{"group":{"id":1,"name":"Community","lockable":false,"created_at":"2012-01-18T18:02:15.000Z","updated_at":"2026-04-16T00:12:35.000Z","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":"2026-04-16T00:00:00.000Z","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":2953,"title":"Split array into pieces according to corresponding array","description":"An array x of length n has values 1...m with each value appearing at least once. The values are sorted (n\u003e=m).\r\n\r\n  \r\n\r\nA second array y of the same size should be split into elements of a cell array c such that the first element of c contains all elements of y at the positions where x=1 and so on: \r\n\r\n  x=   [ 1  1  1  2  2  3  3  3  3];\r\n  y=   [10 52 12 58 21 43 89 27 98];\r\n  c{1}=[10 52 12];\r\n  c{2}=[         58 21];\r\n  c{3}=[               43 89 27 98];","description_html":"\u003cp\u003eAn array x of length n has values 1...m with each value appearing at least once. The values are sorted (n\u0026gt;=m).\u003c/p\u003e\u003cp\u003eA second array y of the same size should be split into elements of a cell array c such that the first element of c contains all elements of y at the positions where x=1 and so on:\u003c/p\u003e\u003cpre class=\"language-matlab\"\u003ex=   [ 1  1  1  2  2  3  3  3  3];\r\ny=   [10 52 12 58 21 43 89 27 98];\r\nc{1}=[10 52 12];\r\nc{2}=[         58 21];\r\nc{3}=[               43 89 27 98];\r\n\u003c/pre\u003e","function_template":"function c = split_array(x,y)\r\n  \r\nend","test_suite":"%%\r\nx=[ 1  1  1  2  2  3  3  3  3];\r\ny=[10 52 12 58 21 43 89 27 98];\r\nc={[10 52 12],[58 21],[43 89 27 98]};\r\nassert(isequal(split_array(x,y),c))\r\n\r\n%%\r\nx=1:5;\r\nc=num2cell(1:5);\r\nassert(isequal(split_array(x,x),c));\r\n\r\n%%\r\nx=[1 1 1 1 1 2 3 3 3 3 3];\r\ny='Hello world';\r\nc={'Hello' ' ' 'world'}\r\nassert(isequal(split_array(x,y),c));\r\n","published":true,"deleted":false,"likes_count":1,"comments_count":0,"created_by":971,"edited_by":null,"edited_at":null,"deleted_by":null,"deleted_at":null,"solvers_count":60,"test_suite_updated_at":"2015-02-05T18:04:21.000Z","rescore_all_solutions":false,"group_id":39,"created_at":"2015-02-05T18:02:26.000Z","updated_at":"2026-04-02T08:17:58.000Z","published_at":"2015-02-05T18:04:21.000Z","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\u003eAn array x of length n has values 1...m with each value appearing at least once. The values are sorted (n\u0026gt;=m).\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 second array y of the same size should be split into elements of a cell array c such that the first element of c contains all elements of y at the positions where x=1 and so on:\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  1  1  2  2  3  3  3  3];\\ny=   [10 52 12 58 21 43 89 27 98];\\nc{1}=[10 52 12];\\nc{2}=[         58 21];\\nc{3}=[               43 89 27 98];]]\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":2073,"title":"Split a given string from the first instance of a given character","description":"A simple operation to split a given string into two substrings at the point where the desired character is first found. e.g. \r\n\r\ninputString: 'we have 6 cars'  split it from '6'\r\n\r\noutput: 'we have ' and '6 cars'\r\n\r\nIf the desired character is not found then first substring is same as the whole string and the second string is empty string, i.e. y2='';","description_html":"\u003cp\u003eA simple operation to split a given string into two substrings at the point where the desired character is first found. e.g.