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% since diff(1, 2) \u003c= 1 and diff(7, 8) \u003c= 1\r\n","description_html":"\u003cp\u003eBased on a question on \u003ca href = \"http://www.mathworks.com/matlabcentral/answers/\"\u003eMATLAB Answers\u003c/a\u003e.\u003c/p\u003e\u003cp\u003eFind all the elements of a vector whose difference, regardless of position is less or equal than a given range.\u003c/p\u003e\u003cp\u003eExample\u003c/p\u003e\u003cpre\u003e A = [1 4 7 10 2 8];\r\n range = 1;\r\n inrange = [1 0 1 0 1 1]; % since diff(1, 2) \u0026lt;= 1 and diff(7, 8) \u0026lt;= 1\u003c/pre\u003e","function_template":"function tf = isinrange(A, range)\r\n  false;\r\nend\r\n","test_suite":"%%\r\nA = [1 4 7 10 2 8];\r\nrange = 1;\r\ninrange = [1 0 1 0 1 1];\r\nassert(isequal(isinrange(A, range),inrange))\r\n\r\n%%\r\nA = [10 15 18 12 3 7 2];\r\nrange = 2;\r\ninrange = [1 0 0 1 1 0 1];\r\nassert(isequal(isinrange(A, range),inrange))\r\n\r\n\r\n%%\r\nA = [10 15 18 12 4 7 2];\r\nrange = 3;\r\ninrange = [1 1 1 1 1 1 1];\r\nassert(isequal(isinrange(A, range),inrange))\r\n\r\n%%\r\nA = [10 15 18 12 4 7 2];\r\nrange = 1;\r\ninrange = [0 0 0 0 0 0 0];\r\nassert(isequal(isinrange(A, range),inrange))\r\n","published":true,"deleted":false,"likes_count":2,"comments_count":1,"created_by":999,"edited_by":null,"edited_at":null,"deleted_by":null,"deleted_at":null,"solvers_count":74,"test_suite_updated_at":null,"rescore_all_solutions":false,"group_id":39,"created_at":"2014-09-15T19:10:47.000Z","updated_at":"2026-04-02T08:15:03.000Z","published_at":"2014-09-15T19:10:47.000Z","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\u003eBased on a question on\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/matlabcentral/answers/\\\"\u003e\u003cw:r\u003e\u003cw:t\u003eMATLAB Answers\u003c/w:t\u003e\u003c/w:r\u003e\u003c/w:hyperlink\u003e\u003cw:r\u003e\u003cw:t\u003e.\u003c/w:t\u003e\u003c/w:r\u003e\u003c/w:p\u003e\u003cw:p\u003e\u003cw:pPr\u003e\u003cw:pStyle w:val=\\\"text\\\"/\u003e\u003c/w:pPr\u003e\u003cw:r\u003e\u003cw:t\u003eFind all the elements of a vector whose difference, regardless of position is less or equal than a given range.\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[ A = [1 4 7 10 2 8];\\n range = 1;\\n inrange = [1 0 1 0 1 1]; % since diff(1, 2) \u003c= 1 and diff(7, 8) \u003c= 1]]\u003e\u003c/w:t\u003e\u003c/w:r\u003e\u003c/w:p\u003e\u003c/w:body\u003e\u003c/w:document\u003e\"},{\"partUri\":\"/matlab/output.xml\",\"contentType\":\"text/xml\",\"content\":\"\u003c?xml version=\\\"1.0\\\" encoding=\\\"UTF-8\\\" standalone=\\\"no\\\" ?\u003e\u003cembeddedOutputs\u003e\u003cmetaData\u003e\u003cevaluationState\u003emanual\u003c/evaluationState\u003e\u003clayoutState\u003ecode\u003c/layoutState\u003e\u003coutputStatus\u003eready\u003c/outputStatus\u003e\u003c/metaData\u003e\u003coutputArray type=\\\"array\\\"/\u003e\u003cregionArray type=\\\"array\\\"/\u003e\u003c/embeddedOutputs\u003e\"}]}"},{"id":42319,"title":"How close to a hole","description":"Suppose you have a description of good places (ones) and bad places (zeros). You want to know your distance from a bad place (in the sense of your location in the array/vector). For example:\r\n\r\n  tfs = [0 0 0 1 1 1 1 1 0 0 0 1 1 1 0 0 0];\r\n\r\nFor this scenario, we want to have:\r\n\r\n  distancesFromHoles = [0 0 0 1 2 3 2 1 0 0 0 1 2 1 0 0 0];\r\n\r\nLets assume that outside the sequence there are zeros. For example:\r\n\r\n                 tfs = [1 1 1 0 0 1 1 0 1 1 1 1 1 1 1];\r\n  distancesFromHoles = [1 2 1 0 0 1 1 0 1 2 3 4 3 2 1];\r\n","description_html":"\u003cp\u003eSuppose you have a description of good places (ones) and bad places (zeros). You want to know your distance from a bad place (in the sense of your location in the array/vector). For example:\u003c/p\u003e\u003cpre class=\"language-matlab\"\u003etfs = [0 0 0 1 1 1 1 1 0 0 0 1 1 1 0 0 0];\r\n\u003c/pre\u003e\u003cp\u003eFor this scenario, we want to have:\u003c/p\u003e\u003cpre class=\"language-matlab\"\u003edistancesFromHoles = [0 0 0 1 2 3 2 1 0 0 0 1 2 1 0 0 0];\r\n\u003c/pre\u003e\u003cp\u003eLets assume that outside the sequence there are zeros. For example:\u003c/p\u003e\u003cpre\u003e                 tfs = [1 1 1 0 0 1 1 0 1 1 1 1 1 1 1];\r\n  distancesFromHoles = [1 2 1 0 0 1 1 0 1 2 3 4 3 2 1];\u003c/pre\u003e","function_template":"function y = distancesFromHoles(x)\r\n  d = diff([0 v]);\r\nend","test_suite":"%%\r\n        x = [0 0 1 1 1 0];\r\ny_correct = [0 0 1 2 1 0];\r\nassert(isequal(distancesFromHoles(x),y_correct))\r\n\r\n%%\r\n        x = [1 1 1 0 0 1 1 0 1 1 1 1 1 1 1];\r\ny_correct = [1 2 1 0 0 1 1 0 1 2 3 4 3 2 