Matrix properties
number of rows	497
number of columns	497
nonzeros	1,721
structural full rank?	yes
structural rank	497
# of blocks from dmperm	294
# strongly connected comp.	2
explicit zero entries	6
nonzero pattern symmetry	1%
numeric value symmetry	0%
type	real
structure	unsymmetric
Cholesky candidate?	no
positive definite?	no

author	A. Westerberg
editor	I. Duff, R. Grimes, J. Lewis
date	1983
kind	chemical process simulation problem
2D/3D problem?	no

Ordering statistics:	result
nnz(chol(P*(A+A'+s*I)*P')) with AMD	7,671
Cholesky flop count	2.6e+05
nnz(L+U), no partial pivoting, with AMD	14,845
nnz(V) for QR, upper bound nnz(L) for LU, with COLAMD	1,965
nnz(R) for QR, upper bound nnz(U) for LU, with COLAMD	6,758

Note that all matrix statistics (except nonzero pattern symmetry) exclude the 6 explicit zero entries.

SVD-based statistics:
norm(A)	689849
min(svd(A))	1.49299e-06
cond(A)	4.62057e+11
rank(A)	497
sprank(A)-rank(A)	0
null space dimension	0
full numerical rank?	yes

singular values (MAT file):	click here
SVD method used:	s = svd (full (A)) ;
status:	ok

For a description of the statistics displayed above, click here.

Maintained by Tim Davis, last updated 12-Mar-2014.
Matrix pictures by cspy, a MATLAB function in the CSparse package.
Matrix graphs by Yifan Hu, AT&T Labs Visualization Group.