Find the index of the last non-zero element in each row of a given matrix?

Question

For an arbitrary sized matrix x, how do I find the index of the last non-zero element in each row of a given matrix?

For example, for the matrix

Answer 1

One-line solution with bsxfun:

result = max(bsxfun(@times, x~=0, 1:size(x,2)).');

Or use the two outputs of max:

[val, result] = max(fliplr(x~=0).',[],1); %'
result = (size(A,2)+1-result).*val;