\u003c/p\u003e\u003cp\u003einputString: 'we have 6 cars'  split it from '6'\u003c/p\u003e\u003cp\u003eoutput: 'we have ' and '6 cars'\u003c/p\u003e\u003cp\u003eIf the desired character is not found then first substring is same as the whole string and the second string is empty string, i.e. y2='';\u003c/p\u003e","function_template":"function [y1,y2] = SplitString(x,divider)\r\n  y1=0;\r\n  y2=0;\r\nend\r\n\r\n","test_suite":"%%\r\nx='I want to split this: from this';\r\n[y1,y2] = SplitString(x,':');\r\n\r\ny1_correct = 'I want to split this';\r\ny2_correct = ': from this';\r\n\r\nassert(isequal(y1,y1_correct))\r\nassert(isequal(y2,y2_correct))\r\n\r\n%%\r\nx='This one does not have the divider';\r\n[y1,y2] = SplitString(x,':')\r\n\r\ny1_correct = 'This one does not have the divider'\r\ny2_correct = ''\r\n\r\nassert(isequal(y1,y1_correct))\r\nassert(isequal(y2,y2_correct))\r\n\r\n%%\r\nx='This sentence should, not have a comma.';\r\n[y1,y2] = SplitString(x,',')\r\n\r\ny1_correct = 'This sentence should'\r\ny2_correct = ', not have a comma.'\r\n\r\nassert(isequal(y1,y1_correct))\r\nassert(isequal(y2,y2_correct))\r\n\r\n%%\r\nx='Divide only @ at the @ first instance of @.';\r\n[y1,y2] = SplitString(x,'@')\r\n\r\ny1_correct = 'Divide only '\r\ny2_correct = '@ at the @ first instance of @.'\r\n\r\nassert(isequal(y1,y1_correct))\r\nassert(isequal(y2,y2_correct))\r\n\r\n%%\r\nx='Take that, and this, and something else.';\r\n[y1,y2] = SplitString(x,',')\r\n\r\ny1_correct = 'Take that'\r\ny2_correct = ', and this, and something else.'\r\n\r\nassert(isequal(y1,y1_correct))\r\nassert(isequal(y2,y2_correct))\r\n","published":true,"deleted":false,"likes_count":2,"comments_count":3,"created_by":21274,"edited_by":null,"edited_at":null,"deleted_by":null,"deleted_at":null,"solvers_count":125,"test_suite_updated_at":"2017-05-31T17:36:57.000Z","rescore_all_solutions":false,"group_id":28,"created_at":"2013-12-24T17:05:02.000Z","updated_at":"2026-04-16T19:40:16.000Z","published_at":"2013-12-24T17:32:55.000Z","restored_at":null,"restored_by":null,"spam":false,"simulink":false,"admin_reviewed":false,"description_opc":"{\"relationships\":[{\"relationshipType\":\"http://schemas.mathworks.com/matlab/code/2013/relationships/document\",\"relationshipId\":\"rId1\",\"target\":\"/matlab/document.xml\"},{\"relationshipType\":\"http://schemas.mathworks.com/matlab/code/2013/relationships/output\",\"relationshipId\":\"rId2\",\"target\":\"/matlab/output.xml\"}],\"parts\":[{\"partUri\":\"/matlab/document.xml\",\"relationship\":[],\"contentType\":\"application/vnd.mathworks.matlab.code.document+xml\",\"content\":\"\u003c?xml version=\\\"1.0\\\" encoding=\\\"UTF-8\\\"?\u003e\u003cw:document xmlns:w=\\\"http://schemas.openxmlformats.org/wordprocessingml/2006/main\\\"\u003e\u003cw:body\u003e\u003cw:p\u003e\u003cw:pPr\u003e\u003cw:pStyle w:val=\\\"text\\\"/\u003e\u003c/w:pPr\u003e\u003cw:r\u003e\u003cw:t\u003eA simple operation to split a given string into two substrings at the point where the desired character is first found. e.g.\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\u003einputString: 'we have 6 cars' split it from '6'\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\u003eoutput: 'we have ' and '6 cars'\u003c/w:t\u003e\u003c/w:r\u003e\u003c/w:p\u003e\u003cw:p\u003e\u003cw:pPr\u003e\u003cw:pStyle 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array x of length n has values 1...m with each value appearing at least once. The values are sorted (n\u003e=m).