MATLAB Function Reference |
Number of nonzero matrix elements
Syntax
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
is a tridiagonal matrix with 20
nonzeros on each of three diagonals, so nnz(w) = 60
.
See Also
find
, isa
, nonzeros
, nzmax
, size
, whos
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