Matrix properties
number of rows	15,838
number of columns	15,838
nonzeros	64,424
structural full rank?	yes
structural rank	15,838
# of blocks from dmperm	3,600
# strongly connected comp.	3,600
entries not in dmperm blocks	7,346
explicit zero entries	3,138
nonzero pattern symmetry	59%
numeric value symmetry	53%
type	real
structure	unsymmetric
Cholesky candidate?	no
positive definite?	no

author	W. Liu
editor	T. Davis
date	2004
kind	power network problem
2D/3D problem?	no

Additional fields	size and type
b	full 15838-by-1

Ordering statistics:	AMD	METIS	DMPERM+
nnz(chol(P*(A+A'+s*I)*P'))	59,254	68,418	50,549
Cholesky flop count	2.5e+05	3.9e+05	2.1e+05
nnz(L+U), no partial pivoting	102,670	120,998	92,606
nnz(V) for QR, upper bound nnz(L) for LU	48,703	54,341	44,762
nnz(R) for QR, upper bound nnz(U) for LU	102,067	118,715	94,360

Note that all matrix statistics (except nonzero pattern symmetry) exclude the 3138 explicit zero entries.

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.