{"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":43685,"title":"Apply Function to Each Field of a Structure Array: Part 1","description":"The builtin \u003chttp://www.mathworks.com/help/matlab/ref/structfun.html?=structfun structfun\u003e applies a function handle to each field of a *scalar structure*, but it does not work for structure array. The purpose of this problem is to generalize structfun to enable support for structure array input.\r\n\r\nWrite your own function *structfun2* which accepts a structure array *s* and a function handle *f* as the inputs. The output *c = structfun2(f,s)* is a cell array of the same size as *s*, with each cell storing the result of *f* applied to every field of the relevant structure element in *s*. The structfun2 must preserve the behavior of structfun for scalar structure input. That is, structfun2(f,s) = structfun(f,s) holds for any scalar structure *s*. The assumption required is that *f* is a function that returns a scalar, regardless of the input. \r\n\r\nExample: \r\n\r\n  s = struct('f1',{1, [3 4]; 1, [5 6]},'f2',{[1 2], 2; [3 4 5], [2 5]});\r\n  f = @numel;\r\n  c = {[1;2], [2;1]; [1;3], [2;2]};\r\n\r\nRelated problems in this series:\r\n\r\n* \u003chttp://www.mathworks.com/matlabcentral/cody/problems/43686-apply-function-to-each-field-of-a-structure-array-part-2 Apply Function to Each Field of a Structure Array: Part 2\u003e\r\n* \u003chttp://www.mathworks.com/matlabcentral/cody/problems/43685-apply-function-to-each-field-of-a-structure-array-part-1 Apply Function to Each Field of a Structure Array: Part 1\u003e","description_html":"\u003cp\u003eThe builtin \u003ca href = \"http://www.mathworks.com/help/matlab/ref/structfun.html?=structfun\"\u003estructfun\u003c/a\u003e applies a function handle to each field of a \u003cb\u003escalar structure\u003c/b\u003e, but it does not work for structure array. The purpose of this problem is to generalize structfun to enable support for structure array input.\u003c/p\u003e\u003cp\u003eWrite your own function \u003cb\u003estructfun2\u003c/b\u003e which accepts a structure array \u003cb\u003es\u003c/b\u003e and a function handle \u003cb\u003ef\u003c/b\u003e as the inputs. The output \u003cb\u003ec = structfun2(f,s)\u003c/b\u003e is a cell array of the same size as \u003cb\u003es\u003c/b\u003e, with each cell storing the result of \u003cb\u003ef\u003c/b\u003e applied to every field of the relevant structure element in \u003cb\u003es\u003c/b\u003e. The structfun2 must preserve the behavior of structfun for scalar structure input. That is, structfun2(f,s) = structfun(f,s) holds for any scalar structure \u003cb\u003es\u003c/b\u003e. The assumption required is that \u003cb\u003ef\u003c/b\u003e is a function that returns a scalar, regardless of the input.\u003c/p\u003e\u003cp\u003eExample:\u003c/p\u003e\u003cpre class=\"language-matlab\"\u003es = struct('f1',{1, [3 4]; 1, [5 6]},'f2',{[1 2], 2; [3 4 5], [2 5]});\r\nf = @numel;\r\nc = {[1;2], [2;1]; [1;3], [2;2]};\r\n\u003c/pre\u003e\u003cp\u003eRelated problems in this series:\u003c/p\u003e\u003cul\u003e\u003cli\u003e\u003ca href = \"http://www.mathworks.com/matlabcentral/cody/problems/43686-apply-function-to-each-field-of-a-structure-array-part-2\"\u003eApply Function to Each Field of a Structure Array: Part 2\u003c/a\u003e\u003c/li\u003e\u003cli\u003e\u003ca href = \"http://www.mathworks.com/matlabcentral/cody/problems/43685-apply-function-to-each-field-of-a-structure-array-part-1\"\u003eApply Function to Each Field of a Structure Array: Part 1\u003c/a\u003e\u003c/li\u003e\u003c/ul\u003e","function_template":"function y = structfun2(f,s)\r\n  y = x;\r\nend","test_suite":"%%\r\ns.f1 = 'Sunday';\r\ns.f2 = 'Monday';\r\ns.f3 = 'Tuesday'; \r\ns.f4 = 'Wednesday';\r\ns.f5 = 'Thursday';\r\ns.f6 = 'Friday';\r\ns.f7 = 'Saturday';\r\nf = @numel;\r\nc = structfun(@numel, s);\r\nassert(isequal(structfun2(f,s),c))\r\n\r\n%%\r\ns = struct('f1',{1, [3 4]; 1, [5 6]},'f2',{[1 2], 2; [3 4 5], [2 5]});\r\nf = @(x)min(x(:));\r\nc = {[1;1], [3;2]; [1;3], [5;2]};\r\nassert(isequal(structfun2(f,s),c))\r\n\r\n%%\r\ns = struct('f1',{1, [3 4]; 1, [5 6]},'f2',{[1 2], 2; [3 4 5], [2 5]});\r\nf = @(x)max(x(:));\r\nc = {[1;2], [4;2]; [1;5], [6;5]};\r\nassert(isequal(structfun2(f,s),c))\r\n\r\n%%\r\ns = struct('f1',{0, [3 4]; 1, [5 7 6]},'f2',{[0 0], 2; [2 4 5], [0 5]});\r\nf = @nnz;\r\nc = {[0;0], [2;1]; [1;3], [3;1]};\r\nassert(isequal(structfun2(f,s),c))\r\n","published":true,"deleted":false,"likes_count":1,"comments_count":0,"created_by":12569,"edited_by":null,"edited_at":null,"deleted_by":null,"deleted_at":null,"solvers_count":32,"test_suite_updated_at":"2016-12-01T22:39:09.000Z","rescore_all_solutions":false,"group_id":1,"created_at":"2016-11-27T01:04:06.000Z","updated_at":"2026-04-08T13:59:11.000Z","published_at":"2016-11-27T01:32:39.000Z","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\u003eThe builtin\u003c/w:t\u003e\u003c/w:r\u003e\u003cw:r\u003e\u003cw:t\u003e \u003c/w:t\u003e\u003c/w:r\u003e\u003cw:hyperlink w:docLocation=\\\"http://www.mathworks.com/help/matlab/ref/structfun.html?