Matrix properties
number of rows	1,138
number of columns	1,138
nonzeros	4,054
structural full rank?	yes
structural rank	1,138
# 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	real
structure	symmetric
Cholesky candidate?	yes
positive definite?	yes

author	D. Tylavsky
editor	I. Duff, R. Grimes, J. Lewis
date	1985
kind	power network problem
2D/3D problem?	no

Ordering statistics:	AMD	METIS
nnz(chol(P*(A+A'+s*I)*P'))	3,265	3,627
Cholesky flop count	1.1e+04	1.6e+04
nnz(L+U), no partial pivoting	5,392	6,116
nnz(V) for QR, upper bound nnz(L) for LU	4,443	5,516
nnz(R) for QR, upper bound nnz(U) for LU	9,002	11,000

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.