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	2
# 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?	yes
positive definite?	no

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

Ordering statistics:	AMD	METIS	DMPERM+
nnz(chol(P*(A+A'+s*I)*P'))	37,222	34,594	22,502
Cholesky flop count	1.5e+06	1.1e+06	3.7e+05
nnz(L+U), no partial pivoting	72,444	67,188	43,004
nnz(V) for QR, upper bound nnz(L) for LU	32,611	29,917	30,619
nnz(R) for QR, upper bound nnz(U) for LU	58,627	54,084	55,265

Maintained by Tim Davis, last updated 04-May-2008.
Matrix pictures by cspy, a MATLAB function in the CSparse package.
Matrix graphs by Yifan Hu, AT&T Labs Visualization Group.