1];\r\nassert(isequal(distancesFromHoles(x),y_correct))\r\n\r\n%%\r\nx = [ones(1,10),0,ones(1,10)];\r\ny_correct = [1:5,5:-1:0,1:5,5:-1:1];\r\nassert(isequal(distancesFromHoles(x),y_correct))\r\n\r\n%%\r\n        x = [1 1 1 0 0 0 0 0 0 0 0 0 1 1 1];\r\ny_correct = [1 2 1 0 0 0 0 0 0 0 0 0 1 2 1];\r\nassert(isequal(distancesFromHoles(x),y_correct))\r\n\r\n%%\r\nx = ones(1,101);\r\ny_correct = [1:51,50:-1:1];\r\nassert(isequal(distancesFromHoles(x),y_correct))\r\n\r\n%%\r\nx = [repmat([1,0],[1,50]),1];\r\ny_correct = x;\r\nassert(isequal(distancesFromHoles(x),y_correct))","published":true,"deleted":false,"likes_count":2,"comments_count":1,"created_by":44119,"edited_by":null,"edited_at":null,"deleted_by":null,"deleted_at":null,"solvers_count":58,"test_suite_updated_at":"2018-03-03T19:22:09.000Z","rescore_all_solutions":false,"group_id":39,"created_at":"2015-05-17T08:00:09.000Z","updated_at":"2026-04-02T08:20:08.000Z","published_at":"2015-05-17T08:01:59.000Z","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\u003eSuppose you have a description of good places (ones) and bad places (zeros). You want to know your distance from a bad place (in the sense of your location in the array/vector). For example:\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[tfs = [0 0 0 1 1 1 1 1 0 0 0 1 1 1 0 0 0];]]\u003e\u003c/w:t\u003e\u003c/w:r\u003e\u003c/w:p\u003e\u003cw:p\u003e\u003cw:pPr\u003e\u003cw:pStyle w:val=\\\"text\\\"/\u003e\u003c/w:pPr\u003e\u003cw:r\u003e\u003cw:t\u003eFor this scenario, we want to have:\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[distancesFromHoles = [0 0 0 1 2 3 2 1 0 0 0 1 2 1 0 0 0];]]\u003e\u003c/w:t\u003e\u003c/w:r\u003e\u003c/w:p\u003e\u003cw:p\u003e\u003cw:pPr\u003e\u003cw:pStyle w:val=\\\"text\\\"/\u003e\u003c/w:pPr\u003e\u003cw:r\u003e\u003cw:t\u003eLets assume that outside the sequence there are zeros. For example:\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[                 tfs = [1 1 1 0 0 1 1 0 1 1 1 1 1 1 1];\\n  distancesFromHoles = [1 2 1 0 0 1 1 0 1 2 3 4 3 2 1];]]\u003e\u003c/w:t\u003e\u003c/w:r\u003e\u003c/w:p\u003e\u003c/w:body\u003e\u003c/w:document\u003e\"},{\"partUri\":\"/matlab/output.xml\",\"contentType\":\"text/xml\",\"content\":\"\u003c?xml version=\\\"1.0\\\" encoding=\\\"UTF-8\\\" standalone=\\\"no\\\" ?\u003e\u003cembeddedOutputs\u003e\u003cmetaData\u003e\u003cevaluationState\u003emanual\u003c/evaluationState\u003e\u003clayoutState\u003ecode\u003c/layoutState\u003e\u003coutputStatus\u003eready\u003c/outputStatus\u003e\u003c/metaData\u003e\u003coutputArray type=\\\"array\\\"/\u003e\u003cregionArray type=\\\"array\\\"/\u003e\u003c/embeddedOutputs\u003e\"}]}"},{"id":2773,"title":"Find the distance between runs","description":"Another question inspired by the \u003chttp://uk.mathworks.com/matlabcentral/answers/?s_tid=gn_mlc_an answers forum\u003e:\r\n\r\nA vector of monotonically increasing integers may contain several runs of consecutive numbers. Find out the distance between the end of runs of at least 4 consecutive numbers and the beginning of the next run of at least 4 consecutive numbers. E.g:\r\n\r\n  v = [1,2,5,6,7,8,9,20,21,22,30,31,32,33,34,35,40,41,42,43,44];\r\n\r\nhas three runs of at least 4 numbers, |[5 6 7 8 9]|, |[30,31,32,33,34,35]| and |[40,41,42,43,44]|. So,\r\n\r\n  d = [30-9, 40-35] = [21 5]\r\n  ","description_html":"\u003cp\u003eAnother question inspired by the \u003ca href = \"http://uk.mathworks.com/matlabcentral/answers/?s_tid=gn_mlc_an\"\u003eanswers forum\u003c/a\u003e:\u003c/p\u003e\u003cp\u003eA vector of monotonically increasing integers may contain several runs of consecutive numbers. Find out the distance between the end of runs of at least 4 consecutive numbers and the beginning of the next run of at least 4 consecutive numbers. E.g:\u003c/p\u003e\u003cpre class=\"language-matlab\"\u003ev = [1,2,5,6,7,8,9,20,21,22,30,31,32,33,34,35,40,41,42,43,44];\r\n\u003c/pre\u003e\u003cp\u003ehas three runs of at least 4 numbers, \u003ctt\u003e[5 6 7 8 9]\u003c/tt\u003e, \u003ctt\u003e[30,31,32,33,34,35]\u003c/tt\u003e and \u003ctt\u003e[40,41,42,43,44]\u003c/tt\u003e. So,\u003c/p\u003e\u003cpre class=\"language-matlab\"\u003ed = [30-9, 40-35] = [21 5]\r\n\u003c/pre\u003e","function_template":"function distances = rundistances(v)\r\n  distances = v;\r\nend","test_suite":"%%\r\nv = [1,2,5,6,7,8,9,20,21,22,30,31,32,33,34,35,40,41,42,43,44];\r\ndistances = [21 5];\r\nassert(isequal(rundistances(v),distances))\r\n\r\n%%\r\nv = [1:2:10, 14:20, 22, 23, 30:35, 37:39, 41:50, 52, 54:58, 60, 62];\r\ndistances = [30-20, 41-35, 54-50];\r\nassert(isequal(rundistances(v),distances))\r\n\r\n%%\r\nv = [-1 5:9 14 70:76 82];\r\ndistances = [70-9];\r\nassert(isequal(rundistances(v),distances))\r\n\r\n%%\r\nv = 1:100;\r\nassert(isempty(rundistances(v)))\r\n\r\n%%\r\nv = [1:3:100];\r\nassert(isempty(rundistances(v)))\r\n\r\n\r\n","published":true,"deleted":false,"likes_count":6,"comments_count":1,"created_by":999,"edited_by":null,"edited_at":null,"deleted_by":null,"deleted_at":null,"solvers_count":60,"test_suite_updated_at":null,"rescore_all_solutions":false,"group_id":39,"created_at":"2014-12-13T22:59:52.000Z","updated_at":"2026-04-02T08:16:55.000Z","published_at":"2014-12-13T22:59:52.000Z","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\u003eAnother question inspired by the\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://uk.mathworks.com/matlabcentral/answers/?s_tid=gn_mlc_an\\\"\u003e\u003cw:r\u003e\u003cw:t\u003eanswers forum\u003c/w:t\u003e\u003c/w:r\u003e\u003c/w:hyperlink\u003e\u003cw:r\u003e\u003cw:t\u003e:\u003c/w:t\u003e\u003c/w:r\u003e\u003c/w:p\u003e\u003cw:p\u003e\u003cw:pPr\u003e\u003cw:pStyle w:val=\\\"text\\\"/\u003e\u003c/w:pPr\u003e\u003cw:r\u003e\u003cw:t\u003eA vector of monotonically increasing integers may contain several runs of consecutive numbers. Find out the distance between the end of runs of at least 4 consecutive numbers and the beginning of the next run of at least 4 consecutive numbers. E.g:\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[v = [1,2,5,6,7,8,9,20,21,22,30,31,32,33,34,35,40,41,42,43,44];]]\u003e\u003c/w:t\u003e\u003c/w:r\u003e\u003c/w:p\u003e\u003cw:p\u003e\u003cw:pPr\u003e\u003cw:pStyle w:val=\\\"text\\\"/\u003e\u003c/w:pPr\u003e\u003cw:r\u003e\u003cw:t\u003ehas three runs of at least 4 numbers,\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:rFonts w:cs=\\\"monospace\\\"/\u003e\u003c/w:rPr\u003e\u003cw:t\u003e[5 6 7 8 9]\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:t\u003e \u003c/w:t\u003e\u003c/w:r\u003e\u003cw:r\u003e\u003cw:rPr\u003e\u003cw:rFonts w:cs=\\\"monospace\\\"/\u003e\u003c/w:rPr\u003e\u003cw:t\u003e[30,31,32,33,34,35]\u003c/w:t\u003e\u003c/w:r\u003e\u003cw:r\u003e\u003cw:t\u003e and\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:rFonts w:cs=\\\"monospace\\\"/\u003e\u003c/w:rPr\u003e\u003cw:t\u003e[40,41,42,43,44]\u003c/w:t\u003e\u003c/w:r\u003e\u003cw:r\u003e\u003cw:t\u003e. So,\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[d = [30-9, 40-35] = [21 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\"}]}"},{"id":15,"title":"Find the longest sequence of 1's in a binary sequence.","description":"Given a string such as\n\n s = '011110010000000100010111'\n\nfind the length of the longest string of consecutive 1's. In this example, the answer would be 4.\n\nExample:\n\n Input  x = '110100111'\n Output y is 3","description_html":"\u003cp\u003eGiven a string such as\u003c/p\u003e\u003cpre\u003e s = '011110010000000100010111'\u003c/pre\u003e\u003cp\u003efind the length of the longest string of consecutive 1's. In this example, the answer would be 4.\u003c/p\u003e\u003cp\u003eExample:\u003c/p\u003e\u003cpre\u003e Input  x = '110100111'\n Output y is 3\u003c/pre\u003e","function_template":"function y = lengthOnes(x)\n  y = x\nend","test_suite":"%%\nx = '0';\ny_correct = 0;\nassert(isequal(lengthOnes(x),y_correct))\n\n%%\nx = '1';\ny_correct = 1;\nassert(isequal(lengthOnes(x),y_correct))\n\n%%\nx = '01';\ny_correct = 1;\nassert(isequal(lengthOnes(x),y_correct))\n\n%%\nx = '10';\ny_correct = 1;\nassert(isequal(lengthOnes(x),y_correct))\n\n%%\nx = '00';\ny_correct = 0;\nassert(isequal(lengthOnes(x),y_correct))\n\n%%\nx = '11';\n y_correct = 2;\nassert(isequal(lengthOnes(x),y_correct))\n%%\nx = '1111111111';\ny_correct = 10;\nassert(isequal(lengthOnes(x),y_correct))\n\n%%\nx = '100101011111010011111';\ny_correct = 5;\nassert(isequal(lengthOnes(x),y_correct))\n\n%%\nx = '01010101010101010101010101';\ny_correct = 1;\nassert(isequal(lengthOnes(x),y_correct))\n\n%%\nx = '0101010111000101110001011100010100001110110100000000110001001000001110001000111010101001101100001111';\ny_correct = 4;\nassert(isequal(lengthOnes(x),y_correct))","published":true,"deleted":false,"likes_count":81,"comments_count":10,"created_by":1,"edited_by":null,"edited_at":null,"deleted_by":null,"deleted_at":null,"solvers_count":6696,"test_suite_updated_at":"2012-01-18T01:00:19.000Z","rescore_all_solutions":false,"group_id":2,"created_at":"2012-01-18T01:00:19.000Z","updated_at":"2026-04-03T20:38:16.000Z","published_at":"2012-01-18T01:00:19.000Z","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 string such as\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[ s = '011110010000000100010111']]\u003e\u003c/w:t\u003e\u003c/w:r\u003e\u003c/w:p\u003e\u003cw:p\u003e\u003cw:pPr\u003e\u003cw:pStyle w:val=\\\"text\\\"/\u003e\u003c/w:pPr\u003e\u003cw:r\u003e\u003cw:t\u003efind the length of the longest string of consecutive 1's. In this example, the answer would be 4.