' ;'27' ;'28'; '29' ;'2A'; '2B' ;'2C'; '2D'];\u003c/p\u003e","function_template":"function y = Converter(x)\r\n  y = x;\r\nend","test_suite":"%%\r\nx = 1;\r\ny_correct = '1';\r\nassert(isequal(Converter(x),y_correct))\r\n%%\r\nx = 1:5;\r\ny_correct = ['1' '2' '3' '4' '5'];\r\nassert(isequal(Converter(x),y_correct'))\r\n%%\r\nx = 32:45;\r\ny_correct = ['20' ;'21' ;'22'; '23' ;'24' ;'25' ;'26' ;'27' ;'28'; '29' ;'2A'; '2B' ;'2C'; '2D'];\r\nassert(isequal(Converter(x),y_correct))","published":true,"deleted":false,"likes_count":2,"comments_count":2,"created_by":90467,"edited_by":null,"edited_at":null,"deleted_by":null,"deleted_at":null,"solvers_count":68,"test_suite_updated_at":null,"rescore_all_solutions":false,"group_id":1,"created_at":"2016-10-23T13:16:26.000Z","updated_at":"2026-02-12T12:13:15.000Z","published_at":"2016-10-23T13:16:26.000Z","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\u003eConvert array of decimal numbers into hexadecimal numbers array.\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\u003eExample\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\u003ex =[ 32 33 34 35 36 37 38 39 40 41 42 43 44 45]\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\u003eres= ['20' ;'21' ;'22'; '23' ;'24' ;'25' ;'26' ;'27' ;'28'; '29' ;'2A'; '2B' ;'2C'; '2D'];\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":540,"title":"Convert hex color specification to MATLAB RGB","description":"Here's something that comes up all the time if you deal with web pages.\r\n\r\nGiven a \u003chttp://www.w3schools.com/html/html_colors.asp hexadecimal color specification\u003e of the form #FFFFFF, convert it to a 3 element MATLAB color specification. Remember that MATLAB RGB color values are between 0 and 1.\r\n\r\nThe input is a string starting with '#'. The output should be a 1-by-3 vector.\r\n\r\nExamples:\r\n\r\n Input  '#0000FF'\r\n Output [0 0 1]\r\n \r\n Input  '#33FF00'\r\n Output [0.2 1 0]","description_html":"\u003cp\u003eHere's something that comes up all the time if you deal with web pages.\u003c/p\u003e\u003cp\u003eGiven a \u003ca href=\"http://www.w3schools.com/html/html_colors.asp\"\u003ehexadecimal color specification\u003c/a\u003e of the form #FFFFFF, convert it to a 3 element MATLAB color specification. Remember that MATLAB RGB color values are between 0 and 1.\u003c/p\u003e\u003cp\u003eThe input is a string starting with '#'. The output should be a 1-by-3 vector.\u003c/p\u003e\u003cp\u003eExamples:\u003c/p\u003e\u003cpre\u003e Input  '#0000FF'\r\n Output [0 0 1]\u003c/pre\u003e\u003cpre\u003e Input  '#33FF00'\r\n Output [0.2 1 0]\u003c/pre\u003e","function_template":"function rgb = color_hex2rgb(hex)\r\n  rgb = [0 0 0];\r\nend","test_suite":"%%\r\nhex =  '#0000FF';\r\nrgb = [0 0 1];\r\nassert(isequal(color_hex2rgb(hex),rgb))\r\n\r\n%%\r\nhex =  '#33FF00';\r\nrgb = [0.2 1 0];\r\nassert(isequal(color_hex2rgb(hex),rgb))\r\n\r\n%%\r\nhex =  '#FFCCFF';\r\nrgb = [1 0.8 1];\r\nassert(isequal(color_hex2rgb(hex),rgb))\r\n\r\n%%\r\nhex =  '#999999';\r\nrgb = [.6 .6 .6];\r\nassert(isequal(color_hex2rgb(hex),rgb))","published":true,"deleted":false,"likes_count":7,"comments_count":0,"created_by":7,"edited_by":null,"edited_at":null,"deleted_by":null,"deleted_at":null,"solvers_count":259,"test_suite_updated_at":null,"rescore_all_solutions":false,"group_id":1,"created_at":"2012-03-30T18:18:52.000Z","updated_at":"2026-04-11T10:21:21.000Z","published_at":"2012-03-30T18:26:28.000Z","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\u003eHere's something that comes up all the time if you deal with web pages.