=structfun\\\"\u003e\u003cw:r\u003e\u003cw:t\u003estructfun\u003c/w:t\u003e\u003c/w:r\u003e\u003c/w:hyperlink\u003e\u003cw:r\u003e\u003cw:t\u003e applies a function handle to each field of a\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:b/\u003e\u003c/w:rPr\u003e\u003cw:t\u003escalar structure\u003c/w:t\u003e\u003c/w:r\u003e\u003cw:r\u003e\u003cw:t\u003e, but it does not work for structure array. The purpose of this problem is to generalize structfun to enable support for structure array input.\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\u003eWrite your own 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:b/\u003e\u003c/w:rPr\u003e\u003cw:t\u003estructfun2\u003c/w:t\u003e\u003c/w:r\u003e\u003cw:r\u003e\u003cw:t\u003e which accepts a structure array\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:b/\u003e\u003c/w:rPr\u003e\u003cw:t\u003es\u003c/w:t\u003e\u003c/w:r\u003e\u003cw:r\u003e\u003cw:t\u003e and a function handle\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:b/\u003e\u003c/w:rPr\u003e\u003cw:t\u003ef\u003c/w:t\u003e\u003c/w:r\u003e\u003cw:r\u003e\u003cw:t\u003e as the inputs. The output\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:b/\u003e\u003c/w:rPr\u003e\u003cw:t\u003ec = structfun2(f,s)\u003c/w:t\u003e\u003c/w:r\u003e\u003cw:r\u003e\u003cw:t\u003e is a cell array of the same size as\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:b/\u003e\u003c/w:rPr\u003e\u003cw:t\u003es\u003c/w:t\u003e\u003c/w:r\u003e\u003cw:r\u003e\u003cw:t\u003e, with each cell storing the result of\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:b/\u003e\u003c/w:rPr\u003e\u003cw:t\u003ef\u003c/w:t\u003e\u003c/w:r\u003e\u003cw:r\u003e\u003cw:t\u003e applied to every field of the relevant structure element in\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:b/\u003e\u003c/w:rPr\u003e\u003cw:t\u003es\u003c/w:t\u003e\u003c/w:r\u003e\u003cw:r\u003e\u003cw:t\u003e. The structfun2 must preserve the behavior of structfun for scalar structure input. That is, structfun2(f,s) = structfun(f,s) holds for any scalar structure\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:b/\u003e\u003c/w:rPr\u003e\u003cw:t\u003es\u003c/w:t\u003e\u003c/w:r\u003e\u003cw:r\u003e\u003cw:t\u003e. The assumption required is that\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:b/\u003e\u003c/w:rPr\u003e\u003cw:t\u003ef\u003c/w:t\u003e\u003c/w:r\u003e\u003cw:r\u003e\u003cw:t\u003e is a function that returns a scalar, regardless of the input.\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[s = struct('f1',{1, [3 4]; 1, [5 6]},'f2',{[1 2], 2; [3 4 5], [2 5]});\\nf = @numel;\\nc = {[1;2], [2;1]; [1;3], [2;2]};]]\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\u003eRelated problems in this series:\u003c/w:t\u003e\u003c/w:r\u003e\u003c/w:p\u003e\u003cw:p\u003e\u003cw:pPr\u003e\u003cw:pStyle w:val=\\\"ListParagraph\\\"/\u003e\u003cw:numPr\u003e\u003cw:numId w:val=\\\"1\\\"/\u003e\u003c/w:numPr\u003e\u003c/w:pPr\u003e\u003cw:hyperlink w:docLocation=\\\"http://www.mathworks.com/matlabcentral/cody/problems/43686-apply-function-to-each-field-of-a-structure-array-part-2\\\"\u003e\u003cw:r\u003e\u003cw:t\u003eApply Function to Each Field of a Structure Array: Part 2\u003c/w:t\u003e\u003c/w:r\u003e\u003c/w:hyperlink\u003e\u003c/w:p\u003e\u003cw:p\u003e\u003cw:pPr\u003e\u003cw:pStyle w:val=\\\"ListParagraph\\\"/\u003e\u003cw:numPr\u003e\u003cw:numId w:val=\\\"1\\\"/\u003e\u003c/w:numPr\u003e\u003c/w:pPr\u003e\u003cw:hyperlink w:docLocation=\\\"http://www.mathworks.com/matlabcentral/cody/problems/43685-apply-function-to-each-field-of-a-structure-array-part-1\\\"\u003e\u003cw:r\u003e\u003cw:t\u003eApply Function to Each Field of a Structure Array: Part 1\u003c/w:t\u003e\u003c/w:r\u003e\u003c/w:hyperlink\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":43686,"title":"Apply Function to Each Field of a Structure Array: Part 2","description":"The builtin \u003chttp://www.mathworks.com/help/matlab/ref/structfun.html?