\u003c/w:t\u003e\u003c/w:r\u003e\u003c/w:p\u003e\u003cw:p\u003e\u003cw:pPr\u003e\u003cw:pStyle w:val=\\\"text\\\"/\u003e\u003c/w:pPr\u003e\u003cw:r\u003e\u003cw:t\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[ Input  x = '110100111'\\n Output y is 3]]\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":2223,"title":"Cumulative difference","description":"Given an array, return the cumulative difference.\r\n\r\nExample\r\n\r\n a = [ 1 3 5 7 ]\r\n cumdiff = [ 1 2 1 -2 ]\r\n\r\n","description_html":"\u003cp\u003eGiven an array, return the cumulative difference.\u003c/p\u003e\u003cp\u003eExample\u003c/p\u003e\u003cpre\u003e a = [ 1 3 5 7 ]\r\n cumdiff = [ 1 2 1 -2 ]\u003c/pre\u003e","function_template":"function y = CumDiff(x)\r\n  y = x;\r\nend","test_suite":"%%\r\nx = [1 3 5 7];\r\ny_correct = [1 2 1 -2];\r\nassert(isequal(CumDiff(x),y_correct))\r\n\r\n%%\r\nx = [23 3 15 16];\r\ny_correct = [23 -20 -11 -25];\r\nassert(isequal(CumDiff(x),y_correct))\r\n\r\n%%\r\nx = [5];\r\ny_correct = [5];\r\nassert(isequal(CumDiff(x),y_correct))\r\n\r\n%%\r\nx = 43:49;\r\ny_correct = [ 43   1   -42   -86    -131   -177   -224];\r\nassert(isequal(CumDiff(x),y_correct))\r\n\r\n%%\r\nx = zeros(0,1);\r\ny_correct = zeros(0,1)\r\nassert(isequal(CumDiff(x),y_correct))\r\n\r\n%%\r\nx = [1 10 100 1000 10000];\r\ny_correct = [1 9 89 889 8889];\r\nassert(isequal(CumDiff(x),y_correct))\r\n","published":true,"deleted":false,"likes_count":1,"comments_count":0,"created_by":16381,"edited_by":null,"edited_at":null,"deleted_by":null,"deleted_at":null,"solvers_count":74,"test_suite_updated_at":"2014-02-26T21:46:35.000Z","rescore_all_solutions":false,"group_id":1,"created_at":"2014-02-26T21:25:13.000Z","updated_at":"2026-03-31T12:46:07.000Z","published_at":"2014-02-26T21:40:51.000Z","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 an array, return the cumulative difference.\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[ a = [ 1 3 5 7 ]\\n cumdiff = [ 1 2 1 -2 ]]]\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":1554,"title":"Calculate the derivative of a polynomial","description":"Example:\r\n in = [ 1\r\n        1\r\n        1 ]\r\n\r\n out = [ 2\r\n         1 ]","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: 153.6px; display: block; min-width: 0px; padding-block-start: 0px; padding-top: 0px; perspective-origin: 407px 76.8px; transform-origin: 407px 76.8px; vertical-align: baseline; \"\u003e\u003cdiv style=\"block-size: 21px; 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: 28.5px 8px; transform-origin: 28.5px 8px; unicode-bidi: normal; \"\u003e\u003cspan style=\"\"\u003eExample:\u003c/span\u003e\u003c/span\u003e\u003c/div\u003e\u003cdiv style=\"background-color: rgb(247, 247, 247); block-size: 122.6px; border-bottom-left-radius: 4px; border-bottom-right-radius: 4px; border-end-end-radius: 4px; border-end-start-radius: 4px; border-start-end-radius: 4px; border-start-start-radius: 4px; border-top-left-radius: 4px; border-top-right-radius: 4px; margin-block-end: 10px; margin-block-start: 10px; margin-bottom: 10px; margin-inline-end: 3px; margin-inline-start: 3px; margin-left: 3px; margin-right: 3px; margin-top: 10px; perspective-origin: 404px 61.3px; transform-origin: 404px 61.3px; margin-left: 3px; margin-top: 10px; margin-bottom: 10px; margin-right: 3px; \"\u003e\u003cdiv style=\"background-color: rgba(0, 0, 0, 0); block-size: 20.4333px; border-bottom-left-radius: 0px; border-bottom-right-radius: 0px; border-end-end-radius: 0px; border-end-start-radius: 0px; border-inline-end-color: rgb(233, 233, 233); border-inline-end-style: solid; border-inline-end-width: 1px; border-inline-start-color: rgb(233, 233, 233); border-inline-start-style: solid; border-inline-start-width: 1px; border-left-color: rgb(233, 233, 233); border-left-style: solid; border-left-width: 1px; border-right-color: rgb(233, 233, 233); border-right-style: solid; border-right-width: 1px; border-start-end-radius: 0px; border-start-start-radius: 0px; border-top-left-radius: 0px; border-top-right-radius: 0px; 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; min-block-size: 18px; min-height: 18px; padding-inline-start: 4px; padding-left: 4px; perspective-origin: 404px 10.2167px; transform-origin: 404px 10.2167px; white-space: nowrap; 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border-end-start-radius: 0px; border-inline-end-color: rgb(233, 233, 233); border-inline-end-style: solid; border-inline-end-width: 