\u003c/w:t\u003e\u003c/w:r\u003e\u003c/w:p\u003e\u003cw:p\u003e\u003cw:pPr\u003e\u003cw:pStyle w:val=\\\"text\\\"/\u003e\u003c/w:pPr\u003e\u003cw:r\u003e\u003cw:t\u003eGiven a\u003c/w:t\u003e\u003c/w:r\u003e\u003cw:r\u003e\u003cw:t\u003e \u003c/w:t\u003e\u003c/w:r\u003e\u003cw:hyperlink w:docLocation=\\\"http://www.w3schools.com/html/html_colors.asp\\\"\u003e\u003cw:r\u003e\u003cw:t\u003ehexadecimal color specification\u003c/w:t\u003e\u003c/w:r\u003e\u003c/w:hyperlink\u003e\u003cw:r\u003e\u003cw:t\u003e of the form #FFFFFF, convert it to a 3 element MATLAB color specification. Remember that MATLAB RGB color values are between 0 and 1.\u003c/w:t\u003e\u003c/w:r\u003e\u003c/w:p\u003e\u003cw:p\u003e\u003cw:pPr\u003e\u003cw:pStyle w:val=\\\"text\\\"/\u003e\u003c/w:pPr\u003e\u003cw:r\u003e\u003cw:t\u003eThe input is a string starting with '#'. The output should be a 1-by-3 vector.\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\u003eExamples:\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[ Input  '#0000FF'\\n Output [0 0 1]\\n\\n Input  '#33FF00'\\n Output [0.2 1 0]]]\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":1948,"title":"Convert this color - RGB Vector to Hex String","description":"Given a 3 element RGB vector corresponding to a color (given by the MATLAB color spec \u003chttp://www.mathworks.com/help/matlab/ref/colorspec.html\u003e), return the corresponding hex value string associated with it. This hex value string is often used when coding in HTML to specify a color. \r\n\r\nFor example, given the vector [0, 1, 1], you would return the string 00FFFF and given the vector [.5 .5 .2], you would return the string 7F7F33. We will assume that in this case once we multiply the vector by 255, we will round down to the nearest integer. If anyone thinks that we should not assume rounding down, feel free to comment :) \r\n\r\n","description_html":"\u003cp\u003eGiven a 3 element RGB vector corresponding to a color (given by the MATLAB color spec \u003ca href = \"http://www.mathworks.com/help/matlab/ref/colorspec.html\"\u003ehttp://www.mathworks.com/help/matlab/ref/colorspec.html\u003c/a\u003e), return the corresponding hex value string associated with it. This hex value string is often used when coding in HTML to specify a color.\u003c/p\u003e\u003cp\u003eFor example, given the vector [0, 1, 1], you would return the string 00FFFF and given the vector [.5 .5 .2], you would return the string 7F7F33. We will assume that in this case once we multiply the vector by 255, we will round down to the nearest integer. If anyone thinks that we should not assume rounding down, feel free to comment :)\u003c/p\u003e","function_template":"function hexString = rgb2hex(rgbColor)\r\n  hexString = rgbColor;\r\nend","test_suite":"%%\r\nx = [0,0,0.0001];\r\ny_correct = '000000';\r\nassert(isequal(rgb2hex(x),y_correct))\r\n\r\n%%\r\nx = [1,1,1];\r\ny_correct = 'FFFFFF';\r\nassert(isequal(rgb2hex(x),y_correct))\r\n\r\n%%\r\nx = [.5,.5,.2];\r\ny_correct = '7F7F33';\r\nassert(isequal(rgb2hex(x),y_correct))","published":true,"deleted":false,"likes_count":2,"comments_count":1,"created_by":3743,"edited_by":null,"edited_at":null,"deleted_by":null,"deleted_at":null,"solvers_count":141,"test_suite_updated_at":null,"rescore_all_solutions":false,"group_id":1,"created_at":"2013-10-20T03:34:55.000Z","updated_at":"2026-04-11T10:22:52.000Z","published_at":"2013-10-20T03:34:55.000Z","restored_at":null,"restored_by":null,"spam":false,"simulink":false,"admin_reviewed":false,"description_opc":"{\"relationships\":[{\"relationshipType\":\"http://schemas.mathworks.com/matlab/code/2013/relationships/document\",\"targetMode\":\"\",\"relationshipId\":\"rId1\",\"target\":\"/matlab/document.xml\"},{\"relationshipType\":\"http://schemas.mathworks.com/matlab/code/2013/relationships/output\",\"targetMode\":\"\",\"relationshipId\":\"rId2\",\"target\":\"/matlab/output.xml\"}],\"parts\":[{\"partUri\":\"/matlab/document.xml\",\"relationship\":[],\"contentType\":\"application/vnd.mathworks.matlab.code.document+xml\",\"content\":\"\u003c?xml version=\\\"1.0\\\" encoding=\\\"UTF-8\\\"?