=structfun structfun\u003e applies a function handle to each field of a *scalar structure*, but it does not work for structure array. The purpose of this problem is to generalize structfun to enable support for structure array input.\r\n\r\nWrite your own function *structfun2* which accepts a structure array *s* and a function handle *f* as the inputs. The output *c = structfun2(f,s)* is a structure array *c* of the same size and same fields as *s*, where each field of the structure element of c stores the result of *f* applied to the same field of the relevant structure element in *s*. The structfun2 must preserve the behavior of structfun for scalar structure input. That is, when *s* is a scalar structure, your output reduces to c = structfun(f,s,'UniformOutput',false). No assumption on *f* is needed in this problem. \r\n \r\n\r\nExample: \r\n\r\n  s = struct('f1',{1, [3 4]; 1, [5 6]},'f2',{[1 2], 2; [3 4 5], [2 5]});\r\n  f = @numel;\r\n  c = struct('f1',{1, 2; 1, 2},'f2',{2, 1; 3, 2});\r\n\r\nRelated problems in this series:\r\n\r\n* \u003chttp://www.mathworks.com/matlabcentral/cody/problems/43685-apply-function-to-each-field-of-a-structure-array-part-1 Apply Function to Each Field of a Structure Array: Part 1\u003e\r\n* \u003chttp://www.mathworks.com/matlabcentral/cody/problems/43686-apply-function-to-each-field-of-a-structure-array-part-2 Apply Function to Each Field of a Structure Array: Part 2\u003e\r\n","description_html":"\u003cp\u003eThe builtin \u003ca href = \"http://www.mathworks.com/help/matlab/ref/structfun.html?=structfun\"\u003estructfun\u003c/a\u003e applies a function handle to each field of a \u003cb\u003escalar structure\u003c/b\u003e, but it does not work for structure array. The purpose of this problem is to generalize structfun to enable support for structure array input.\u003c/p\u003e\u003cp\u003eWrite your own function \u003cb\u003estructfun2\u003c/b\u003e which accepts a structure array \u003cb\u003es\u003c/b\u003e and a function handle \u003cb\u003ef\u003c/b\u003e as the inputs. The output \u003cb\u003ec = structfun2(f,s)\u003c/b\u003e is a structure array \u003cb\u003ec\u003c/b\u003e of the same size and same fields as \u003cb\u003es\u003c/b\u003e, where each field of the structure element of c stores the result of \u003cb\u003ef\u003c/b\u003e applied to the same field of the relevant structure element in \u003cb\u003es\u003c/b\u003e. The structfun2 must preserve the behavior of structfun for scalar structure input. That is, when \u003cb\u003es\u003c/b\u003e is a scalar structure, your output reduces to c = structfun(f,s,'UniformOutput',false). No assumption on \u003cb\u003ef\u003c/b\u003e is needed in this problem.\u003c/p\u003e\u003cp\u003eExample:\u003c/p\u003e\u003cpre class=\"language-matlab\"\u003es = struct('f1',{1, [3 4]; 1, [5 6]},'f2',{[1 2], 2; [3 4 5], [2 5]});\r\nf = @numel;\r\nc = struct('f1',{1, 2; 1, 2},'f2',{2, 1; 3, 2});\r\n\u003c/pre\u003e\u003cp\u003eRelated problems in this series:\u003c/p\u003e\u003cul\u003e\u003cli\u003e\u003ca href = \"http://www.mathworks.com/matlabcentral/cody/problems/43685-apply-function-to-each-field-of-a-structure-array-part-1\"\u003eApply Function to Each Field of a Structure Array: Part 1\u003c/a\u003e\u003c/li\u003e\u003cli\u003e\u003ca href = \"http://www.mathworks.com/matlabcentral/cody/problems/43686-apply-function-to-each-field-of-a-structure-array-part-2\"\u003eApply Function to Each Field of a Structure Array: Part 2\u003c/a\u003e\u003c/li\u003e\u003c/ul\u003e","function_template":"function y = structfun2(f,s)\r\n  y = s;\r\nend","test_suite":"%%\r\ns.f1 = 'Sunday';\r\ns.f2 = 'Monday';\r\ns.f3 = 'Tuesday'; \r\ns.f4 = 'Wednesday';\r\ns.f5 = 'Thursday';\r\ns.f6 = 'Friday';\r\ns.f7 = 'Saturday';\r\nf = @(x)x(1:3);\r\nc = structfun(f,s,'UniformOutput',false);\r\nassert(isequal(structfun2(f,s),c))\r\n\r\n%%\r\ns = struct('f1',{1, [3 4;5 6]; 1, [5 6;7 8]},'f2',{[1 2], 2; [3 4 5;6 7 8], [2 6;4 5]});\r\nf = @min;\r\nc = struct('f1',{1, [3 4]; 1, [5 6]},'f2',{1, 2; [3 4 5], [2 5]});\r\nassert(isequal(structfun2(f,s),c))\r\n\r\n%%\r\ns = struct('f1',{1, [3 4;5 6]; 1, [5 6;7 8]},'f2',{[1 2], 2; [3 4 5;6 7 8], [2 6;4 5]});\r\nf = @sum;\r\nc = struct('f1',{1, [8 10]; 1, [12 14]},'f2',{3, 2; [9 11 13], [6 