Question

I have a matrix of structs. I’m trying to extract from that matrix a matrix the same size
with only one of the fields as values.

I’ve been trying to use struct2cell and similar functions without success.
How can this be done?

Answer 1

If I understand you correctly, you have an array of struct like e.g this

s(1:2,1:3) = struct('a',1,'b',2);

Now you want a different struct that only has the field b

[newS(1:2,1:3).b] = deal(s.b);

edit

If all you need is the output (and if the field values are scalar), you can do the following:

out = zeros(size(s));
out(:) = cat(1,s.b)