Matrix properties
number of rows	2,000
number of columns	2,000
nonzeros	8,000
structural full rank?	yes
structural rank	2,000
# of blocks from dmperm	1
# strongly connected comp.	1
entries not in dmperm blocks	0
explicit zero entries	0
nonzero pattern symmetry	symmetric
numeric value symmetry	symmetric
type	integer
structure	symmetric
Cholesky candidate?	no
positive definite?	no

author	C. Helmberg
editor	Y. Ye
date	1996
kind	undirected weighted random graph
2D/3D problem?	no

Ordering statistics:	AMD	METIS
nnz(chol(P*(A+A'+s*I)*P'))	39,815	37,960
Cholesky flop count	1.9e+06	1.5e+06
nnz(L+U), no partial pivoting	77,630	73,920
nnz(V) for QR, upper bound nnz(L) for LU	49,183	40,372
nnz(R) for QR, upper bound nnz(U) for LU	86,373	71,951

Maintained by Tim Davis, last updated 30-Sep-2008.
Matrix pictures by cspy, a MATLAB function in the CSparse package.
Matrix graphs by Yifan Hu, AT&T Labs Visualization Group.