\u003e\\n\u003cw:document xmlns:w=\\\"http://schemas.openxmlformats.org/wordprocessingml/2006/main\\\"\u003e\u003cw:body\u003e\u003cw:p\u003e\u003cw:pPr\u003e\u003cw:pStyle w:val=\\\"text\\\"/\u003e\u003c/w:pPr\u003e\u003cw:r\u003e\u003cw:t\u003eGiven a 3 element RGB vector corresponding to a color (given by the MATLAB color spec\u003c/w:t\u003e\u003c/w:r\u003e\u003cw:r\u003e\u003cw:t\u003e \u003c/w:t\u003e\u003c/w:r\u003e\u003cw:hyperlink w:docLocation=\\\"http://www.mathworks.com/help/matlab/ref/colorspec.html\\\"\u003e\u003cw:r\u003e\u003cw:t\u003ehttp://www.mathworks.com/help/matlab/ref/colorspec.html\u003c/w:t\u003e\u003c/w:r\u003e\u003c/w:hyperlink\u003e\u003cw:r\u003e\u003cw:t\u003e), return the corresponding hex value string associated with it. This hex value string is often used when coding in HTML to specify a color.\u003c/w:t\u003e\u003c/w:r\u003e\u003c/w:p\u003e\u003cw:p\u003e\u003cw:pPr\u003e\u003cw:pStyle w:val=\\\"text\\\"/\u003e\u003c/w:pPr\u003e\u003cw:r\u003e\u003cw:t\u003eFor example, given the vector [0, 1, 1], you would return the string 00FFFF and given the vector [.5 .5 .2], you would return the string 7F7F33. We will assume that in this case once we multiply the vector by 255, we will round down to the nearest integer. If anyone thinks that we should not assume rounding down, feel free to comment :)\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":43603,"title":"Convert array of decimal numbers into  hexadecimal numbers array.","description":"Convert array of decimal numbers into  hexadecimal numbers array.\r\n\r\nExample \r\n\r\nx =[ 32    33    34    35    36    37    38    39    40    41    42    43   44 45]\r\n\r\nres= ['20' ;'21' ;'22'; '23' ;'24' ;'25' ;'26' ;'27' ;'28'; '29' ;'2A'; '2B' ;'2C'; '2D'];","description_html":"\u003cp\u003eConvert array of decimal numbers into  hexadecimal numbers array.\u003c/p\u003e\u003cp\u003eExample\u003c/p\u003e\u003cp\u003ex =[ 32    33    34    35    36    37    38    39    40    41    42    43   44 45]\u003c/p\u003e\u003cp\u003eres= ['20' ;'21' ;'22'; '23' ;'24' ;'25' ;'26' ;'27' ;'28'; '29' ;'2A'; '2B' ;'2C'; '2D'];\u003c/p\u003e","function_template":"function y = Converter(x)\r\n  y = x;\r\nend","test_suite":"%%\r\nx = 1;\r\ny_correct = '1';\r\nassert(isequal(Converter(x),y_correct))\r\n%%\r\nx = 1:5;\r\ny_correct = ['1' '2' '3' '4' '5'];\r\nassert(isequal(Converter(x),y_correct'))\r\n%%\r\nx = 32:45;\r\ny_correct = ['20' ;'21' ;'22'; '23' ;'24' ;'25' ;'26' ;'27' ;'28'; '29' ;'2A'; '2B' ;'2C'; '2D'];\r\nassert(isequal(Converter(x),y_correct))","published":true,"deleted":false,"likes_count":2,"comments_count":2,"created_by":90467,"edited_by":null,"edited_at":null,"deleted_by":null,"deleted_at":null,"solvers_count":68,"test_suite_updated_at":null,"rescore_all_solutions":false,"group_id":1,"created_at":"2016-10-23T13:16:26.000Z","updated_at":"2026-02-12T12:13:15.000Z","published_at":"2016-10-23T13:16:26.000Z","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\u003eConvert array of decimal numbers into hexadecimal numbers array.\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\u003eExample\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\u003ex =[ 32 33 34 35 36 37 38 39 40 41 42 43 44 45]\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\u003eres= ['20' ;'21' ;'22'; '23' ;'24' ;'25' ;'26' ;'27' ;'28'; '29' ;'2A'; '2B' ;'2C'; '2D'];\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":540,"title":"Convert hex color specification to MATLAB RGB","description":"Here's something that comes up all the time if you deal with web pages.