How can I copy a Matlab array to a field of an array of structs

Question

I have defined an array of structs as follows:

t3(1:num_elems) = struct('prime_idx',0,'second_idx',0,);

I would like to copy an array nic to the prime_idx field of t3, so that t3(x).prime_idx == nic(x) for all x. I've tried:

 t3.prime_idx = nic;

and [t3.prime_idx] = nic; and t3.prime_idx = [nic]; and [t3.prime_idx] = [nic];

and various permutations of adding (:) after the two array variables t3 and nic.

How can I copy each element of nic to the corresponding prime_idx field of the corresponding element of t3?

Javier Martín · Accepted Answer · 2015-12-24 18:42:52Z

1

The expression s.f, where s is a struct array, results in a comma separated list. Thus, writing s.f = x; is invalid, and [s.f] = x; would work, but requires x to return as many outputs as s has items. What you need is to provide those outputs, e.g. like this:

cNic = num2cell(nic);
[t3.prime_idx] = cNic{:};

answered Dec 24, 2015 at 18:42

Javier Martín

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