MATLAB: How to know if exist an field into a struct

existstruct

I want a funtion which give me "0" if dosen't exist a field into a struct and "1" if it exist, something like that:

s=struct("field1",val1,"field2",val2,"field3",val3);
exist(s.field1)
=1
exist(s.field5)
=0

Best Answer

Take a look at isfield.

Related Solutions

MATLAB: How to remove empty struct fields [ ] from a group a struct fields

Does this do what you want?

% create a structure with empty fields
S.A = 'x' ; S.B = [] ; S.C  = 1:5 ;
fn = fieldnames(S)
tf = cellfun(@(c) isempty(S.(c)), fn)
S2 = rmfield(S, fn(tf))

MATLAB: Exist function returning 0 for a variable that definitely exists

Don't use exist() with struct field syntax. Only use it for variable names. E.g.,

>> a.f = 4
a = 
    f: 4
>> exist('a','var')
ans =
     1
>> exist('a.f','var')
ans =
     0
>> exist('a','var') && isfield(a,'f')
ans =
     1

Best Answer

Related Solutions

MATLAB: How to remove empty struct fields [ ] from a group a struct fields

MATLAB: Exist function returning 0 for a variable that definitely exists

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