11]});\r\nassert(isequal(structfun2(f,s),c))\r\n\r\n%%\r\ns = struct('f1',{1, [3 4;5 6]; 1, [5 6;7 8]},'f2',{[1 2], 2; [3 4 5;6 7 8], [2 6;4 5]});\r\nf = @pow2;\r\nc = struct('f1',{2, [8 16;32 64]; 2, [32 64;128 256]},'f2',{[2 4], 4; [8 16 32;64 128 256], [4 64;16 32]});\r\nassert(isequal(structfun2(f,s),c))\r\n","published":true,"deleted":false,"likes_count":1,"comments_count":1,"created_by":12569,"edited_by":null,"edited_at":null,"deleted_by":null,"deleted_at":null,"solvers_count":25,"test_suite_updated_at":"2016-12-01T22:27:07.000Z","rescore_all_solutions":false,"group_id":1,"created_at":"2016-11-27T02:12:26.000Z","updated_at":"2026-04-08T14:13:31.000Z","published_at":"2016-11-27T02:12:31.000Z","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\u003eThe builtin\u003c/w:t\u003e\u003c/w:r\u003e\u003cw:r\u003e\u003cw:t\u003e \u003c/w:t\u003e\u003c/w:r\u003e\u003cw:hyperlink w:docLocation=\\\"http://www.mathworks.com/help/matlab/ref/structfun.html?=structfun\\\"\u003e\u003cw:r\u003e\u003cw:t\u003estructfun\u003c/w:t\u003e\u003c/w:r\u003e\u003c/w:hyperlink\u003e\u003cw:r\u003e\u003cw:t\u003e applies a function handle to each field of a\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:b/\u003e\u003c/w:rPr\u003e\u003cw:t\u003escalar structure\u003c/w:t\u003e\u003c/w:r\u003e\u003cw:r\u003e\u003cw:t\u003e, but it does not work for structure array. The purpose of this problem is to generalize structfun to enable support for structure array input.\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\u003eWrite your own 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:b/\u003e\u003c/w:rPr\u003e\u003cw:t\u003estructfun2\u003c/w:t\u003e\u003c/w:r\u003e\u003cw:r\u003e\u003cw:t\u003e which accepts a structure array\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:b/\u003e\u003c/w:rPr\u003e\u003cw:t\u003es\u003c/w:t\u003e\u003c/w:r\u003e\u003cw:r\u003e\u003cw:t\u003e and a function handle\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:b/\u003e\u003c/w:rPr\u003e\u003cw:t\u003ef\u003c/w:t\u003e\u003c/w:r\u003e\u003cw:r\u003e\u003cw:t\u003e as the inputs. The output\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:b/\u003e\u003c/w:rPr\u003e\u003cw:t\u003ec = structfun2(f,s)\u003c/w:t\u003e\u003c/w:r\u003e\u003cw:r\u003e\u003cw:t\u003e is a structure array\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:b/\u003e\u003c/w:rPr\u003e\u003cw:t\u003ec\u003c/w:t\u003e\u003c/w:r\u003e\u003cw:r\u003e\u003cw:t\u003e of the same size and same fields as\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:b/\u003e\u003c/w:rPr\u003e\u003cw:t\u003es\u003c/w:t\u003e\u003c/w:r\u003e\u003cw:r\u003e\u003cw:t\u003e, where each field of the structure element of c stores the result of\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:b/\u003e\u003c/w:rPr\u003e\u003cw:t\u003ef\u003c/w:t\u003e\u003c/w:r\u003e\u003cw:r\u003e\u003cw:t\u003e applied to the same field of the relevant structure element in\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:b/\u003e\u003c/w:rPr\u003e\u003cw:t\u003es\u003c/w:t\u003e\u003c/w:r\u003e\u003cw:r\u003e\u003cw:t\u003e. The structfun2 must preserve the behavior of structfun for scalar structure input. That is, when\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:b/\u003e\u003c/w:rPr\u003e\u003cw:t\u003es\u003c/w:t\u003e\u003c/w:r\u003e\u003cw:r\u003e\u003cw:t\u003e is a scalar structure, your output reduces to c = structfun(f,s,'UniformOutput',false). No assumption on\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:b/\u003e\u003c/w:rPr\u003e\u003cw:t\u003ef\u003c/w:t\u003e\u003c/w:r\u003e\u003cw:r\u003e\u003cw:t\u003e is needed in this problem.\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[s = struct('f1',{1, [3 4]; 1, [5 6]},'f2',{[1 2], 2; [3 4 5], [2 5]});\\nf = @numel;\\nc = struct('f1',{1, 2; 1, 2},'f2',{2, 1; 3, 2});]]\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\u003eRelated problems in this series:\u003c/w:t\u003e\u003c/w:r\u003e\u003c/w:p\u003e\u003cw:p\u003e\u003cw:pPr\u003e\u003cw:pStyle w:val=\\\"ListParagraph\\\"/\u003e\u003cw:numPr\u003e\u003cw:numId w:val=\\\"1\\\"/\u003e\u003c/w:numPr\u003e\u003c/w:pPr\u003e\u003cw:hyperlink w:docLocation=\\\"http://www.mathworks.com/matlabcentral/cody/problems/43685-apply-function-to-each-field-of-a-structure-array-part-1\\\"\u003e\u003cw:r\u003e\u003cw:t\u003eApply Function to Each Field of a Structure Array: Part 1\u003c/w:t\u003e\u003c/w:r\u003e\u003c/w:hyperlink\u003e\u003c/w:p\u003e\u003cw:p\u003e\u003cw:pPr\u003e\u003cw:pStyle