Matrix properties
number of rows	381
number of columns	381
nonzeros	2,134
structural full rank?	yes
structural rank	381
# of blocks from dmperm	6
# strongly connected comp.	1
explicit zero entries	23
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	17,262
Cholesky flop count	1.5e+06
nnz(L+U), no partial pivoting, with AMD	34,143
nnz(V) for QR, upper bound nnz(L) for LU, with COLAMD	9,653
nnz(R) for QR, upper bound nnz(U) for LU, with COLAMD	18,643

Note that all matrix statistics (except nonzero pattern symmetry) exclude the 23 explicit zero entries.

SVD-based statistics:
norm(A)	1715.33
min(svd(A))	0.00136636
cond(A)	1.25539e+06
rank(A)	381
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.