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Number of nonzero matrix elements

Syntax

Description

n = nnz(X) returns the number of nonzero elements in matrix X.

The density of a sparse matrix is nnz(X)/prod(size(X)).

Examples

The matrix

is a tridiagonal matrix with 20 nonzeros on each of three diagonals, so
nnz(w) = 60.

See Also

find        Find indices and values of nonzero elements

nonzeros    Nonzero matrix elements

nzmax       Amount of storage allocated for nonzero matrix elements

size        Array dimensions

whos        List directory of variables in memory

isa         Detect an object of a given class



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