w:val=\\\"ListParagraph\\\"/\u003e\u003cw:numPr\u003e\u003cw:numId w:val=\\\"1\\\"/\u003e\u003c/w:numPr\u003e\u003c/w:pPr\u003e\u003cw:hyperlink w:docLocation=\\\"http://www.mathworks.com/matlabcentral/cody/problems/43686-apply-function-to-each-field-of-a-structure-array-part-2\\\"\u003e\u003cw:r\u003e\u003cw:t\u003eApply Function to Each Field of a Structure Array: Part 2\u003c/w:t\u003e\u003c/w:r\u003e\u003c/w:hyperlink\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":43685,"title":"Apply Function to Each Field of a Structure Array: Part 1","description":"The builtin \u003chttp://www.mathworks.com/help/matlab/ref/structfun.html?=structfun structfun\u003e applies a function handle to each field of a *scalar structure*, but it does not work for structure array. The purpose of this problem is to generalize structfun to enable support for structure array input.\r\n\r\nWrite your own function *structfun2* which accepts a structure array *s* and a function handle *f* as the inputs. The output *c = structfun2(f,s)* is a cell array of the same size as *s*, with each cell storing the result of *f* applied to every field of the relevant structure element in *s*. The structfun2 must preserve the behavior of structfun for scalar structure input. That is, structfun2(f,s) = structfun(f,s) holds for any scalar structure *s*. The assumption required is that *f* is a function that returns a scalar, regardless of the input. \r\n\r\nExample: \r\n\r\n  s = struct('f1',{1, [3 4]; 1, [5 6]},'f2',{[1 2], 2; [3 4 5], [2 5]});\r\n  f = @numel;\r\n  c = {[1;2], [2;1]; [1;3], [2;2]};\r\n\r\nRelated problems in this series:\r\n\r\n* \u003chttp://www.mathworks.com/matlabcentral/cody/problems/43686-apply-function-to-each-field-of-a-structure-array-part-2 Apply Function to Each Field of a Structure Array: Part 2\u003e\r\n* \u003chttp://www.mathworks.com/matlabcentral/cody/problems/43685-apply-function-to-each-field-of-a-structure-array-part-1 Apply Function to Each Field of a Structure Array: Part 1\u003e","description_html":"\u003cp\u003eThe builtin \u003ca href = \"http://www.mathworks.com/help/matlab/ref/structfun.html?=structfun\"\u003estructfun\u003c/a\u003e applies a function handle to each field of a \u003cb\u003escalar structure\u003c/b\u003e, but it does not work for structure array. The purpose of this problem is to generalize structfun to enable support for structure array input.\u003c/p\u003e\u003cp\u003eWrite your own function \u003cb\u003estructfun2\u003c/b\u003e which accepts a structure array \u003cb\u003es\u003c/b\u003e and a function handle \u003cb\u003ef\u003c/b\u003e as the inputs. The output \u003cb\u003ec = structfun2(f,s)\u003c/b\u003e is a cell array of the same size as \u003cb\u003es\u003c/b\u003e, with each cell storing the result of \u003cb\u003ef\u003c/b\u003e applied to every field of the relevant structure element in \u003cb\u003es\u003c/b\u003e. The structfun2 must preserve the behavior of structfun for scalar structure input. That is, structfun2(f,s) = structfun(f,s) holds for any scalar structure \u003cb\u003es\u003c/b\u003e. The assumption required is that \u003cb\u003ef\u003c/b\u003e is a function that returns a scalar, regardless of the input.\u003c/p\u003e\u003cp\u003eExample:\u003c/p\u003e\u003cpre class=\"language-matlab\"\u003es = struct('f1',{1, [3 4]; 1, [5 6]},'f2',{[1 2], 2; [3 4 5], [2 5]});\r\nf = @numel;\r\nc = {[1;2], [2;1]; [1;3], [2;2]};\r\n\u003c/pre\u003e\u003cp\u003eRelated problems in this series:\u003c/p\u003e\u003cul\u003e\u003cli\u003e\u003ca href = \"http://www.mathworks.com/matlabcentral/cody/problems/43686-apply-function-to-each-field-of-a-structure-array-part-2\"\u003eApply Function to Each Field of a Structure Array: Part 2\u003c/a\u003e\u003c/li\u003e\u003cli\u003e\u003ca href = \"http://www.mathworks.com/matlabcentral/cody/problems/43685-apply-function-to-each-field-of-a-structure-array-part-1\"\u003eApply Function to Each Field of a Structure Array: Part 1\u003c/a\u003e\u003c/li\u003e\u003c/ul\u003e","function_template":"function y = structfun2(f,s)\r\n  y = x;\r\nend","test_suite":"%%\r\ns.f1 = 'Sunday';\r\ns.f2 = 'Monday';\r\ns.f3 = 'Tuesday'; \r\ns.f4 = 'Wednesday';\r\ns.f5 = 'Thursday';\r\ns.f6 = 'Friday';\r\ns.f7 = 'Saturday';\r\nf = @numel;\r\nc = structfun(@numel, s);\r\nassert(isequal(structfun2(f,s),c))\r\n\r\n%%\r\ns = struct('f1',{1, [3 4]; 1, [5 6]},'f2',{[1 2], 2; [3 