Assigning an Array to Structure Field

Question

Nick G 2015-9-1

回答： Walter Roberson 2015-9-1

I'm having trouble assigning an array to a structure field.

shuff = randperm(length(unshuff));
[unshuff.trial] = shuff;

I get the following error message:

Too many output arguments.

Any ideas?

Answer 1

Walter Roberson 2015-9-1

If unshuff is an existing structure array, then

unshuff.trial

would expand to multiple locations as if you had written

[unshuff(1).trial, unshuff(2).trial, ... unshuff(end).trial] = shuff;

but your shuff is only a single output.

If you want to assign the same value to each of the locations, use

[unshuff.trial] = deal(shuff);

If you want to assign one of the values in shuff to each of the outputs then:

shuff = num2cell(randperm(length(unshuff)));
[unshuff.trial] = shuff{:};     %or deal(shuff{:})