1px; border-inline-start-color: rgb(233, 233, 233); border-inline-start-style: solid; border-inline-start-width: 1px; border-left-color: rgb(233, 233, 233); border-left-style: solid; border-left-width: 1px; border-right-color: rgb(233, 233, 233); border-right-style: solid; border-right-width: 1px; border-start-end-radius: 0px; border-start-start-radius: 0px; border-top-left-radius: 0px; border-top-right-radius: 0px; 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; min-block-size: 18px; min-height: 18px; padding-inline-start: 4px; padding-left: 4px; perspective-origin: 404px 10.2167px; transform-origin: 404px 10.2167px; white-space: nowrap; \"\u003e\u003cspan style=\"block-size: auto; border-inline-end-color: rgb(0, 0, 0); border-inline-end-style: none; 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% since diff(1, 2) \u003c= 1 and diff(7, 8) \u003c= 1\r\n","description_html":"\u003cp\u003eBased on a question on \u003ca href = \"http://www.mathworks.com/matlabcentral/answers/\"\u003eMATLAB Answers\u003c/a\u003e.\u003c/p\u003e\u003cp\u003eFind all the elements of a vector whose difference, regardless of position is less or equal than a given range.\u003c/p\u003e\u003cp\u003eExample\u003c/p\u003e\u003cpre\u003e A = [1 4 7 10 2 8];\r\n range = 1;\r\n inrange = [1 0 1 0 1 1]; % since diff(1, 2) \u0026lt;= 1 and diff(7, 8) \u0026lt;= 1\u003c/pre\u003e","function_template":"function tf = isinrange(A, range)\r\n  false;\r\nend\r\n","test_suite":"%%\r\nA = [1 4 7 10 2 8];\r\nrange = 1;\r\ninrange = [1 0 1 0 1 1];\r\nassert(isequal(isinrange(A, range),inrange))\r\n\r\n%%\r\nA = [10 15 18 12 3 7 2];\r\nrange = 2;\r\ninrange = [1 0 0 1 1 0 1];\r\nassert(isequal(isinrange(A, range),inrange))\r\n\r\n\r\n%%\r\nA = [10 15 18 12 4 7 2];\r\nrange = 3;\r\ninrange = [1 1 1 1 1 1 1];\r\nassert(isequal(isinrange(A, range),inrange))\r\n\r\n%%\r\nA = [10 15 18 12 4 7 2];\r\nrange = 1;\r\ninrange = [0 0 0 0 0 0 0];\r\nassert(isequal(isinrange(A, range),inrange))\r\n","published":true,"deleted":false,"likes_count":2,"comments_count":1,"created_by":999,"edited_by":null,"edited_at":null,"deleted_by":null,"deleted_at":null,"solvers_count":74,"test_suite_updated_at":null,"rescore_all_solutions":false,"group_id":39,"created_at":"2014-09-15T19:10:47.000Z","updated_at":"2026-04-02T08:15:03.000Z","published_at":"2014-09-15T19:10:47.000Z","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\u003eBased on a question on\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/matlabcentral/answers/\\\"\u003e\u003cw:r\u003e\u003cw:t\u003eMATLAB Answers\u003c/w:t\u003e\u003c/w:r\u003e\u003c/w:hyperlink\u003e\u003cw:r\u003e\u003cw:t\u003e.\u003c/w:t\u003e\u003c/w:r\u003e\u003c/w:p\u003e\u003cw:p\u003e\u003cw:pPr\u003e\u003cw:pStyle w:val=\\\"text\\\"/\u003e\u003c/w:pPr\u003e\u003cw:r\u003e\u003cw:t\u003eFind all the elements of a vector whose difference, regardless of position is less or equal than a given range.\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[ A = [1 4 7 10 2 8];\\n range = 1;\\n inrange = [1 0 1 0 1 1]; 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You want to know your distance from a bad place (in the sense of your location in the array/vector). For example:\r\n\r\n  tfs = [0 0 0 1 1 1 1 1 0 0 0 1 1 1 0 0 0];\r\n\r\nFor this scenario, we want to have:\r\n\r\n  distancesFromHoles = [0 0 0 1 2 3 2 1 0 0 0 1 2 1 0 0 0];\r\n\r\nLets assume that outside the sequence there are zeros. For example:\r\n\r\n                 tfs = [1 1 1 0 0 1 1 0 1 1 1 1 1 1 1];\r\n  distancesFromHoles = [1 2 1 0 0 1 1 0 1 2 3 4 3 2 1];\r\n","description_html":"\u003cp\u003eSuppose you have a description of good places (ones) and bad places (zeros). You want to know your distance from a bad place (in the sense of your location in the array/vector). For example:\u003c/p\u003e\u003cpre class=\"language-matlab\"\u003etfs = [0 0 0 1 1 1 1 1 0 0 0 1 1 1 0 0 0];\r\n\u003c/pre\u003e\u003cp\u003eFor this scenario, we want to have:\u003c/p\u003e\u003cpre class=\"language-matlab\"\u003edistancesFromHoles = [0 0 0 1 2 3 2 1 0 0 0 1 2 1 0 0 0];\r\n\u003c/pre\u003e\u003cp\u003eLets assume that outside the sequence there are zeros. For example:\u003c/p\u003e\u003cpre\u003e                 tfs = [1 1 1 0 0 1 1 0 1 1 1 1 1 1 1];\r\n  distancesFromHoles = [1 2 1 0 0 1 1 0 1 2 3 4 3 2 1];\u003c/pre\u003e","function_template":"function y = distancesFromHoles(x)\r\n  d = diff([0 v]);\r\nend","test_suite":"%%\r\n        x = [0 0 1 1 1 0];\r\ny_correct = [0 0 1 2 1 0];\r\nassert(isequal(distancesFromHoles(x),y_correct))\r\n\r\n%%\r\n        x = [1 1 1 0 0 1 1 0 1 1 1 1 1 1 1];\r\ny_correct = [1 2 1 0 0 1 1 0 1 2 3 4 3 2 