Access automatically substructures from loop

Good morning everybody, I hope everything is good for you,

I am working with large structures and I want to automatize some tasks. If we take the structure that I attached to this message, how do I select the nth matrix of the structure ? Without writing "Example.hello" ?

I would like to do the same as when we take the value of a matrix in the nth position ( matrix(n)).

Have a nice day

[Stephen23]

Note that field order is NOT fixed and can change. Code that assumes that fields are in a particular order will be fragile.

As Steven Lord wrote, most likely you would be much better off using dynamic fieldnames:

Answer 1

[Steven Lord]

Rather than depending on the order in which the fields of the struct array are displayed (which can change -- in the following example s and snew contain the same data just in a different order)

s = struct('b',2,'c',3,'a',1)
snew = orderfields(s)

I would use dynamic field names, potentially in conjunction with the fieldnames function, or maybe (if you want to iterate through all the fields of the struct) structfun.

fn = 'b';
b1 = s.(fn)
b2 = snew.(fn)
sSquared = structfun(@(x) x.^2, s)

[V.D-C]

Thank you for your answer, I will continue in this new direction !