Matrix properties
number of rows	989
number of columns	989
nonzeros	3,518
structural full rank?	yes
structural rank	989
# of blocks from dmperm	270
# strongly connected comp.	2
explicit zero entries	19
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	38,100
Cholesky flop count	4.3e+06
nnz(L+U), no partial pivoting, with AMD	75,211
nnz(V) for QR, upper bound nnz(L) for LU, with COLAMD	3,614
nnz(R) for QR, upper bound nnz(U) for LU, with COLAMD	9,236

Note that all matrix statistics (except nonzero pattern symmetry) exclude the 19 explicit zero entries.

SVD-based statistics:
norm(A)	319127
min(svd(A))	3.23645e-07
cond(A)	9.86043e+11
rank(A)	989
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.