1];\r\nassert(isequal(distancesFromHoles(x),y_correct))\r\n\r\n%%\r\nx = [ones(1,10),0,ones(1,10)];\r\ny_correct = [1:5,5:-1:0,1:5,5:-1:1];\r\nassert(isequal(distancesFromHoles(x),y_correct))\r\n\r\n%%\r\n        x = [1 1 1 0 0 0 0 0 0 0 0 0 1 1 1];\r\ny_correct = [1 2 1 0 0 0 0 0 0 0 0 0 1 2 1];\r\nassert(isequal(distancesFromHoles(x),y_correct))\r\n\r\n%%\r\nx = ones(1,101);\r\ny_correct = [1:51,50:-1:1];\r\nassert(isequal(distancesFromHoles(x),y_correct))\r\n\r\n%%\r\nx = [repmat([1,0],[1,50]),1];\r\ny_correct = x;\r\nassert(isequal(distancesFromHoles(x),y_correct))","published":true,"deleted":false,"likes_count":2,"comments_count":1,"created_by":44119,"edited_by":null,"edited_at":null,"deleted_by":null,"deleted_at":null,"solvers_count":58,"test_suite_updated_at":"2018-03-03T19:22:09.000Z","rescore_all_solutions":false,"group_id":39,"created_at":"2015-05-17T08:00:09.000Z","updated_at":"2026-04-02T08:20:08.000Z","published_at":"2015-05-17T08:01:59.000Z","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\u003eSuppose you have a description of good places (ones) and bad places (zeros). You want to know your distance from a bad place (in the sense of your location in the array/vector). For example:\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[tfs = [0 0 0 1 1 1 1 1 0 0 0 1 1 1 0 0 0];]]\u003e\u003c/w:t\u003e\u003c/w:r\u003e\u003c/w:p\u003e\u003cw:p\u003e\u003cw:pPr\u003e\u003cw:pStyle w:val=\\\"text\\\"/\u003e\u003c/w:pPr\u003e\u003cw:r\u003e\u003cw:t\u003eFor this scenario, we want to have:\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[distancesFromHoles = [0 0 0 1 2 3 2 1 0 0 0 1 2 1 0 0 0];]]\u003e\u003c/w:t\u003e\u003c/w:r\u003e\u003c/w:p\u003e\u003cw:p\u003e\u003cw:pPr\u003e\u003cw:pStyle w:val=\\\"text\\\"/\u003e\u003c/w:pPr\u003e\u003cw:r\u003e\u003cw:t\u003eLets assume that outside the sequence there are zeros. For example:\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[                 tfs = [1 1 1 0 0 1 1 0 1 1 1 1 1 1 1];\\n  distancesFromHoles = [1 2 1 0 0 1 1 0 1 2 3 4 3 2 1];]]\u003e\u003c/w:t\u003e\u003c/w:r\u003e\u003c/w:p\u003e\u003c/w:body\u003e\u003c/w:document\u003e\"},{\"partUri\":\"/matlab/output.xml\",\"contentType\":\"text/xml\",\"content\":\"\u003c?xml version=\\\"1.0\\\" encoding=\\\"UTF-8\\\" standalone=\\\"no\\\" ?\u003e\u003cembeddedOutputs\u003e\u003cmetaData\u003e\u003cevaluationState\u003emanual\u003c/evaluationState\u003e\u003clayoutState\u003ecode\u003c/layoutState\u003e\u003coutputStatus\u003eready\u003c/outputStatus\u003e\u003c/metaData\u003e\u003coutputArray type=\\\"array\\\"/\u003e\u003cregionArray type=\\\"array\\\"/\u003e\u003c/embeddedOutputs\u003e\"}]}"},{"id":2773,"title":"Find the distance between runs","description":"Another question inspired by the \u003chttp://uk.mathworks.com/matlabcentral/answers/?s_tid=gn_mlc_an answers forum\u003e:\r\n\r\nA vector of monotonically increasing integers may contain several runs of consecutive numbers. Find out the distance between the end of runs of at least 4 consecutive numbers and the beginning of the next run of at least 4 consecutive numbers. E.g:\r\n\r\n  v = [1,2,5,6,7,8,9,20,21,22,30,31,32,33,34,35,40,41,42,43,44];\r\n\r\nhas three runs of at least 4 numbers, |[5 6 7 8 9]|, |[30,31,32,33,34,35]| and |[40,41,42,43,44]|. So,\r\n\r\n  d = [30-9, 40-35] = [21 5]\r\n  ","description_html":"\u003cp\u003eAnother question inspired by the \u003ca href = \"http://uk.mathworks.com/matlabcentral/answers/?s_tid=gn_mlc_an\"\u003eanswers forum\u003c/a\u003e:\u003c/p\u003e\u003cp\u003eA vector of monotonically increasing integers may contain several runs of consecutive numbers. Find out the distance between the end of runs of at least 4 consecutive numbers and the beginning of the next run of at least 4 consecutive numbers. E.g:\u003c/p\u003e\u003cpre class=\"language-matlab\"\u003ev = [1,2,5,6,7,8,9,20,21,22,30,31,32,33,34,35,40,41,42,43,44];\r\n\u003c/pre\u003e\u003cp\u003ehas three runs of at least 4 numbers, \u003ctt\u003e[5 6 7 8 9]\u003c/tt\u003e, \u003ctt\u003e[30,31,32,33,34,35]\u003c/tt\u003e and \u003ctt\u003e[40,41,42,43,44]\u003c/tt\u003e. So,\u003c/p\u003e\u003cpre class=\"language-matlab\"\u003ed = [30-9, 40-35] = [21 5]\r\n\u003c/pre\u003e","function_template":"function distances = rundistances(v)\r\n  distances = v;\r\nend","test_suite":"%%\r\nv = [1,2,5,6,7,8,9,20,21,22,30,31,32,33,34,35,40,41,42,43,44];\r\ndistances = [21 5];\r\nassert(isequal(rundistances(v),distances))\r\n\r\n%%\r\nv = [1:2:10, 14:20, 22, 23, 30:35, 37:39, 41:50, 52, 54:58, 60, 62];\r\ndistances = [30-20, 41-35, 54-50];\r\nassert(isequal(rundistances(v),distances))\r\n\r\n%%\r\nv = [-1 5:9 14 70:76 