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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.

Extended Capabilities

C/C++ Code Generation
Generate C and C++ code using MATLAB® Coder™.

See Also

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Introduced before R2006a

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