{"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":44939,"title":"What time can I drive after drinking?","description":"At T o'clock, after a hard day of Matlab, I immediately start drinking and treat myself to N pints of tasty beer. Each beer I drink has 3 standard units (strong beer - ~5.2%) and my body processes 1 unit of alcohol each hour (the average). Assume all beer is consumed instantly.\r\n\r\nIn England the legal limit for driving is approximately 2 units of alcohol in your blood, assuming this at what time can I legally drive again?\r\n\r\nThe input N is number of beers drank and T the time I start drinking (as a 24 hour integer). The output H is the hour I may drive again (24 hour integer) and the output Y is how many days (where 0 is the same day, 1 is the following day etc).\r\n\r\nE.g. If I drink 1 beer (N=1) at 7 pm (T=19), 1 of the units will be processed in 1 hour and I can 'safely' drive with 2 units in my blood. The output is D=0, H=20.\r\n\r\nhttps://www.nhs.uk/common-health-questions/lifestyle/how-long-does-alcohol-stay-in-your-blood/","description_html":"\u003cp\u003eAt T o'clock, after a hard day of Matlab, I immediately start drinking and treat myself to N pints of tasty beer. Each beer I drink has 3 standard units (strong beer - ~5.2%) and my body processes 1 unit of alcohol each hour (the average). Assume all beer is consumed instantly.\u003c/p\u003e\u003cp\u003eIn England the legal limit for driving is approximately 2 units of alcohol in your blood, assuming this at what time can I legally drive again?\u003c/p\u003e\u003cp\u003eThe input N is number of beers drank and T the time I start drinking (as a 24 hour integer). The output H is the hour I may drive again (24 hour integer) and the output Y is how many days (where 0 is the same day, 1 is the following day etc).\u003c/p\u003e\u003cp\u003eE.g. If I drink 1 beer (N=1) at 7 pm (T=19), 1 of the units will be processed in 1 hour and I can 'safely' drive with 2 units in my blood. The output is D=0, H=20.\u003c/p\u003e\u003cp\u003ehttps://www.nhs.uk/common-health-questions/lifestyle/how-long-does-alcohol-stay-in-your-blood/\u003c/p\u003e","function_template":"function [D,H] = driveTime(T,N)\r\n  \r\nend","test_suite":"%%\r\nT = 19;\r\nN = 1;\r\n\r\nD_correct = 0;\r\nH_correct = 20;\r\n[D,H]=driveTime(T,N)\r\nassert(isequal(D,D_correct))\r\nassert(isequal(H,H_correct))\r\n\r\n%%\r\nT = 17;\r\nN = 5;\r\n\r\nD_correct = 1;\r\nH_correct = 6;\r\n[D,H]=driveTime(T,N)\r\nassert(isequal(D,D_correct))\r\nassert(isequal(H,H_correct))\r\n\r\n\r\n%%\r\nT = 19;\r\nN = 10;\r\n\r\nD_correct = 1;\r\nH_correct = 23;\r\n[D,H]=driveTime(T,N)\r\nassert(isequal(D,D_correct))\r\nassert(isequal(H,H_correct))\r\n\r\n%%\r\nT = 23;\r\nN = 20;\r\n\r\nD_correct = 3;\r\nH_correct = 9;\r\n[D,H]=driveTime(T,N)\r\nassert(isequal(D,D_correct))\r\nassert(isequal(H,H_correct))","published":true,"deleted":false,"likes_count":2,"comments_count":0,"created_by":297832,"edited_by":null,"edited_at":null,"deleted_by":null,"deleted_at":null,"solvers_count":20,"test_suite_updated_at":null,"rescore_all_solutions":false,"group_id":1,"created_at":"2019-08-06T08:18:37.000Z","updated_at":"2026-01-23T14:33:16.000Z","published_at":"2019-08-06T08:18:37.000Z","restored_at":"2022-02-16T22:16:16.000Z","restored_by":null,"spam":false,"simulink":false,"admin_reviewed":true,"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\u003eAt T o'clock, after a hard day of Matlab, I immediately start drinking and treat myself to N pints of tasty beer. Each beer I drink has 3 standard units (strong beer - ~5.2%) and my body processes 1 unit of alcohol each hour (the average). Assume all beer is consumed instantly.