4 5], [2 5]});\r\nf = @(x)min(x(:));\r\nc = {[1;1], [3;2]; [1;3], [5;2]};\r\nassert(isequal(structfun2(f,s),c))\r\n\r\n%%\r\ns = struct('f1',{1, [3 4]; 1, [5 6]},'f2',{[1 2], 2; [3 4 5], [2 5]});\r\nf = @(x)max(x(:));\r\nc = {[1;2], [4;2]; [1;5], [6;5]};\r\nassert(isequal(structfun2(f,s),c))\r\n\r\n%%\r\ns = struct('f1',{0, [3 4]; 1, [5 7 6]},'f2',{[0 0], 2; [2 4 5], [0 5]});\r\nf = @nnz;\r\nc = {[0;0], [2;1]; [1;3], [3;1]};\r\nassert(isequal(structfun2(f,s),c))\r\n","published":true,"deleted":false,"likes_count":1,"comments_count":0,"created_by":12569,"edited_by":null,"edited_at":null,"deleted_by":null,"deleted_at":null,"solvers_count":32,"test_suite_updated_at":"2016-12-01T22:39:09.000Z","rescore_all_solutions":false,"group_id":1,"created_at":"2016-11-27T01:04:06.000Z","updated_at":"2026-04-08T13:59:11.000Z","published_at":"2016-11-27T01:32:39.000Z","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\u003eThe builtin\u003c/w:t\u003e\u003c/w:r\u003e\u003cw:r\u003e\u003cw:t\u003e \u003c/w:t\u003e\u003c/w:r\u003e\u003cw:hyperlink w:docLocation=\\\"http://www.mathworks.com/help/matlab/ref/structfun.html?=structfun\\\"\u003e\u003cw:r\u003e\u003cw:t\u003estructfun\u003c/w:t\u003e\u003c/w:r\u003e\u003c/w:hyperlink\u003e\u003cw:r\u003e\u003cw:t\u003e applies a function handle to each field of a\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:b/\u003e\u003c/w:rPr\u003e\u003cw:t\u003escalar structure\u003c/w:t\u003e\u003c/w:r\u003e\u003cw:r\u003e\u003cw:t\u003e, but it does not work for structure array. The purpose of this problem is to generalize structfun to enable support for structure array input.\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\u003eWrite your own 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:b/\u003e\u003c/w:rPr\u003e\u003cw:t\u003estructfun2\u003c/w:t\u003e\u003c/w:r\u003e\u003cw:r\u003e\u003cw:t\u003e which accepts a structure array\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:b/\u003e\u003c/w:rPr\u003e\u003cw:t\u003es\u003c/w:t\u003e\u003c/w:r\u003e\u003cw:r\u003e\u003cw:t\u003e and a function handle\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:b/\u003e\u003c/w:rPr\u003e\u003cw:t\u003ef\u003c/w:t\u003e\u003c/w:r\u003e\u003cw:r\u003e\u003cw:t\u003e as the inputs. The output\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:b/\u003e\u003c/w:rPr\u003e\u003cw:t\u003ec = structfun2(f,s)\u003c/w:t\u003e\u003c/w:r\u003e\u003cw:r\u003e\u003cw:t\u003e is a cell array of the same size as\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:b/\u003e\u003c/w:rPr\u003e\u003cw:t\u003es\u003c/w:t\u003e\u003c/w:r\u003e\u003cw:r\u003e\u003cw:t\u003e, with each cell storing the result of\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:b/\u003e\u003c/w:rPr\u003e\u003cw:t\u003ef\u003c/w:t\u003e\u003c/w:r\u003e\u003cw:r\u003e\u003cw:t\u003e applied to every field of the relevant structure element in\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:b/\u003e\u003c/w:rPr\u003e\u003cw:t\u003es\u003c/w:t\u003e\u003c/w:r\u003e\u003cw:r\u003e\u003cw:t\u003e. The structfun2 must preserve the behavior of structfun for scalar structure input. That is, structfun2(f,s) = structfun(f,s) holds for any scalar structure\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:b/\u003e\u003c/w:rPr\u003e\u003cw:t\u003es\u003c/w:t\u003e\u003c/w:r\u003e\u003cw:r\u003e\u003cw:t\u003e. The assumption required is that\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:b/\u003e\u003c/w:rPr\u003e\u003cw:t\u003ef\u003c/w:t\u003e\u003c/w:r\u003e\u003cw:r\u003e\u003cw:t\u003e is a function that returns a scalar, regardless of the input.\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[s = struct('f1',{1, [3 4]; 1, [5 6]},'f2',{[1 2], 2; [3 4 5], [2 5]});\\nf = @numel;\\nc = {[1;2], [2;1]; [1;3], [2;2]};]]\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\u003eRelated problems in this series:\u003c/w:t\u003e\u003c/w:r\u003e\u003c/w:p\u003e\u003cw:p\u003e\u003cw:pPr\u003e\u003cw:pStyle w:val=\\\"ListParagraph\\\"/\u003e\u003cw:numPr\u003e\u003cw:numId w:val=\\\"1\\\"/\u003e\u003c/w:numPr\u003e\u003c/w:pPr\u003e\u003cw:hyperlink w:docLocation=\\\"http://www.mathworks.com/matlabcentral/cody/problems/43686-apply-function-to-each-field-of-a-structure-array-part-2\\\"\u003e\u003cw:r\u003e\u003cw:t\u003eApply Function to Each Field of a Structure Array: Part 2\u003c/w:t\u003e\u003c/w:r\u003e\u003c/w:hyperlink\u003e\u003c/w:p\u003e\u003cw:p\u003e\u003cw:pPr\u003e\u003cw:pStyle