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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)).
w = sparse(wilkinson(21));
is a tridiagonal matrix with 20 nonzeros
on each of three diagonals, so nnz(w) = 60.
find | isa | nonzeros | nzmax | size | whos
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