Matrix properties
number of rows	5,300
number of columns	5,300
nonzeros	21,842
structural full rank?	yes
structural rank	5,300
# 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	binary
structure	symmetric
Cholesky candidate?	yes
positive definite?	no

author	B. Dembart, J. Lewis
editor	I. Duff, R. Grimes, J. Lewis
date	1981
kind	power network problem
2D/3D problem?	no

Ordering statistics:	AMD	METIS
nnz(chol(P*(A+A'+s*I)*P'))	27,938	31,756
Cholesky flop count	2.5e+05	3.7e+05
nnz(L+U), no partial pivoting	50,576	58,212
nnz(V) for QR, upper bound nnz(L) for LU	52,504	61,102
nnz(R) for QR, upper bound nnz(U) for LU	103,168	118,368

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.