Is it possible to check for existence of fields in nested structures with isfield in MATLAB 8.1 (R2013a)?

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I have the following structure
a.b.c = 1;
I know it is possible to search for the nested
isfield(a.b,'c')
But I would like to check for the existence of the field 'c' even when I am not sure that the field 'b' exists, e.g.
isfield(a,'b.c');

採用された回答

MathWorks Support Team
MathWorks Support Team 2013 年 10 月 25 日
There is no MATLAB function to determine the existence of fields in nested structures. The only workaround is to check separately for the existence of 'b' and of 'c':
isfield(a, 'b') && isfield(a.b, 'c')

その他の回答 (1 件)

Steven Lord
Steven Lord 2022 年 12 月 16 日
Another approach that uses neither eval nor repeated calls to isfield is to use getfield.
a.b.c = 1;
isNestedField(a, 'b.c')
ans = logical
1
isNestedField(a, 'b.d')
ans = logical
0
isNestedField(1:10, 'a')
ans = logical
0
function tf = isNestedField(s, thefields)
fieldlist = split(thefields, '.');
try
getfield(s, fieldlist{:});
tf = true;
catch
tf = false;
end
end

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