\r\n\r\nGiven a \u003chttp://www.w3schools.com/html/html_colors.asp hexadecimal color specification\u003e of the form #FFFFFF, convert it to a 3 element MATLAB color specification. Remember that MATLAB RGB color values are between 0 and 1.\r\n\r\nThe input is a string starting with '#'. The output should be a 1-by-3 vector.\r\n\r\nExamples:\r\n\r\n Input  '#0000FF'\r\n Output [0 0 1]\r\n \r\n Input  '#33FF00'\r\n Output [0.2 1 0]","description_html":"\u003cp\u003eHere's something that comes up all the time if you deal with web pages.\u003c/p\u003e\u003cp\u003eGiven a \u003ca href=\"http://www.w3schools.com/html/html_colors.asp\"\u003ehexadecimal color specification\u003c/a\u003e of the form #FFFFFF, convert it to a 3 element MATLAB color specification. Remember that MATLAB RGB color values are between 0 and 1.\u003c/p\u003e\u003cp\u003eThe input is a string starting with '#'. The output should be a 1-by-3 vector.\u003c/p\u003e\u003cp\u003eExamples:\u003c/p\u003e\u003cpre\u003e Input  '#0000FF'\r\n Output [0 0 1]\u003c/pre\u003e\u003cpre\u003e Input  '#33FF00'\r\n Output [0.2 1 0]\u003c/pre\u003e","function_template":"function rgb = color_hex2rgb(hex)\r\n  rgb = [0 0 0];\r\nend","test_suite":"%%\r\nhex =  '#0000FF';\r\nrgb = [0 0 1];\r\nassert(isequal(color_hex2rgb(hex),rgb))\r\n\r\n%%\r\nhex =  '#33FF00';\r\nrgb = [0.2 1 0];\r\nassert(isequal(color_hex2rgb(hex),rgb))\r\n\r\n%%\r\nhex =  '#FFCCFF';\r\nrgb = [1 0.8 1];\r\nassert(isequal(color_hex2rgb(hex),rgb))\r\n\r\n%%\r\nhex =  '#999999';\r\nrgb = [.6 .6 .6];\r\nassert(isequal(color_hex2rgb(hex),rgb))","published":true,"deleted":false,"likes_count":7,"comments_count":0,"created_by":7,"edited_by":null,"edited_at":null,"deleted_by":null,"deleted_at":null,"solvers_count":259,"test_suite_updated_at":null,"rescore_all_solutions":false,"group_id":1,"created_at":"2012-03-30T18:18:52.000Z","updated_at":"2026-04-11T10:21:21.000Z","published_at":"2012-03-30T18:26:28.000Z","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\u003eHere's something that comes up all the time if you deal with web pages.\u003c/w:t\u003e\u003c/w:r\u003e\u003c/w:p\u003e\u003cw:p\u003e\u003cw:pPr\u003e\u003cw:pStyle w:val=\\\"text\\\"/\u003e\u003c/w:pPr\u003e\u003cw:r\u003e\u003cw:t\u003eGiven a\u003c/w:t\u003e\u003c/w:r\u003e\u003cw:r\u003e\u003cw:t\u003e \u003c/w:t\u003e\u003c/w:r\u003e\u003cw:hyperlink w:docLocation=\\\"http://www.w3schools.com/html/html_colors.asp\\\"\u003e\u003cw:r\u003e\u003cw:t\u003ehexadecimal color specification\u003c/w:t\u003e\u003c/w:r\u003e\u003c/w:hyperlink\u003e\u003cw:r\u003e\u003cw:t\u003e of the form #FFFFFF, convert it to a 3 element MATLAB color specification. Remember that MATLAB RGB color values are between 0 and 1.\u003c/w:t\u003e\u003c/w:r\u003e\u003c/w:p\u003e\u003cw:p\u003e\u003cw:pPr\u003e\u003cw:pStyle w:val=\\\"text\\\"/\u003e\u003c/w:pPr\u003e\u003cw:r\u003e\u003cw:t\u003eThe input is a string starting with '#'. The output should be a 1-by-3 vector.\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\u003eExamples:\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[ Input  '#0000FF'\\n Output [0 0 1]\\n\\n Input  '#33FF00'\\n Output [0.2 1 0]]]\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":1948,"title":"Convert this color - RGB Vector to Hex String","description":"Given a 3 element RGB vector corresponding to a color (given by the MATLAB color spec \u003chttp://www.mathworks.com/help/matlab/ref/colorspec.html\u003e), return the corresponding hex value string associated with it. This hex value string is often used when coding in HTML to specify a color. \r\n\r\nFor example, given the vector [0, 1, 1], you would return the string 00FFFF and given the vector [.5 .5 .2], you would return the string 7F7F33. We will assume that in this case once we multiply the vector by 255, we will round down to the nearest integer. If anyone thinks that we should not assume rounding down, feel free to comment :) \r\n\r\n","description_html":"\u003cp\u003eGiven a 3 element RGB vector corresponding to a color (given by the MATLAB color spec \u003ca href = \"http://www.mathworks.com/help/matlab/ref/colorspec.html\"\u003ehttp://www.mathworks.com/help/matlab/ref/colorspec.html\u003c/a\u003e), return the corresponding hex value string associated with it. This hex value string is often used when coding in HTML to specify a color.