nz = nnz(X)
nz = nnz(X)
is the number of nonzeros in matrix X
.
The density of a sparse matrix, which is printed by the whos
command, is nnz(X)/prod(size(X))
.
is a tridiagonal matrix with 20 nonzeros on each of three diagonals, sow
=
sparse(wilkinson(21));
nnz(w) = 60
.
find
,issparse
,nonzeros
,nzmax
,size
,whos
(c) Copyright 1994 by The MathWorks, Inc.