Matrix properties
number of rows	800
number of columns	800
nonzeros	3,200
structural full rank?	yes
structural rank	800
# 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?	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	DMPERM+
nnz(chol(P*(A+A'+s*I)*P'))	11,683	12,652	8,148
Cholesky flop count	3.1e+05	3.5e+05	1.2e+05
nnz(L+U), no partial pivoting	22,566	24,504	15,496
nnz(V) for QR, upper bound nnz(L) for LU	10,785	10,726	10,550
nnz(R) for QR, upper bound nnz(U) for LU	19,190	19,177	18,864

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.