nzmax
Amount of storage allocated for nonzero matrix elements
Syntax
n = nzmax(S)
Description
n = nzmax(S)
returns the
amount of storage allocated for nonzero elements in sparse matrix S
.
For sparse matrices, nzmax(S) >= 1
.
If
S
is a full matrix, thennzmax(S)
is equal toprod(size(S))
.
Often, nnz(S)
and nzmax(S)
are
the same. But if S
is created by an operation which
produces fill-in matrix elements, such as sparse matrix multiplication
or sparse LU factorization, then more storage might be allocated than
is actually required, and nzmax(S)
reflects this.
Alternatively, sparse(i,j,s,m,n,nzmax)
or its simpler
form, spalloc(m,n,nzmax)
, can set nzmax
in
anticipation of later fill-in.
Extended Capabilities
Version History
Introduced before R2006a