{"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":2159,"title":"A SUBSREF variant that accepts the 'end'-operator.","description":"Unfortunately, Matlab's |subsref| function does not support the |end| -operator. The |end| -operator is a powerfull method to refer to the rear-end of an array, \r\n\r\n a = 1:10;\r\n a(end-1) % is 9\r\n a(end-2:end) % is [8 9 10]\r\n\r\nIt works similar for cell arrays and struct-arrays.\r\n\r\nAlhough |subsref| is quite powerful, and accepts for example the |:| colon oparator, it fails to process more complex stings, including |end| -operators.\r\n\r\nThis assignment is to create a function that accepts those more complex element definitions.\r\n\r\nFor example\r\n\r\n s.a.b(3).c{2}.d = 'a':'z';\r\n subsref(s,substruct('.','a','.','b','()',{3},'.','c','{}',{2},'.','d','()',{1:3})) \r\n\r\nreturns \r\n\r\n ans = \r\n\r\n abc  \r\n\r\nAnd \r\n\r\n  subsrefbetter(s,substruct('.','a','.','b','()',{3},'.','c','{}',{2},'.','d','()',{'[1 end]'})) \r\n\r\nshould return\r\n\r\n ans = \r\n\r\n az  \r\n\r\nand \r\n\r\n  subsrefbetter(s,substruct('.','a','.','b','()',{3},'.','c','{}',{2},'.','d','()',{'end-2:end'})) \r\n\r\nshould return\r\n\r\n ans =\r\n  \r\n xyz\r\n\r\nThe function |subsrefbetter| should accept both structures like created with |substruct|, and list of arguments like accepted by |substruct|.\r\n\r\nThat's all.","description_html":"\u003cp\u003eUnfortunately, Matlab's \u003ctt\u003esubsref\u003c/tt\u003e function does not support the \u003ctt\u003eend\u003c/tt\u003e -operator. The \u003ctt\u003eend\u003c/tt\u003e -operator is a powerfull method to refer to the rear-end of an array,\u003c/p\u003e\u003cpre\u003e a = 1:10;\r\n a(end-1) % is 9\r\n a(end-2:end) % is [8 9 10]\u003c/pre\u003e\u003cp\u003eIt works similar for cell arrays and struct-arrays.\u003c/p\u003e\u003cp\u003eAlhough \u003ctt\u003esubsref\u003c/tt\u003e is quite powerful, and accepts for example the \u003ctt\u003e:\u003c/tt\u003e colon oparator, it fails to process more complex stings, including \u003ctt\u003eend\u003c/tt\u003e -operators.\u003c/p\u003e\u003cp\u003eThis assignment is to create a function that accepts those more complex element definitions.\u003c/p\u003e\u003cp\u003eFor example\u003c/p\u003e\u003cpre\u003e s.a.b(3).c{2}.d = 'a':'z';\r\n subsref(s,substruct('.','a','.','b','()',{3},'.','c','{}',{2},'.','d','()',{1:3})) \u003c/pre\u003e\u003cp\u003ereturns\u003c/p\u003e\u003cpre\u003e ans = \u003c/pre\u003e\u003cpre\u003e abc  \u003c/pre\u003e\u003cp\u003eAnd\u003c/p\u003e\u003cpre class=\"language-matlab\"\u003esubsrefbetter(s,substruct('.','a','.','b','()',{3},'.','c','{}',{2},'.','d','()',{'[1 end]'})) \r\n\u003c/pre\u003e\u003cp\u003eshould return\u003c/p\u003e\u003cpre\u003e ans = \u003c/pre\u003e\u003cpre\u003e az  \u003c/pre\u003e\u003cp\u003eand\u003c/p\u003e\u003cpre class=\"language-matlab\"\u003esubsrefbetter(s,substruct('.','a','.','b','()',{3},'.','c','{}',{2},'.','d','()',{'end-2:end'})) \r\n\u003c/pre\u003e\u003cp\u003eshould return\u003c/p\u003e\u003cpre\u003e ans =\u003c/pre\u003e\u003cpre\u003e xyz\u003c/pre\u003e\u003cp\u003eThe function \u003ctt\u003esubsrefbetter\u003c/tt\u003e should accept both structures like created with \u003ctt\u003esubstruct\u003c/tt\u003e, and list of arguments like accepted by \u003ctt\u003esubstruct\u003c/tt\u003e.\u003c/p\u003e\u003cp\u003eThat's all.