How to call a certain part of a matrix which is a value of a field of a structure?

What I want to do is to access the first column and then the second column of a 5-by-7 matrix which is the value of a field named B. B is the third field of struct A. How can I do it dynamically best?

Answer 1

[Guillaume]

Your description is really not clear. An example would help.

Get 2nd and 3rd column of matrix stored in field 'B' of structure A, regardless of the order of fields:

A.B(:, [2 3])

Get 2nd and 3rd column of matrix stored in the 3rd field of structure A, regardless of the names of the fields

fn = fieldnames(A);
A.(fn{3})(:, [2 3])