\u003c/p\u003e\u003cp\u003eFor example, given the vector [0, 1, 1], you would return the string 00FFFF and given the vector [.5 .5 .2], you would return the string 7F7F33. We will assume that in this case once we multiply the vector by 255, we will round down to the nearest integer. If anyone thinks that we should not assume rounding down, feel free to comment :)\u003c/p\u003e","function_template":"function hexString = rgb2hex(rgbColor)\r\n  hexString = rgbColor;\r\nend","test_suite":"%%\r\nx = [0,0,0.0001];\r\ny_correct = '000000';\r\nassert(isequal(rgb2hex(x),y_correct))\r\n\r\n%%\r\nx = [1,1,1];\r\ny_correct = 'FFFFFF';\r\nassert(isequal(rgb2hex(x),y_correct))\r\n\r\n%%\r\nx = [.5,.5,.2];\r\ny_correct = '7F7F33';\r\nassert(isequal(rgb2hex(x),y_correct))","published":true,"deleted":false,"likes_count":2,"comments_count":1,"created_by":3743,"edited_by":null,"edited_at":null,"deleted_by":null,"deleted_at":null,"solvers_count":141,"test_suite_updated_at":null,"rescore_all_solutions":false,"group_id":1,"created_at":"2013-10-20T03:34:55.000Z","updated_at":"2026-04-11T10:22:52.000Z","published_at":"2013-10-20T03:34:55.000Z","restored_at":null,"restored_by":null,"spam":false,"simulink":false,"admin_reviewed":false,"description_opc":"{\"relationships\":[{\"relationshipType\":\"http://schemas.mathworks.com/matlab/code/2013/relationships/document\",\"targetMode\":\"\",\"relationshipId\":\"rId1\",\"target\":\"/matlab/document.xml\"},{\"relationshipType\":\"http://schemas.mathworks.com/matlab/code/2013/relationships/output\",\"targetMode\":\"\",\"relationshipId\":\"rId2\",\"target\":\"/matlab/output.xml\"}],\"parts\":[{\"partUri\":\"/matlab/document.xml\",\"relationship\":[],\"contentType\":\"application/vnd.mathworks.matlab.code.document+xml\",\"content\":\"\u003c?xml version=\\\"1.0\\\" encoding=\\\"UTF-8\\\"?\u003e\\n\u003cw:document xmlns:w=\\\"http://schemas.openxmlformats.org/wordprocessingml/2006/main\\\"\u003e\u003cw:body\u003e\u003cw:p\u003e\u003cw:pPr\u003e\u003cw:pStyle w:val=\\\"text\\\"/\u003e\u003c/w:pPr\u003e\u003cw:r\u003e\u003cw:t\u003eGiven a 3 element RGB vector corresponding to a color (given by the MATLAB color spec\u003c/w:t\u003e\u003c/w:r\u003e\u003cw:r\u003e\u003cw:t\u003e \u003c/w:t\u003e\u003c/w:r\u003e\u003cw:hyperlink w:docLocation=\\\"http://www.mathworks.com/help/matlab/ref/colorspec.html\\\"\u003e\u003cw:r\u003e\u003cw:t\u003ehttp://www.mathworks.com/help/matlab/ref/colorspec.html\u003c/w:t\u003e\u003c/w:r\u003e\u003c/w:hyperlink\u003e\u003cw:r\u003e\u003cw:t\u003e), return the corresponding hex value string associated with it. This hex value string is often used when coding in HTML to specify a color.\u003c/w:t\u003e\u003c/w:r\u003e\u003c/w:p\u003e\u003cw:p\u003e\u003cw:pPr\u003e\u003cw:pStyle w:val=\\\"text\\\"/\u003e\u003c/w:pPr\u003e\u003cw:r\u003e\u003cw:t\u003eFor example, given the vector [0, 1, 1], you would return the string 00FFFF and given the vector [.5 .5 .2], you would return the string 7F7F33. We will assume that in this case once we multiply the vector by 255, we will round down to the nearest integer. If anyone thinks that we should not assume rounding down, feel free to comment :)\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 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