\u003c/p\u003e","function_template":"function y = subsrefbetter(s,varargin)\r\n  if isstruct(varargin{1})\r\n    def = varargin{1};\r\n  else\r\n    def = substruct(varargin{:});\r\n  end\r\n  y = subsref(s,def);\r\nend","test_suite":"%%\r\nnocheat = isempty(regexp(evalc('type subsrefbetter'),'(eval|regexprep|inline|str2func)'));\r\ns.a.b(3).c{2}.d = 'a':'z';\r\ndef = substruct('.','a','.','b','()',{3},'.','c','{}',{2},'.','d','()',{1:3});\r\ny = subsrefbetter(s,def);\r\nassert(isequal(y,'abc') \u0026\u0026 nocheat)\r\n\r\n%%\r\nnocheat = isempty(regexp(evalc('type subsrefbetter'),'(eval|regexprep|inline|str2func)'));\r\ns.a.B(1).c{2}.d = 'a':'z';\r\ndef = substruct('.','a','.','B','()',{1},'.','c','{}',{2},'.','d','()',{'end'});\r\ny = subsrefbetter(s,def);\r\nassert(isequal(y,'z') \u0026\u0026 nocheat)\r\n\r\n%%\r\nnocheat = isempty(regexp(evalc('type subsrefbetter'),'(eval|regexprep|inline|str2func)'));\r\ns.oz = magic(7);\r\ndef = substruct('.','oz','()',{'end-1' 'end-2:7'});\r\ny = subsrefbetter(s,def);\r\nassert(isequal(y,[43 3 12]) \u0026\u0026 nocheat)\r\n\r\n%%\r\nnocheat = isempty(regexp(evalc('type subsrefbetter'),'(eval|regexprep|inline|str2func)'));\r\n[s(1:3).TiTa] = deal(magic(3));\r\ndef = substruct('()',{2},'.','TiTa','()',{':' ':'});\r\ny = subsrefbetter(s,def);\r\nassert(isequal(y,magic(3)) \u0026\u0026 nocheat)\r\n","published":true,"deleted":false,"likes_count":1,"comments_count":1,"created_by":6556,"edited_by":null,"edited_at":null,"deleted_by":null,"deleted_at":null,"solvers_count":5,"test_suite_updated_at":"2014-02-06T14:15:01.000Z","rescore_all_solutions":false,"group_id":1,"created_at":"2014-02-06T13:44:43.000Z","updated_at":"2025-05-03T05:28:58.000Z","published_at":"2014-02-06T14:15:01.000Z","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\u003eUnfortunately, Matlab's\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\u003esubsref\u003c/w:t\u003e\u003c/w:r\u003e\u003cw:r\u003e\u003cw:t\u003e function does not support the\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\u003eend\u003c/w:t\u003e\u003c/w:r\u003e\u003cw:r\u003e\u003cw:t\u003e -operator. The\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\u003eend\u003c/w:t\u003e\u003c/w:r\u003e\u003cw:r\u003e\u003cw:t\u003e -operator is a powerfull method to refer to the rear-end of an array,\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 = 1:10;\\n a(end-1) % is 9\\n a(end-2:end) % is [8 9 10]]]\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\u003eIt works similar for cell arrays and struct-arrays.\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\u003eAlhough\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\u003esubsref\u003c/w:t\u003e\u003c/w:r\u003e\u003cw:r\u003e\u003cw:t\u003e is quite powerful, and accepts for example the\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:\u003c/w:t\u003e\u003c/w:r\u003e\u003cw:r\u003e\u003cw:t\u003e colon oparator, it fails to process more complex stings, including\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\u003eend\u003c/w:t\u003e\u003c/w:r\u003e\u003cw:r\u003e\u003cw:t\u003e -operators.\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\u003eThis assignment is to create a function that accepts those more complex element definitions.