Matrix properties
number of rows	67
number of columns	67
nonzeros	294
structural full rank?	yes
structural rank	67
# of blocks from dmperm	2
# strongly connected comp.	1
explicit zero entries	0
nonzero pattern symmetry	3%
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	997
Cholesky flop count	1.9e+04
nnz(L+U), no partial pivoting, with AMD	1,927
nnz(V) for QR, upper bound nnz(L) for LU, with COLAMD	460
nnz(R) for QR, upper bound nnz(U) for LU, with COLAMD	905

SVD-based statistics:
norm(A)	4.06071
min(svd(A))	0.0311841
cond(A)	130.217
rank(A)	67
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.