Matrix properties
number of rows	1,624
number of columns	1,624
nonzeros	6,050
structural full rank?	yes
structural rank	1,624
# 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'))	5,623	6,141
Cholesky flop count	2.5e+04	3.2e+04
nnz(L+U), no partial pivoting	9,622	10,658
nnz(V) for QR, upper bound nnz(L) for LU	8,544	9,484
nnz(R) for QR, upper bound nnz(U) for LU	16,961	19,089

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.