Accessing field names in struct
显示 更早的评论
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?
采纳的回答
Walter Roberson
2020-1-29
F = fieldnames(test) ;
F(cell2mat(struct2cell(test)))
更多回答（1 个）
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)}
1 个评论
Timing tests:
test = struct(...
'a',false,...
'b',false,...
'c',false,...
'd',false,...
'e',false,...
'f',false,...
'g',true...
);
timeit(@()f1(test))
timeit(@()f2(test))
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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