Matrix properties
number of rows	1,505
number of columns	1,505
nonzeros	5,414
structural full rank?	yes
structural rank	1,505
# of blocks from dmperm	405
# strongly connected comp.	1
explicit zero entries	31
nonzero pattern symmetry	0%
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	93,335
Cholesky flop count	1.9e+07
nnz(L+U), no partial pivoting, with AMD	185,165
nnz(V) for QR, upper bound nnz(L) for LU, with COLAMD	6,135
nnz(R) for QR, upper bound nnz(U) for LU, with COLAMD	15,116

Note that all matrix statistics (except nonzero pattern symmetry) exclude the 31 explicit zero entries.

SVD-based statistics:
norm(A)	319128
min(svd(A))	2.0033e-07
cond(A)	1.59301e+12
rank(A)	1,505
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.