Find the first N non-zero elements in each row of a matrix

Question

I have a matrix in MATLAB with zeroes and I would like to get another matrix with the first N non-zero elements in each row. Let\'s say for example N = 3<

Answer 1

One-liner solution:

B = cell2mat(cellfun(@(c) c(1:N), arrayfun(@(k) nonzeros(A(k,:)), 1:size(A,1), 'uni', false), 'uni', false)).'

Not terribly elegant or efficient, but so much fun!