\r\n\r\n  \r\n\r\nA second array y of the same size should be split into elements of a cell array c such that the first element of c contains all elements of y at the positions where x=1 and so on: \r\n\r\n  x=   [ 1  1  1  2  2  3  3  3  3];\r\n  y=   [10 52 12 58 21 43 89 27 98];\r\n  c{1}=[10 52 12];\r\n  c{2}=[         58 21];\r\n  c{3}=[               43 89 27 98];","description_html":"\u003cp\u003eAn array x of length n has values 1...m with each value appearing at least once. The values are sorted (n\u0026gt;=m).\u003c/p\u003e\u003cp\u003eA second array y of the same size should be split into elements of a cell array c such that the first element of c contains all elements of y at the positions where x=1 and so on:\u003c/p\u003e\u003cpre class=\"language-matlab\"\u003ex=   [ 1  1  1  2  2  3  3  3  3];\r\ny=   [10 52 12 58 21 43 89 27 98];\r\nc{1}=[10 52 12];\r\nc{2}=[         58 21];\r\nc{3}=[               43 89 27 98];\r\n\u003c/pre\u003e","function_template":"function c = split_array(x,y)\r\n  \r\nend","test_suite":"%%\r\nx=[ 1  1  1  2  2  3  3  3  3];\r\ny=[10 52 12 58 21 43 89 27 98];\r\nc={[10 52 12],[58 21],[43 89 27 98]};\r\nassert(isequal(split_array(x,y),c))\r\n\r\n%%\r\nx=1:5;\r\nc=num2cell(1:5);\r\nassert(isequal(split_array(x,x),c));\r\n\r\n%%\r\nx=[1 1 1 1 1 2 3 3 3 3 3];\r\ny='Hello world';\r\nc={'Hello' ' ' 'world'}\r\nassert(isequal(split_array(x,y),c));\r\n","published":true,"deleted":false,"likes_count":1,"comments_count":0,"created_by":971,"edited_by":null,"edited_at":null,"deleted_by":null,"deleted_at":null,"solvers_count":60,"test_suite_updated_at":"2015-02-05T18:04:21.000Z","rescore_all_solutions":false,"group_id":39,"created_at":"2015-02-05T18:02:26.000Z","updated_at":"2026-04-02T08:17:58.000Z","published_at":"2015-02-05T18:04:21.000Z","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\u003eAn array x of length n has values 1...m with each value appearing at least once. The values are sorted (n\u0026gt;=m).\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 second array y of the same size should be split into elements of a cell array c such that the first element of c contains all elements of y at the positions where x=1 and so on:\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  1  1  2  2  3  3  3  3];\\ny=   [10 52 12 58 21 43 89 27 98];\\nc{1}=[10 52 12];\\nc{2}=[         58 21];\\nc{3}=[               43 89 27 98];]]\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":2073,"title":"Split a given string from the first instance of a given character","description":"A simple operation to split a given string into two substrings at the point where the desired character is first found. e.g. \r\n\r\ninputString: 'we have 6 cars'  split it from '6'\r\n\r\noutput: 'we have ' and '6 cars'\r\n\r\nIf the desired character is not found then first substring is same as the whole string and the second string is empty string, i.e. y2='';","description_html":"\u003cp\u003eA simple operation to split a given string into two substrings at the point where the desired character is first found. e.g.