Alternative to 'ismember' for structures

Hello! I have a structure, which I need to update at every step. However, I would like to include the update only if it has not been stored yet. This would be quite easy with a list and ismember. However, ismember does not work with structures. Has anyone got any suggestions? Thank you!

As an example, for greater clarity, consider the following problem:

A.a = 1;
A.b = 2;
A(2).a = 2;
A(2).b = 3;
A(3).a = 3;
A(3).b = 4;
B.a = 2;
B.b = 3;

Now, it is clear that B is contained within A (line 2, or B=A(2)).

If they were lists, I would use the command:

ismember(B,A,'rows);

What can I do if I would like to keep them as structures? Thank you!

Answer 1

[Adam]

any( arrayfun( @(x) isequal( B, x ), A ) )

should do the job I think.

[Enrico Anderlini]

It does exactly what I need it to do. Thanks!

Answer 2

[Azzi Abdelmalek]

You can compare

ismember([B.a],[A.a])
ismember([B.b],[A.b])

[Enrico Anderlini]

Thank you! Your answer works too and it employs ismember. However, the other answer is more compact and results in a single boolean, which is what I needed to start with.