\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\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.a.b(3).c{2}.d = 'a':'z';\\n subsref(s,substruct('.','a','.','b','()',{3},'.','c','{}',{2},'.','d','()',{1:3}))]]\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\u003ereturns\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[ ans = \\n\\n abc]]\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\u003eAnd\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[subsrefbetter(s,substruct('.','a','.','b','()',{3},'.','c','{}',{2},'.','d','()',{'[1 end]'}))]]\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\u003eshould return\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[ ans = \\n\\n az]]\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\u003eand\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[subsrefbetter(s,substruct('.','a','.','b','()',{3},'.','c','{}',{2},'.','d','()',{'end-2:end'}))]]\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\u003eshould return\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[ ans =\\n\\n xyz]]\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\u003eThe function\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\u003esubsrefbetter\u003c/w:t\u003e\u003c/w:r\u003e\u003cw:r\u003e\u003cw:t\u003e should accept both structures like created with\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\u003esubstruct\u003c/w:t\u003e\u003c/w:r\u003e\u003cw:r\u003e\u003cw:t\u003e, and list of arguments like accepted by\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\u003esubstruct\u003c/w:t\u003e\u003c/w:r\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\u003eThat's all.\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":2159,"title":"A SUBSREF variant that accepts the 'end'-operator.","description":"Unfortunately, Matlab's |subsref| function does not support the |end| -operator. The |end| -operator is a powerfull method to refer to the rear-end of an array, \r\n\r\n a = 1:10;\r\n a(end-1) % is 9\r\n a(end-2:end) % is [8 9 10]\r\n\r\nIt works similar for cell arrays and struct-arrays.\r\n\r\nAlhough |subsref| is quite powerful, and accepts for example the |:| colon oparator, it fails to process more complex stings, including |end| -operators.\r\n\r\nThis assignment is to create a function that accepts those more complex element definitions.\r\n\r\nFor example\r\n\r\n s.a.b(3).c{2}.d = 'a':'z';\r\n subsref(s,substruct('.','a','.','b','()',{3},'.','c','{}',{2},'.','d','()',{1:3})) \r\n\r\nreturns \r\n\r\n ans = \r\n\r\n abc  \r\n\r\nAnd \r\n\r\n  subsrefbetter(s,substruct('.','a','.','b','()',{3},'.','c','{}',{2},'.','d','()',{'[1 end]'})) \r\n\r\nshould return\r\n\r\n ans = \r\n\r\n az  \r\n\r\nand \r\n\r\n  subsrefbetter(s,substruct('.','a','.','b','()',{3},'.','c','{}',{2},'.','d','()',{'end-2:end'})) \r\n\r\nshould return\r\n\r\n ans =\r\n  \r\n xyz\r\n\r\nThe function |subsrefbetter| should accept both structures like created with |substruct|, and list of arguments like accepted by |substruct|.\r\n\r\nThat's all.","description_html":"\u003cp\u003eUnfortunately, Matlab's \u003ctt\u003esubsref\u003c/tt\u003e function does not support the \u003ctt\u003eend\u003c/tt\u003e -operator. The \u003ctt\u003eend\u003c/tt\u003e -operator is a powerfull method to refer to the rear-end of an array,\u003c/p\u003e\u003cpre\u003e a = 1:10;\r\n a(end-1) % is 9\r\n a(end-2:end) % is [8 9 10]\u003c/pre\u003e\u003cp\u003eIt works similar for cell arrays and struct-arrays.