Accessing field names in struct

4 次查看（过去 30 天）
Deepa Maheshvare
Deepa Maheshvare 2020-1-29
评论： Stephen23 2022-12-23
I've the following struct
test = struct(...
'a',false,...
'b',false,...
'c',false,...
'd',false,...
'e',false,...
'f',false,...
'g',true...
);
How do get the field name that has a value true ?
Expected result:
g
Any suggestions?

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采纳的回答

Walter Roberson
Walter Roberson 2020-1-29
F = fieldnames(test) ;
F(cell2mat(struct2cell(test)))

更多回答（1 个）

Stephen23
Stephen23 2022-12-23
Ran in:
test = struct(...
'a',false,...
'b',false,...
'c',false,...
'd',false,...
'e',false,...
'f',false,...
'g',true...
);
F = fieldnames(test);
R = F{structfun(@(a)a,test)}
R = 'g'
  1 个评论
Stephen23
Stephen23 2022-12-23
Ran in:
Timing tests:
test = struct(...
'a',false,...
'b',false,...
'c',false,...
'd',false,...
'e',false,...
'f',false,...
'g',true...
);
timeit(@()f1(test))
ans = 6.6802e-05
timeit(@()f2(test))
ans = 2.1892e-05
function f1(test)
F = fieldnames(test);
R = F(cell2mat(struct2cell(test)));
end
function f2(test)
F = fieldnames(test);
R = F{structfun(@(a)a,test)};
end

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