How to copy field contents of one struct to another?

Question

Ralf 2015-7-13

编辑： Guillaume 2015-7-13

Hi all,

I have got two structs, A and B. B has a subset of the fields of A:

A.f1 = 1;
A.f2 = 2;
A.f3 = 3;
B.f1 = 4;
B.f2 = 5;

Now I want to copy all field content of B to the corresponding fields of struct A, leaving the other fields of A unchanged:

A.f1 = B.f1;
A.f2 = B.f2;
% A.f3 == 3 untouched

Is there a simply way to achieve this for arbitraty structs A and B, considering that B's field names are always a subset of A's field names?

Thank you very much, Ralf

Answer 1

Guillaume 2015-7-13

编辑：Guillaume 2015-7-13

Iterate over the fieldnames of B to copy them using dynamic field names:

A = struct('f1', 1, 'f2', 2, 'f3', 3);
B = struct('f1', 4, 'f2', 5);
for fn = fieldnames(B)'
   A.(fn{1}) = B.(fn{1});
end