Find the index of nonempty array in a structure for a particular field

Hi I have a structure with one field e.g. select(i).c, where i=1,...,N. I want to find the index i for which select(i).c is nonempty. How can I do it ? Thanks

[Cedric]

select is a struct array actually. Do you need the index of the non-empty content or would the content be enough? And what is the type/class of what is stored in field c?

Answer 1

[Andrei Bobrov]

find(~cellfun(@isempty,{select.c}))

[Ali A. Ghafari]

thanks

Answer 2

[Jos (10584)]

use ARRAYFUN

% create some data
for j=1:10, select(j).c = repmat(j,round(rand(1))) ; end
% engine
tf = arrayfun(@(k) ~isempty(select(k).c), 1:numel(select))
idx = find(tf)