\u003c/p\u003e\u003cp\u003eAlhough \u003ctt\u003esubsref\u003c/tt\u003e is quite powerful, and accepts for example the \u003ctt\u003e:\u003c/tt\u003e colon oparator, it fails to process more complex stings, including \u003ctt\u003eend\u003c/tt\u003e -operators.\u003c/p\u003e\u003cp\u003eThis assignment is to create a function that accepts those more complex element definitions.\u003c/p\u003e\u003cp\u003eFor example\u003c/p\u003e\u003cpre\u003e s.a.b(3).c{2}.d = 'a':'z';\r\n subsref(s,substruct('.','a','.','b','()',{3},'.','c','{}',{2},'.','d','()',{1:3})) \u003c/pre\u003e\u003cp\u003ereturns\u003c/p\u003e\u003cpre\u003e ans = \u003c/pre\u003e\u003cpre\u003e abc  \u003c/pre\u003e\u003cp\u003eAnd\u003c/p\u003e\u003cpre class=\"language-matlab\"\u003esubsrefbetter(s,substruct('.','a','.','b','()',{3},'.','c','{}',{2},'.','d','()',{'[1 end]'})) \r\n\u003c/pre\u003e\u003cp\u003eshould return\u003c/p\u003e\u003cpre\u003e ans = \u003c/pre\u003e\u003cpre\u003e az  \u003c/pre\u003e\u003cp\u003eand\u003c/p\u003e\u003cpre class=\"language-matlab\"\u003esubsrefbetter(s,substruct('.','a','.','b','()',{3},'.','c','{}',{2},'.','d','()',{'end-2:end'})) \r\n\u003c/pre\u003e\u003cp\u003eshould return\u003c/p\u003e\u003cpre\u003e ans =\u003c/pre\u003e\u003cpre\u003e xyz\u003c/pre\u003e\u003cp\u003eThe function \u003ctt\u003esubsrefbetter\u003c/tt\u003e should accept both structures like created with \u003ctt\u003esubstruct\u003c/tt\u003e, and list of arguments like accepted by \u003ctt\u003esubstruct\u003c/tt\u003e.\u003c/p\u003e\u003cp\u003eThat's all.\u003c/p\u003e","function_template":"function y = subsrefbetter(s,varargin)\r\n  if isstruct(varargin{1})\r\n    def = varargin{1};\r\n  else\r\n    def = substruct(varargin{:});\r\n  end\r\n  y = subsref(s,def);\r\nend","test_suite":"%%\r\nnocheat = isempty(regexp(evalc('type subsrefbetter'),'(eval|regexprep|inline|str2func)'));\r\ns.a.b(3).c{2}.d = 'a':'z';\r\ndef = substruct('.','a','.','b','()',{3},'.','c','{}',{2},'.','d','()',{1:3});\r\ny = subsrefbetter(s,def);\r\nassert(isequal(y,'abc') \u0026\u0026 nocheat)\r\n\r\n%%\r\nnocheat = isempty(regexp(evalc('type subsrefbetter'),'(eval|regexprep|inline|str2func)'));\r\ns.a.B(1).c{2}.d = 'a':'z';\r\ndef = substruct('.','a','.','B','()',{1},'.','c','{}',{2},'.','d','()',{'end'});\r\ny = subsrefbetter(s,def);\r\nassert(isequal(y,'z') \u0026\u0026 nocheat)\r\n\r\n%%\r\nnocheat = isempty(regexp(evalc('type subsrefbetter'),'(eval|regexprep|inline|str2func)'));\r\ns.oz = magic(7);\r\ndef = substruct('.','oz','()',{'end-1' 'end-2:7'});\r\ny = subsrefbetter(s,def);\r\nassert(isequal(y,[43 3 12]) \u0026\u0026 nocheat)\r\n\r\n%%\r\nnocheat = isempty(regexp(evalc('type subsrefbetter'),'(eval|regexprep|inline|str2func)'));\r\n[s(1:3).TiTa] = deal(magic(3));\r\ndef = substruct('()',{2},'.','TiTa','()',{':' ':'});\r\ny = subsrefbetter(s,def);\r\nassert(isequal(y,magic(3)) \u0026\u0026 nocheat)\r\n","published":true,"deleted":false,"likes_count":1,"comments_count":1,"created_by":6556,"edited_by":null,"edited_at":null,"deleted_by":null,"deleted_at":null,"solvers_count":5,"test_suite_updated_at":"2014-02-06T14:15:01.000Z","rescore_all_solutions":false,"group_id":1,"created_at":"2014-02-06T13:44:43.000Z","updated_at":"2025-05-03T05:28:58.000Z","published_at":"2014-02-06T14:15:01.000Z","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\u003eUnfortunately, Matlab's\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\u003esubsref\u003c/w:t\u003e\u003c/w:r\u003e\u003cw:r\u003e\u003cw:t\u003e