Section: Sparse Matrix Support
y = nnz(x)
This function returns the number of nonzero elements in a matrix or array. This function works for both sparse and non-sparse arrays. For
--> a = [1,0,0,5;0,3,2,0] a = 1 0 0 5 0 3 2 0 --> nnz(a) ans = 4 --> A = sparse(a) A = Matrix is sparse with 4 nonzeros --> nnz(A) ans = 4 --> quit