\u003c/p\u003e\u003cp\u003einputString: 'we have 6 cars'  split it from '6'\u003c/p\u003e\u003cp\u003eoutput: 'we have ' and '6 cars'\u003c/p\u003e\u003cp\u003eIf the desired character is not found then first substring is same as the whole string and the second string is empty string, i.e. y2='';\u003c/p\u003e","function_template":"function [y1,y2] = SplitString(x,divider)\r\n  y1=0;\r\n  y2=0;\r\nend\r\n\r\n","test_suite":"%%\r\nx='I want to split this: from this';\r\n[y1,y2] = SplitString(x,':');\r\n\r\ny1_correct = 'I want to split this';\r\ny2_correct = ': from this';\r\n\r\nassert(isequal(y1,y1_correct))\r\nassert(isequal(y2,y2_correct))\r\n\r\n%%\r\nx='This one does not have the divider';\r\n[y1,y2] = SplitString(x,':')\r\n\r\ny1_correct = 'This one does not have the divider'\r\ny2_correct = ''\r\n\r\nassert(isequal(y1,y1_correct))\r\nassert(isequal(y2,y2_correct))\r\n\r\n%%\r\nx='This sentence should, not have a comma.';\r\n[y1,y2] = SplitString(x,',')\r\n\r\ny1_correct = 'This sentence should'\r\ny2_correct = ', not have a comma.'\r\n\r\nassert(isequal(y1,y1_correct))\r\nassert(isequal(y2,y2_correct))\r\n\r\n%%\r\nx='Divide only @ at the @ first instance of @.';\r\n[y1,y2] = SplitString(x,'@')\r\n\r\ny1_correct = 'Divide only '\r\ny2_correct = '@ at the @ first instance of @.'\r\n\r\nassert(isequal(y1,y1_correct))\r\nassert(isequal(y2,y2_correct))\r\n\r\n%%\r\nx='Take that, and this, and something else.';\r\n[y1,y2] = SplitString(x,',')\r\n\r\ny1_correct = 'Take that'\r\ny2_correct = ', and this, and something else.'\r\n\r\nassert(isequal(y1,y1_correct))\r\nassert(isequal(y2,y2_correct))\r\n","published":true,"deleted":false,"likes_count":2,"comments_count":3,"created_by":21274,"edited_by":null,"edited_at":null,"deleted_by":null,"deleted_at":null,"solvers_count":125,"test_suite_updated_at":"2017-05-31T17:36:57.000Z","rescore_all_solutions":false,"group_id":28,"created_at":"2013-12-24T17:05:02.000Z","updated_at":"2026-04-16T19:40:16.000Z","published_at":"2013-12-24T17:32:55.000Z","restored_at":null,"restored_by":null,"spam":false,"simulink":false,"admin_reviewed":false,"description_opc":"{\"relationships\":[{\"relationshipType\":\"http://schemas.mathworks.com/matlab/code/2013/relationships/document\",\"relationshipId\":\"rId1\",\"target\":\"/matlab/document.xml\"},{\"relationshipType\":\"http://schemas.mathworks.com/matlab/code/2013/relationships/output\",\"relationshipId\":\"rId2\",\"target\":\"/matlab/output.xml\"}],\"parts\":[{\"partUri\":\"/matlab/document.xml\",\"relationship\":[],\"contentType\":\"application/vnd.mathworks.matlab.code.document+xml\",\"content\":\"\u003c?xml version=\\\"1.0\\\" encoding=\\\"UTF-8\\\"?\u003e\u003cw:document xmlns:w=\\\"http://schemas.openxmlformats.org/wordprocessingml/2006/main\\\"\u003e\u003cw:body\u003e\u003cw:p\u003e\u003cw:pPr\u003e\u003cw:pStyle w:val=\\\"text\\\"/\u003e\u003c/w:pPr\u003e\u003cw:r\u003e\u003cw:t\u003eA simple operation to split a given string into two substrings at the point where the desired character is first found. e.g.\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\u003einputString: 'we have 6 cars' split it from '6'\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\u003eoutput: 'we have ' and '6 cars'\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\u003eIf the desired character is not found then first substring is same as the whole string and the second string is empty string, i.e. y2='';\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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