function does not support the\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\u003eend\u003c/w:t\u003e\u003c/w:r\u003e\u003cw:r\u003e\u003cw:t\u003e -operator. The\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\u003eend\u003c/w:t\u003e\u003c/w:r\u003e\u003cw:r\u003e\u003cw:t\u003e -operator is a powerfull method to refer to the rear-end of an array,\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 = 1:10;\\n a(end-1) % is 9\\n a(end-2:end) % is [8 9 10]]]\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\u003eIt works similar for cell arrays and struct-arrays.\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\u003eAlhough\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\u003esubsref\u003c/w:t\u003e\u003c/w:r\u003e\u003cw:r\u003e\u003cw:t\u003e is quite powerful, and accepts for example the\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:\u003c/w:t\u003e\u003c/w:r\u003e\u003cw:r\u003e\u003cw:t\u003e colon oparator, it fails to process more complex stings, including\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\u003eend\u003c/w:t\u003e\u003c/w:r\u003e\u003cw:r\u003e\u003cw:t\u003e -operators.\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\u003eThis assignment is to create a function that accepts those more complex element definitions.\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\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.a.b(3).c{2}.d = 'a':'z';\\n subsref(s,substruct('.','a','.','b','()',{3},'.','c','{}',{2},'.','d','()',{1:3}))]]\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\u003ereturns\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[ ans = \\n\\n abc]]\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\u003eAnd\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[subsrefbetter(s,substruct('.','a','.','b','()',{3},'.','c','{}',{2},'.','d','()',{'[1 end]'}))]]\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\u003eshould return\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[ ans = \\n\\n az]]\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\u003eand\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[subsrefbetter(s,substruct('.','a','.','b','()',{3},'.','c','{}',{2},'.','d','()',{'end-2:end'}))]]\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\u003eshould return\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[ ans =\\n\\n xyz]]\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\u003eThe function\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\u003esubsrefbetter\u003c/w:t\u003e\u003c/w:r\u003e\u003cw:r\u003e\u003cw:t\u003e should accept both structures like created with\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\u003esubstruct\u003c/w:t\u003e\u003c/w:r\u003e\u003cw:r\u003e\u003cw:t\u003e, and list of arguments like accepted by\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\u003esubstruct\u003c/w:t\u003e\u003c/w:r\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\u003eThat's all.