Matrix properties
number of rows	800
number of columns	800
nonzeros	9,322
structural full rank?	yes
structural rank	800
# 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'))	45,112	49,077
Cholesky flop count	6.7e+06	7.3e+06
nnz(L+U), no partial pivoting	89,424	97,354
nnz(V) for QR, upper bound nnz(L) for LU	218,242	179,144
nnz(R) for QR, upper bound nnz(U) for LU	260,361	267,855

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.