MATLAB: Suggestions for a non-zero counter

Question

I have a 16000X271 matrix, and its mostly zeros, with maybe 1000 non-zero numbers. I need to find out how many non-zero elements there are. The way i can think of is going through every variable and check if it is a zero or not, but that would be very inefficient, is there a faster way? Thanks

Answer 1

well

how about nnz (number non-zeros)!

doc nnz;

or

sum(sum(logical(A));