\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:\"data structure\"","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:\"data structure\"","current_player":null,"sort":"map(difficulty_value,0,0,999) asc"},"parser":"MathWorks::Search::Solr::QueryParser","directives":{"term":{"directives":{"tag":[["tag:\"data structure\"","","\"","data structure","\""]]}}},"facets":{"#\u003cMathWorks::Search::Field:0x00007f5e891e5b60\u003e":null,"#\u003cMathWorks::Search::Field:0x00007f5e891e5ac0\u003e":null},"filters":{"#\u003cMathWorks::Search::Field:0x00007f5e891e5200\u003e":"\"cody:problem\""},"fields":{"#\u003cMathWorks::Search::Field:0x00007f5e891e5de0\u003e":1,"#\u003cMathWorks::Search::Field:0x00007f5e891e5d40\u003e":50,"#\u003cMathWorks::Search::Field:0x00007f5e891e5ca0\u003e":"map(difficulty_value,0,0,999) asc","#\u003cMathWorks::Search::Field:0x00007f5e891e5c00\u003e":"tag:\"data structure\""},"user_query":{"#\u003cMathWorks::Search::Field:0x00007f5e891e5c00\u003e":"tag:\"data structure\""},"queried_facets":{}},"query_backend":{"connection":{"configuration":{"index_url":"http://index-op-v2/solr/","query_url":"http://search-op-v2/solr/","direct_access_index_urls":["http://index-op-v2/solr/"],"direct_access_query_urls":["http://search-op-v2/solr/"],"timeout":10,"vhost":"search","exchange":"search.topic","heartbeat":30,"pre_index_mode":false,"host":"rabbitmq-eks","port":5672,"username":"cody-search","password":"78X075ddcV44","virtual_host":"search","indexer":"amqp","http_logging":"true","core":"cody"},"query_connection":{"uri":"http://search-op-v2/solr/cody/","proxy":null,"connection":{"parallel_manager":null,"headers":{"User-Agent":"Faraday v1.0.1"},"params":{},"options":{"params_encoder":"Faraday::FlatParamsEncoder","proxy":null,"bind":null,"timeout":null,"open_timeout":null,"read_timeout":null,"write_timeout":null,"boundary":null,"oauth":null,"context":null,"on_data":null},"ssl":{"verify":true,"ca_file":null,"ca_path":null,"verify_mode":null,"cert_store":null,"client_cert":null,"client_key":null,"certificate":null,"private_key":null,"verify_depth":null,"version":null,"min_version":null,"max_version":null},"default_parallel_manager":null,"builder":{"adapter":{"name":"Faraday::Adapter::NetHttp","args":[],"block":null},"handlers":[{"name":"Faraday::Response::RaiseError","args":[],"block":null}],"app":{"app":{"ssl_cert_store":{"verify_callback":null,"error":null,"error_string":null,"chain":null,"time":null},"app":{},"connection_options":{},"config_block":null}}},"url_prefix":"http://search-op-v2/solr/cody/","manual_proxy":false,"proxy":null},"update_format":"RSolr::JSON::Generator","update_path":"update","options":{"url":"http://search-op-v2/solr/cody"}}},"query":{"params":{"per_page":50,"term":"tag:\"data structure\"","current_player":null,"sort":"map(difficulty_value,0,0,999) asc"},"parser":"MathWorks::Search::Solr::QueryParser","directives":{"term":{"directives":{"tag":[["tag:\"data structure\"","","\"","data structure","\""]]}}},"facets":{"#\u003cMathWorks::Search::Field:0x00007f5e891e5b60\u003e":null,"#\u003cMathWorks::Search::Field:0x00007f5e891e5ac0\u003e":null},"filters":{"#\u003cMathWorks::Search::Field:0x00007f5e891e5200\u003e":"\"cody:problem\""},"fields":{"#\u003cMathWorks::Search::Field:0x00007f5e891e5de0\u003e":1,"#\u003cMathWorks::Search::Field:0x00007f5e891e5d40\u003e":50,"#\u003cMathWorks::Search::Field:0x00007f5e891e5ca0\u003e":"map(difficulty_value,0,0,999) asc","#\u003cMathWorks::Search::Field:0x00007f5e891e5c00\u003e":"tag:\"data structure\""},"user_query":{"#\u003cMathWorks::Search::Field:0x00007f5e891e5c00\u003e":"tag:\"data structure\""},"queried_facets":{}},"options":{"fields":["id","difficulty_rating"]},"join":" "},"results":[{"id":2159,"difficulty_rating":"hard"}]}}