Matrix properties
number of rows	1,723
number of columns	1,723
nonzeros	6,511
structural full rank?	yes
structural rank	1,723
# 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'))	6,216	7,014
Cholesky flop count	2.9e+04	4.2e+04
nnz(L+U), no partial pivoting	10,709	12,305
nnz(V) for QR, upper bound nnz(L) for LU	10,041	10,966
nnz(R) for QR, upper bound nnz(U) for LU	20,137	22,096

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.