w:val=\\\"ListParagraph\\\"/\u003e\u003cw:numPr\u003e\u003cw:numId w:val=\\\"1\\\"/\u003e\u003c/w:numPr\u003e\u003c/w:pPr\u003e\u003cw:hyperlink w:docLocation=\\\"http://www.mathworks.com/matlabcentral/cody/problems/43685-apply-function-to-each-field-of-a-structure-array-part-1\\\"\u003e\u003cw:r\u003e\u003cw:t\u003eApply Function to Each Field of a Structure Array: Part 1\u003c/w:t\u003e\u003c/w:r\u003e\u003c/w:hyperlink\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":43686,"title":"Apply Function to Each Field of a Structure Array: Part 2","description":"The builtin \u003chttp://www.mathworks.com/help/matlab/ref/structfun.html?=structfun structfun\u003e applies a function handle to each field of a *scalar structure*, but it does not work for structure array. The purpose of this problem is to generalize structfun to enable support for structure array input.\r\n\r\nWrite your own function *structfun2* which accepts a structure array *s* and a function handle *f* as the inputs. The output *c = structfun2(f,s)* is a structure array *c* of the same size and same fields as *s*, where each field of the structure element of c stores the result of *f* applied to the same field of the relevant structure element in *s*. The structfun2 must preserve the behavior of structfun for scalar structure input. That is, when *s* is a scalar structure, your output reduces to c = structfun(f,s,'UniformOutput',false). No assumption on *f* is needed in this problem. \r\n \r\n\r\nExample: \r\n\r\n  s = struct('f1',{1, [3 4]; 1, [5 6]},'f2',{[1 2], 2; [3 4 5], [2 5]});\r\n  f = @numel;\r\n  c = struct('f1',{1, 2; 1, 2},'f2',{2, 1; 3, 2});\r\n\r\nRelated problems in this series:\r\n\r\n* \u003chttp://www.mathworks.com/matlabcentral/cody/problems/43685-apply-function-to-each-field-of-a-structure-array-part-1 Apply Function to Each Field of a Structure Array: Part 1\u003e\r\n* \u003chttp://www.mathworks.com/matlabcentral/cody/problems/43686-apply-function-to-each-field-of-a-structure-array-part-2 Apply Function to Each Field of a Structure Array: Part 2\u003e\r\n","description_html":"\u003cp\u003eThe builtin \u003ca href = \"http://www.mathworks.com/help/matlab/ref/structfun.html?=structfun\"\u003estructfun\u003c/a\u003e applies a function handle to each field of a \u003cb\u003escalar structure\u003c/b\u003e, but it does not work for structure array. The purpose of this problem is to generalize structfun to enable support for structure array input.\u003c/p\u003e\u003cp\u003eWrite your own function \u003cb\u003estructfun2\u003c/b\u003e which accepts a structure array \u003cb\u003es\u003c/b\u003e and a function handle \u003cb\u003ef\u003c/b\u003e as the inputs. The output \u003cb\u003ec = structfun2(f,s)\u003c/b\u003e is a structure array \u003cb\u003ec\u003c/b\u003e of the same size and same fields as \u003cb\u003es\u003c/b\u003e, where each field of the structure element of c stores the result of \u003cb\u003ef\u003c/b\u003e applied to the same field of the relevant structure element in \u003cb\u003es\u003c/b\u003e. The structfun2 must preserve the behavior of structfun for scalar structure input. That is, when \u003cb\u003es\u003c/b\u003e is a scalar structure, your output reduces to c = structfun(f,s,'UniformOutput',false). No assumption on \u003cb\u003ef\u003c/b\u003e is needed in this problem.\u003c/p\u003e\u003cp\u003eExample:\u003c/p\u003e\u003cpre class=\"language-matlab\"\u003es = struct('f1',{1, [3 4]; 1, [5 6]},'f2',{[1 2], 2; [3 4 5], [2 5]});\r\nf = @numel;\r\nc = struct('f1',{1, 2; 1, 2},'f2',{2, 1; 3, 2});\r\n\u003c/pre\u003e\u003cp\u003eRelated problems in this series:\u003c/p\u003e\u003cul\u003e\u003cli\u003e\u003ca href = \"http://www.mathworks.com/matlabcentral/cody/problems/43685-apply-function-to-each-field-of-a-structure-array-part-1\"\u003eApply Function to Each Field of a Structure Array: Part 1\u003c/a\u003e\u003c/li\u003e\u003cli\u003e\u003ca href = \"http://www.mathworks.com/matlabcentral/cody/problems/43686-apply-function-to-each-field-of-a-structure-array-part-2\"\u003eApply Function to Each Field of a Structure Array: Part 2\u003c/a\u003e\u003c/li\u003e\u003c/ul\u003e","function_template":"function y = structfun2(f,s)\r\n  y = s;\r\nend","test_suite":"%%\r\ns.f1 = 'Sunday';\r\ns.f2 = 'Monday';\r\ns.f3 = 'Tuesday'; \r\ns.f4 = 'Wednesday';\r\ns.f5 = 'Thursday';\r\ns.f6 = 'Friday';\r\ns.f7 = 'Saturday';\r\nf = @(x)x(1:3);\r\nc = structfun(f,s,'UniformOutput',false);\r\nassert(isequal(structfun2(f,s),c))\r\n\r\n%%\r\ns = struct('f1',{1, [3 4;5 6]; 1, [5 6;7 8]},'f2',{[1 2], 2; [3 4 5;6 7 8], [2 6;4 5]});\r\nf = @min;\r\nc = struct('f1',{1, [3 4]; 1, [5 6]},'f2',{1, 2; [3 4 5], [2 5]});\r\nassert(isequal(structfun2(f,s),c))\r\n\r\n%%\r\ns = struct('f1',{1, [3 4;5 6]; 1, [5 6;7 8]},'f2',{[1 2], 2; [3 4 5;6 7 8], [2 6;4 5]});\r\nf = @sum;\r\nc = struct('f1',{1, [8 10]; 1, [12 14]},'f2',{3, 2; [9 11 13], [6 11]});\r\nassert(isequal(structfun2(f,s),c))\r\n\r\n%%\r\ns = struct('f1',{1, [3 4;5 6]; 1, [5 6;7 8]},'f2',{[1 2], 2; [3 4 5;6 7 8], [2 6;4 5]});\r\nf = @pow2;\r\nc = struct('f1',{2, [8 16;32 64]; 2, [32 64;128 256]},'f2',{[2 4], 4; [8 16 32;64 128 256], [4 64;16 32]});\r\nassert(isequal(structfun2(f,s),c))\r\n","published":true,"deleted":false,"likes_count":1,"comments_count":1,"created_by":12569,"edited_by":null,"edited_at":null,"deleted_by":null,"deleted_at":null,"solvers_count":25,"test_suite_updated_at":"2016-12-01T22:27:07.000Z","rescore_all_solutions":false,"group_id":1,"created_at":"2016-11-27T02:12:26.000Z","updated_at":"2026-04-08T14:13:31.000Z","published_at":"2016-11-27T02:12:31.000Z","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\u003eThe builtin\u003c/w:t\u003e\u003c/w:r\u003e\u003cw:r\u003e\u003cw:t\u003e \u003c/w:t\u003e\u003c/w:r\u003e\u003cw:hyperlink w:docLocation=\\\"http://www.mathworks.com/help/matlab/ref/structfun.html?=structfun\\\"\u003e\u003cw:r\u003e\u003cw:t\u003estructfun\u003c/w:t\u003e\u003c/w:r\u003e\u003c/w:hyperlink\u003e\u003cw:r\u003e\u003cw:t\u003e applies a function handle to each field of a\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:b/\u003e\u003c/w:rPr\u003e\u003cw:t\u003escalar structure\u003c/w:t\u003e\u003c/w:r\u003e\u003cw:r\u003e\u003cw:t\u003e, but it does not work for structure array. The purpose of this problem is to generalize structfun to enable support for structure array input.\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\u003eWrite your own 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:b/\u003e\u003c/w:rPr\u003e\u003cw:t\u003estructfun2\u003c/w:t\u003e\u003c/w:r\u003e\u003cw:r\u003e\u003cw:t\u003e which accepts a structure array\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:b/\u003e\u003c/w:rPr\u003e\u003cw:t\u003es\u003c/w:t\u003e\u003c/w:r\u003e\u003cw:r\u003e\u003cw:t\u003e and a function handle\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:b/\u003e\u003c/w:rPr\u003e\u003cw:t\u003ef\u003c/w:t\u003e\u003c/w:r\u003e\u003cw:r\u003e\u003cw:t\u003e as the inputs. The output\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:b/\u003e\u003c/w:rPr\u003e\u003cw:t\u003ec = structfun2(f,s)\u003c/w:t\u003e\u003c/w:r\u003e\u003cw:r\u003e\u003cw:t\u003e is a structure array\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:b/\u003e\u003c/w:rPr\u003e\u003cw:t\u003ec\u003c/w:t\u003e\u003c/w:r\u003e\u003cw:r\u003e\u003cw:t\u003e of the same size and same fields as\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:b/\u003e\u003c/w:rPr\u003e\u003cw:t\u003es\u003c/w:t\u003e\u003c/w:r\u003e\u003cw:r\u003e\u003cw:t\u003e, where each field of the structure element of c stores the result of\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:b/\u003e\u003c/w:rPr\u003e\u003cw:t\u003ef\u003c/w:t\u003e\u003c/w:r\u003e\u003cw:r\u003e\u003cw:t\u003e applied to the same field of the relevant structure element in\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:b/\u003e\u003c/w:rPr\u003e\u003cw:t\u003es\u003c/w:t\u003e\u003c/w:r\u003e\u003cw:r\u003e\u003cw:t\u003e. The structfun2 must preserve the behavior of structfun for scalar structure input. That is, when\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:b/\u003e\u003c/w:rPr\u003e\u003cw:t\u003es\u003c/w:t\u003e\u003c/w:r\u003e\u003cw:r\u003e\u003cw:t\u003e is a scalar structure, your output reduces to c = structfun(f,s,'UniformOutput',false). No assumption on\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:b/\u003e\u003c/w:rPr\u003e\u003cw:t\u003ef\u003c/w:t\u003e\u003c/w:r\u003e\u003cw:r\u003e\u003cw:t\u003e is needed in this problem.\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[s = struct('f1',{1, [3 4]; 1, [5 6]},'f2',{[1 2], 2; [3 4 5], [2 5]});\\nf = @numel;\\nc = struct('f1',{1, 2; 1, 2},'f2',{2, 1; 3, 2});]]\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\u003eRelated problems in this 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