\u003c/w:t\u003e\u003c/w:r\u003e\u003c/w:p\u003e\u003cw:p\u003e\u003cw:pPr\u003e\u003cw:pStyle w:val=\\\"text\\\"/\u003e\u003cw:jc w:val=\\\"left\\\"/\u003e\u003c/w:pPr\u003e\u003cw:r\u003e\u003cw:t\u003eIn England the legal limit for driving is approximately 2 units of alcohol in your blood, assuming this at what time can I legally drive again?\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 input N is number of beers drank and T the time I start drinking (as a 24 hour integer). The output H is the hour I may drive again (24 hour integer) and the output Y is how many days (where 0 is the same day, 1 is the following day etc).\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\u003eE.g. If I drink 1 beer (N=1) at 7 pm (T=19), 1 of the units will be processed in 1 hour and I can 'safely' drive with 2 units in my blood. The output is D=0, H=20.\u003c/w:t\u003e\u003c/w:r\u003e\u003c/w:p\u003e\u003cw:p\u003e\u003cw:pPr\u003e\u003cw:pStyle w:val=\\\"text\\\"/\u003e\u003cw:jc w:val=\\\"left\\\"/\u003e\u003c/w:pPr\u003e\u003cw:r\u003e\u003cw:t\u003ehttps://www.nhs.uk/common-health-questions/lifestyle/how-long-does-alcohol-stay-in-your-blood/\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":44481,"title":"How many Fibonacci numbers? ","description":"Find the number of unique Fibonacci numbers (don't count repeats) in a vector of positive integers.\r\n\r\nExample:\r\n\r\n x = [1 2 3 4 5 6 7 8 8]\r\n y = 5","description_html":"\u003cp\u003eFind the number of unique Fibonacci numbers (don't count repeats) in a vector of positive integers.\u003c/p\u003e\u003cp\u003eExample:\u003c/p\u003e\u003cpre\u003e x = [1 2 3 4 5 6 7 8 8]\r\n y = 5\u003c/pre\u003e","function_template":"function y = fib_count(x)\r\n  y = x;\r\nend","test_suite":"%%\r\nx = [1 4 5 7 10 11 13 20 21 23 29];\r\ny_correct = 4;\r\nassert(isequal(fib_count(x),y_correct))\r\n\r\n%%\r\nx = 5:5:100;\r\ny_correct = 2;\r\nassert(isequal(fib_count(x),y_correct))\r\n\r\n%%\r\n%x = [2 2 3 3 3 3 3 3 5 5 6 6 6 7 86168291600238450732788312165664788095941068326060883324529903470149056115823592713458328176574447204501];\r\n% Changed the test suite to a number that can be represented as an integer in DOUBLE\r\nx = [2 2 3 3 3 3 3 3 5 5 6 6 6 7 8944394323791465];\r\ny_correct = 3;\r\nassert(isequal(fib_count(x),y_correct))\r\n\r\n%%\r\nx = [2 2 3 3 3 3 3 3 5 5 6 6 6 7 8944394323791464];\r\ny_correct = 4;\r\nassert(isequal(fib_count(x),y_correct))\r\n","published":true,"deleted":false,"likes_count":5,"comments_count":9,"created_by":172785,"edited_by":null,"edited_at":null,"deleted_by":null,"deleted_at":null,"solvers_count":984,"test_suite_updated_at":"2019-02-08T20:17:38.000Z","rescore_all_solutions":true,"group_id":122,"created_at":"2018-01-06T17:29:02.000Z","updated_at":"2026-03-31T16:35:24.000Z","published_at":"2018-01-06T17:29:06.000Z","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\u003eFind the number of unique Fibonacci numbers (don't count repeats) in a vector of positive integers.