How to slice a struct array?

Question

How can I extract a specific field from each element of a Matlab struct array?

>> clear x
>> x(1).a = 6;
>> x(2).a = 7;

I'd like an array containing 6 and 7. Neither x(:).a nor x.a do what I want.

>> x(:).a

ans =    

     6


ans =

     7

Answer 1

No problem - just use :

arr = [x.a];

It will concat all of the values that you need. If you have a more complex data, you can use the curly bracers:

b(1).x = 'John';
b(2).x = 'Doe';
arr = {b.x};