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Number of nonzero matrix elements
Syntax
n=nnz(X)
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 w = sparse(wilkinson(21));
20 nonzeros on each of three diagonals, so nnz(w) = 60.
See Also
find, isa, nonzeros, nzmax, size, whos