nnz

Return the number of nonzero elements.

Syntax

• v = nnz(M)

Input argument

• M - a matrix: double or logical, sparse or not.

Output argument

• v - a integer value.

Description

nnz returns the number of non zero elements in an matrix.

Example

I = [1 2 3];
J = [3 1 2];
V = [32 42 53];
sp = sparse(I, J, V, 5, 4, 10)
size(sp)
nnz(sp)
nzmax(sp)

See also

sparse, nzmax.

History

Author

Allan CORNET