function count_zeros(M)
% Counts the number of zero and non-zero elements in a matrix M.
%
% To use this function type `count_zeros(M)` where M is a matrix.

n = size(M,1);
m = size(M,2);
zeros = 0;
nonzeros = 0;

for i = 1:n
    for j = 1:m
        if (M(i,j) == 0)
            zeros = zeros + 1;
        else
            nonzeros = nonzeros + 1;
        end
    end
end

zeros = zeros
nonzeros = nonzeros