Matrix properties
number of rows	2,021
number of columns	2,021
nonzeros	7,310
structural full rank?	yes
structural rank	2,021
# of blocks from dmperm	522
# strongly connected comp.	1
explicit zero entries	43
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	167,878
Cholesky flop count	4.8e+07
nnz(L+U), no partial pivoting, with AMD	333,735
nnz(V) for QR, upper bound nnz(L) for LU, with COLAMD	7,675
nnz(R) for QR, upper bound nnz(U) for LU, with COLAMD	19,676

Note that all matrix statistics (except nonzero pattern symmetry) exclude the 43 explicit zero entries.

SVD-based statistics:
norm(A)	319086
min(svd(A))	2.44767e-07
cond(A)	1.30363e+12
rank(A)	2,021
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.