First assign to the variable an array that is of the right class and is the maximum size that could possibly be encountered. For example,
indx = zeros(numel(mat),1);
You need to use numel of mat because of the possibility that all of the elements in mat are the same value so your find() might return every index.
Then you can do
indx = find(mat(:) == max(mat(:)));
The result might well be shorter than the size you originally allocated, and that is okay: you can reassign a matrix as shorter but not as longer.
However, I am concerned because it looks to me as if
nominees={acceptedB{indx,:}}
is indefinite size. Would
nominees = acceptedB(index,:);
be acceptable instead?
