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'))	8,333	8,456	5,524
Cholesky flop count	1.2e+05	1.2e+05	4.1e+04
nnz(L+U), no partial pivoting	15,866	16,112	10,248
nnz(V) for QR, upper bound nnz(L) for LU	7,040	6,785	6,804
nnz(R) for QR, upper bound nnz(U) for LU	12,610	12,349	12,364

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.