\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\u003eExample:\u003c/w:t\u003e\u003c/w:r\u003e\u003c/w:p\u003e\u003cw:p\u003e\u003cw:pPr\u003e\u003cw:pStyle w:val=\\\"code\\\"/\u003e\u003c/w:pPr\u003e\u003cw:r\u003e\u003cw:t\u003e\u003c![CDATA[ x = [1 2 3 4 5 6 7 8 8]\\n y = 5]]\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":44939,"title":"What time can I drive after drinking?","description":"At T o'clock, after a hard day of Matlab, I immediately start drinking and treat myself to N pints of tasty beer. Each beer I drink has 3 standard units (strong beer - ~5.2%) and my body processes 1 unit of alcohol each hour (the average). Assume all beer is consumed instantly.\r\n\r\nIn England the legal limit for driving is approximately 2 units of alcohol in your blood, assuming this at what time can I legally drive again?\r\n\r\nThe input N is number of beers drank and T the time I start drinking (as a 24 hour integer). The output H is the hour I may drive again (24 hour integer) and the output Y is how many days (where 0 is the same day, 1 is the following day etc).\r\n\r\nE.g. If I drink 1 beer (N=1) at 7 pm (T=19), 1 of the units will be processed in 1 hour and I can 'safely' drive with 2 units in my blood. The output is D=0, H=20.\r\n\r\nhttps://www.nhs.uk/common-health-questions/lifestyle/how-long-does-alcohol-stay-in-your-blood/","description_html":"\u003cp\u003eAt T o'clock, after a hard day of Matlab, I immediately start drinking and treat myself to N pints of tasty beer. Each beer I drink has 3 standard units (strong beer - ~5.2%) and my body processes 1 unit of alcohol each hour (the average). Assume all beer is consumed instantly.\u003c/p\u003e\u003cp\u003eIn England the legal limit for driving is approximately 2 units of alcohol in your blood, assuming this at what time can I legally drive again?\u003c/p\u003e\u003cp\u003eThe input N is number of beers drank and T the time I start drinking (as a 24 hour integer). The output H is the hour I may drive again (24 hour integer) and the output Y is how many days (where 0 is the same day, 1 is the following day etc).\u003c/p\u003e\u003cp\u003eE.g. If I drink 1 beer (N=1) at 7 pm (T=19), 1 of the units will be processed in 1 hour and I can 'safely' drive with 2 units in my blood. The output is D=0, H=20.\u003c/p\u003e\u003cp\u003ehttps://www.nhs.uk/common-health-questions/lifestyle/how-long-does-alcohol-stay-in-your-blood/\u003c/p\u003e","function_template":"function [D,H] = driveTime(T,N)\r\n  \r\nend","test_suite":"%%\r\nT = 19;\r\nN = 1;\r\n\r\nD_correct = 0;\r\nH_correct = 20;\r\n[D,H]=driveTime(T,N)\r\nassert(isequal(D,D_correct))\r\nassert(isequal(H,H_correct))\r\n\r\n%%\r\nT = 17;\r\nN = 5;\r\n\r\nD_correct = 1;\r\nH_correct = 6;\r\n[D,H]=driveTime(T,N)\r\nassert(isequal(D,D_correct))\r\nassert(isequal(H,H_correct))\r\n\r\n\r\n%%\r\nT = 19;\r\nN = 10;\r\n\r\nD_correct = 1;\r\nH_correct = 23;\r\n[D,H]=driveTime(T,N)\r\nassert(isequal(D,D_correct))\r\nassert(isequal(H,H_correct))\r\n\r\n%%\r\nT = 23;\r\nN = 20;\r\n\r\nD_correct = 3;\r\nH_correct = 9;\r\n[D,H]=driveTime(T,N)\r\nassert(isequal(D,D_correct))\r\nassert(isequal(H,H_correct))","published":true,"deleted":false,"likes_count":2,"comments_count":0,"created_by":297832,"edited_by":null,"edited_at":null,"deleted_by":null,"deleted_at":null,"solvers_count":20,"test_suite_updated_at":null,"rescore_all_solutions":false,"group_id":1,"created_at":"2019-08-06T08:18:37.000Z","updated_at":"2026-01-23T14:33:16.000Z","published_at":"2019-08-06T08:18:37.000Z","restored_at":"2022-02-16T22:16:16.000Z","restored_by":null,"spam":false,"simulink":false,"admin_reviewed":true,"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\u003eAt T o'clock, after a hard day of Matlab, I immediately start drinking and treat myself to N pints of tasty beer. Each beer I drink has 3 standard units (strong beer - ~5.2%) and my body processes 1 unit of alcohol each hour (the average). Assume all beer is consumed instantly.