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Number of nonzero matrix elements


n = nnz(X)


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

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


The matrix

 w = sparse(wilkinson(21));

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

More About

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Tall Array Support

This function fully supports tall arrays. For more information, see Tall Arrays.

See Also

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Introduced before R2006a

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