Matrix properties
number of rows	2,000
number of columns	2,000
nonzeros	39,980
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?	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
nnz(chol(P*(A+A'+s*I)*P'))	967,830	1,072,265
Cholesky flop count	8.5e+08	1.0e+09
nnz(L+U), no partial pivoting	1,933,660	2,142,530
nnz(V) for QR, upper bound nnz(L) for LU	1,734,813	1,647,108
nnz(R) for QR, upper bound nnz(U) for LU	1,880,150	1,904,339

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.