\u003c/w:t\u003e\u003c/w:r\u003e\u003c/w:p\u003e\u003cw:p\u003e\u003cw:pPr\u003e\u003cw:pStyle w:val=\\\"text\\\"/\u003e\u003cw:jc w:val=\\\"left\\\"/\u003e\u003c/w:pPr\u003e\u003cw:r\u003e\u003cw:t\u003eIn England the legal limit for driving is approximately 2 units of alcohol in your blood, assuming this at what time can I legally drive again?\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 input N is number of beers drank and T the time I start drinking (as a 24 hour integer). The output H is the hour I may drive again (24 hour integer) and the output Y is how many days (where 0 is the same day, 1 is the following day etc).\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\u003eE.g. If I drink 1 beer (N=1) at 7 pm (T=19), 1 of the units will be processed in 1 hour and I can 'safely' drive with 2 units in my blood. The output is D=0, H=20.\u003c/w:t\u003e\u003c/w:r\u003e\u003c/w:p\u003e\u003cw:p\u003e\u003cw:pPr\u003e\u003cw:pStyle w:val=\\\"text\\\"/\u003e\u003cw:jc w:val=\\\"left\\\"/\u003e\u003c/w:pPr\u003e\u003cw:r\u003e\u003cw:t\u003ehttps://www.nhs.uk/common-health-questions/lifestyle/how-long-does-alcohol-stay-in-your-blood/\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":44481,"title":"How many Fibonacci numbers? ","description":"Find the number of unique Fibonacci numbers (don't count repeats) in a vector of positive integers.\r\n\r\nExample:\r\n\r\n x = [1 2 3 4 5 6 7 8 8]\r\n y = 5","description_html":"\u003cp\u003eFind the number of unique Fibonacci numbers (don't count repeats) in a vector of positive integers.\u003c/p\u003e\u003cp\u003eExample:\u003c/p\u003e\u003cpre\u003e x = [1 2 3 4 5 6 7 8 8]\r\n y = 5\u003c/pre\u003e","function_template":"function y = fib_count(x)\r\n  y = x;\r\nend","test_suite":"%%\r\nx = [1 4 5 7 10 11 13 20 21 23 29];\r\ny_correct = 4;\r\nassert(isequal(fib_count(x),y_correct))\r\n\r\n%%\r\nx = 5:5:100;\r\ny_correct = 2;\r\nassert(isequal(fib_count(x),y_correct))\r\n\r\n%%\r\n%x = [2 2 3 3 3 3 3 3 5 5 6 6 6 7 86168291600238450732788312165664788095941068326060883324529903470149056115823592713458328176574447204501];\r\n% Changed the test suite to a number that can be represented as an integer in DOUBLE\r\nx = [2 2 3 3 3 3 3 3 5 5 6 6 6 7 8944394323791465];\r\ny_correct = 3;\r\nassert(isequal(fib_count(x),y_correct))\r\n\r\n%%\r\nx = [2 2 3 3 3 3 3 3 5 5 6 6 6 7 8944394323791464];\r\ny_correct = 4;\r\nassert(isequal(fib_count(x),y_correct))\r\n","published":true,"deleted":false,"likes_count":5,"comments_count":9,"created_by":172785,"edited_by":null,"edited_at":null,"deleted_by":null,"deleted_at":null,"solvers_count":984,"test_suite_updated_at":"2019-02-08T20:17:38.000Z","rescore_all_solutions":true,"group_id":122,"created_at":"2018-01-06T17:29:02.000Z","updated_at":"2026-03-31T16:35:24.000Z","published_at":"2018-01-06T17:29:06.000Z","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 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