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
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:	result
nnz(chol(P*(A+A'+s*I)*P')) with AMD	3,265
Cholesky flop count	1.1e+04
nnz(L+U), no partial pivoting, with AMD	5,392
nnz(V) for QR, upper bound nnz(L) for LU, with COLAMD	4,443
nnz(R) for QR, upper bound nnz(U) for LU, with COLAMD	9,002

SVD-based statistics:
norm(A)	30148.8
min(svd(A))	0.00351686
cond(A)	8.57265e+06
rank(A)	1,138
sprank(A)-rank(A)	0
null space dimension	0
full numerical rank?	yes

singular values (MAT file):	click here
SVD method used:	s = svd (full (A)) ;
status:	ok

For a description of the statistics displayed above, click here.

Maintained by Tim Davis, last updated 12-Mar-2014.
Matrix pictures by cspy, a MATLAB function in the CSparse package.
Matrix graphs by Yifan Hu, AT&T Labs Visualization Group.