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

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MathWorks Support Team
回答： Steven Lord 2022-12-16
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');

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采纳的回答

MathWorks Support Team
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')

更多回答（1 个）

Steven Lord
Steven Lord 2022-12-16
Ran in:
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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