82];\r\ndistances = [70-9];\r\nassert(isequal(rundistances(v),distances))\r\n\r\n%%\r\nv = 1:100;\r\nassert(isempty(rundistances(v)))\r\n\r\n%%\r\nv = [1:3:100];\r\nassert(isempty(rundistances(v)))\r\n\r\n\r\n","published":true,"deleted":false,"likes_count":6,"comments_count":1,"created_by":999,"edited_by":null,"edited_at":null,"deleted_by":null,"deleted_at":null,"solvers_count":60,"test_suite_updated_at":null,"rescore_all_solutions":false,"group_id":39,"created_at":"2014-12-13T22:59:52.000Z","updated_at":"2026-04-02T08:16:55.000Z","published_at":"2014-12-13T22:59:52.000Z","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\u003eAnother question inspired by the\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://uk.mathworks.com/matlabcentral/answers/?s_tid=gn_mlc_an\\\"\u003e\u003cw:r\u003e\u003cw:t\u003eanswers forum\u003c/w:t\u003e\u003c/w:r\u003e\u003c/w:hyperlink\u003e\u003cw:r\u003e\u003cw:t\u003e:\u003c/w:t\u003e\u003c/w:r\u003e\u003c/w:p\u003e\u003cw:p\u003e\u003cw:pPr\u003e\u003cw:pStyle w:val=\\\"text\\\"/\u003e\u003c/w:pPr\u003e\u003cw:r\u003e\u003cw:t\u003eA vector of monotonically increasing integers may contain several runs of consecutive numbers. Find out the distance between the end of runs of at least 4 consecutive numbers and the beginning of the next run of at least 4 consecutive numbers. E.g:\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[v = [1,2,5,6,7,8,9,20,21,22,30,31,32,33,34,35,40,41,42,43,44];]]\u003e\u003c/w:t\u003e\u003c/w:r\u003e\u003c/w:p\u003e\u003cw:p\u003e\u003cw:pPr\u003e\u003cw:pStyle w:val=\\\"text\\\"/\u003e\u003c/w:pPr\u003e\u003cw:r\u003e\u003cw:t\u003ehas three runs of at least 4 numbers,\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:rFonts w:cs=\\\"monospace\\\"/\u003e\u003c/w:rPr\u003e\u003cw:t\u003e[5 6 7 8 9]\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:t\u003e \u003c/w:t\u003e\u003c/w:r\u003e\u003cw:r\u003e\u003cw:rPr\u003e\u003cw:rFonts w:cs=\\\"monospace\\\"/\u003e\u003c/w:rPr\u003e\u003cw:t\u003e[30,31,32,33,34,35]\u003c/w:t\u003e\u003c/w:r\u003e\u003cw:r\u003e\u003cw:t\u003e and\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:rFonts w:cs=\\\"monospace\\\"/\u003e\u003c/w:rPr\u003e\u003cw:t\u003e[40,41,42,43,44]\u003c/w:t\u003e\u003c/w:r\u003e\u003cw:r\u003e\u003cw:t\u003e. So,\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[d = [30-9, 40-35] = [21 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\"}]}"},{"id":15,"title":"Find the longest sequence of 1's in a binary sequence.","description":"Given a string such as\n\n s = '011110010000000100010111'\n\nfind the length of the longest string of consecutive 1's. In this example, the answer would be 4.\n\nExample:\n\n Input  x = '110100111'\n Output y is 3","description_html":"\u003cp\u003eGiven a string such as\u003c/p\u003e\u003cpre\u003e s = '011110010000000100010111'\u003c/pre\u003e\u003cp\u003efind the length of the longest string of consecutive 1's. In this example, the answer would be 4.\u003c/p\u003e\u003cp\u003eExample:\u003c/p\u003e\u003cpre\u003e Input  x = '110100111'\n Output y is 3\u003c/pre\u003e","function_template":"function y = lengthOnes(x)\n  y = x\nend","test_suite":"%%\nx = '0';\ny_correct = 0;\nassert(isequal(lengthOnes(x),y_correct))\n\n%%\nx = '1';\ny_correct = 1;\nassert(isequal(lengthOnes(x),y_correct))\n\n%%\nx = '01';\ny_correct = 1;\nassert(isequal(lengthOnes(x),y_correct))\n\n%%\nx = '10';\ny_correct = 1;\nassert(isequal(lengthOnes(x),y_correct))\n\n%%\nx = '00';\ny_correct = 0;\nassert(isequal(lengthOnes(x),y_correct))\n\n%%\nx = '11';\n y_correct = 2;\nassert(isequal(lengthOnes(x),y_correct))\n%%\nx = '1111111111';\ny_correct = 10;\nassert(isequal(lengthOnes(x),y_correct))\n\n%%\nx = '100101011111010011111';\ny_correct = 5;\nassert(isequal(lengthOnes(x),y_correct))\n\n%%\nx = '01010101010101010101010101';\ny_correct = 1;\nassert(isequal(lengthOnes(x),y_correct))\n\n%%\nx = '0101010111000101110001011100010100001110110100000000110001001000001110001000111010101001101100001111';\ny_correct = 4;\nassert(isequal(lengthOnes(x),y_correct))","published":true,"deleted":false,"likes_count":81,"comments_count":10,"created_by":1,"edited_by":null,"edited_at":null,"deleted_by":null,"deleted_at":null,"solvers_count":6696,"test_suite_updated_at":"2012-01-18T01:00:19.000Z","rescore_all_solutions":false,"group_id":2,"created_at":"2012-01-18T01:00:19.000Z","updated_at":"2026-04-03T20:38:16.000Z","published_at":"2012-01-18T01:00:19.000Z","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 string such as\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[ s = '011110010000000100010111']]\u003e\u003c/w:t\u003e\u003c/w:r\u003e\u003c/w:p\u003e\u003cw:p\u003e\u003cw:pPr\u003e\u003cw:pStyle w:val=\\\"text\\\"/\u003e\u003c/w:pPr\u003e\u003cw:r\u003e\u003cw:t\u003efind the length of the longest string of consecutive 1's. In this example, the answer would be 4.