nnz

Return the number of nonzero elements.

📝Syntax

v = nnz(M)

📥Input Arguments

Parameter	Description
M	numeric, logical, or character array, sparse or full.

📤Output Arguments

Parameter	Description
v	a integer value.

📄Description

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

Dense inputs can be multidimensional. Sparse inputs are 2-D and may store double, single, logical, complex double, or complex single values.

For sparse matrices, nnz counts only values that are actually nonzero. Stored zero values are ignored.

💡Examples

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)

S = sparse([1 2 1 2], [1 1 2 2], single([0 -0 complex(0, 0) complex(0, 2)]), 2, 2, 4);
n = nnz(S)

🔗See Also

🕔Version History

Version	Description
2.0.0	documented sparse single and stored zero behavior
1.0.0	initial version