Matrix properties
number of rows	479
number of columns	479
nonzeros	1,888
structural full rank?	yes
structural rank	479
# of blocks from dmperm	166
# strongly connected comp.	2
explicit zero entries	22
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	14,819
Cholesky flop count	1.1e+06
nnz(L+U), no partial pivoting, with AMD	29,159
nnz(V) for QR, upper bound nnz(L) for LU, with COLAMD	3,921
nnz(R) for QR, upper bound nnz(U) for LU, with COLAMD	7,539

Note that all matrix statistics (except nonzero pattern symmetry) exclude the 22 explicit zero entries.

SVD-based statistics:
norm(A)	318952
min(svd(A))	9.80668e-07
cond(A)	3.25239e+11
rank(A)	479
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.