\u003c/w:t\u003e\u003c/w:r\u003e\u003c/w:p\u003e\u003cw:p\u003e\u003cw:pPr\u003e\u003cw:pStyle w:val=\\\"text\\\"/\u003e\u003c/w:pPr\u003e\u003cw:r\u003e\u003cw:t\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[ Input  x = '110100111'\\n Output y is 3]]\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\"}]}"}],"term":"tag:\"diff\"","current_player_id":null,"fields":[{"name":"page","type":"integer","callback":null,"default":1,"directive":null,"facet":null,"facet_method":"and","operator":null,"param":null,"static":null,"prepend":true},{"name":"per_page","type":"integer","callback":null,"default":50,"directive":null,"facet":null,"facet_method":"and","operator":null,"param":null,"static":null,"prepend":true},{"name":"sort","type":"string","callback":null,"default":null,"directive":null,"facet":null,"facet_method":"and","operator":null,"param":null,"static":null,"prepend":true},{"name":"body","type":"text","callback":null,"default":"*:*","directive":null,"facet":null,"facet_method":"and","operator":null,"param":"term","static":null,"prepend":false},{"name":"group","type":"string","callback":null,"default":null,"directive":"group","facet":true,"facet_method":"and","operator":null,"param":"term","static":null,"prepend":true},{"name":"difficulty_rating_bin","type":"string","callback":null,"default":null,"directive":"difficulty_rating_bin","facet":true,"facet_method":"and","operator":null,"param":"term","static":null,"prepend":true},{"name":"id","type":"integer","callback":null,"default":null,"directive":"id","facet":null,"facet_method":"and","operator":null,"param":"term","static":null,"prepend":true},{"name":"tag","type":"string","callback":null,"default":null,"directive":"tag","facet":null,"facet_method":"and","operator":null,"param":"term","static":null,"prepend":true},{"name":"product","type":"string","callback":null,"default":null,"directive":"product","facet":null,"facet_method":"and","operator":null,"param":"term","static":null,"prepend":true},{"name":"created_at","type":"timeframe","callback":{},"default":null,"directive":"created_at","facet":null,"facet_method":"and","operator":null,"param":"term","static":null,"prepend":true},{"name":"profile_id","type":"integer","callback":null,"default":null,"directive":"author_id","facet":null,"facet_method":"and","operator":null,"param":"term","static":null,"prepend":true},{"name":"created_by","type":"string","callback":null,"default":null,"directive":"author","facet":null,"facet_method":"and","operator":null,"param":"term","static":null,"prepend":true},{"name":"player_id","type":"integer","callback":null,"default":null,"directive":"solver_id","facet":null,"facet_method":"and","operator":null,"param":"term","static":null,"prepend":true},{"name":"player","type":"string","callback":null,"default":null,"directive":"solver","facet":null,"facet_method":"and","operator":null,"param":"term","static":null,"prepend":true},{"name":"solvers_count","type":"integer","callback":null,"default":null,"directive":"solvers_count","facet":null,"facet_method":"and","operator":null,"param":"term","static":null,"prepend":true},{"name":"comments_count","type":"integer","callback":null,"default":null,"directive":"comments_count","facet":null,"facet_method":"and","operator":null,"param":"term","static":null,"prepend":true},{"name":"likes_count","type":"integer","callback":null,"default":null,"directive":"likes_count","facet":null,"facet_method":"and","operator":null,"param":"term","static":null,"prepend":true},{"name":"leader_id","type":"integer","callback":null,"default":null,"directive":"leader_id","facet":null,"facet_method":"and","operator":null,"param":"term","static":null,"prepend":true},{"name":"leading_solution","type":"integer","callback":null,"default":null,"directive":"leading_solution","facet":null,"facet_method":"and","operator":null,"param":"term","static":null,"prepend":true}],"filters":[{"name":"asset_type","type":"string","callback":null,"default":null,"directive":null,"facet":null,"facet_method":"and","operator":null,"param":null,"static":"\"cody:problem\"","prepend":true},{"name":"profile_id","type":"integer","callback":{},"default":null,"directive":null,"facet":null,"facet_method":"and","operator":null,"param":"author_id","static":null,"prepend":true}],"query":{"params":{"per_page":50,"term":"tag:\"diff\"","current_player":null,"sort":"map(difficulty_value,0,0,999) 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