Matrix properties
number of rows	167
number of columns	167
nonzeros	506
structural full rank?	yes
structural rank	167
# of blocks from dmperm	91
# strongly connected comp.	1
explicit zero entries	1
nonzero pattern symmetry	2%
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	2,039
Cholesky flop count	3.6e+04
nnz(L+U), no partial pivoting, with AMD	3,911
nnz(V) for QR, upper bound nnz(L) for LU, with COLAMD	470
nnz(R) for QR, upper bound nnz(U) for LU, with COLAMD	1,049

Note that all matrix statistics (except nonzero pattern symmetry) exclude the 1 explicit zero entries.

SVD-based statistics:
norm(A)	320116
min(svd(A))	6.68968e-06
cond(A)	4.78522e+10
rank(A)	167
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.