nnz

Number of non-zero elements.

Syntax

n = nnz(X)

Description

Returns the count of structurally non-zero elements in X. For sparse matrices, this is the count of stored entries (which may include explicit zeros if any were inserted). For full matrices, it counts elements that are not exactly zero.

Examples

nnz(speye(100))          % 100
nnz([1 0 2 0 3 0])       % 3
nnz(zeros(5))            % 0

See also

• nzmax — Storage allocated for non-zero elements.
• nonzeros — Column vector of non-zero elements.