Matrix properties
number of rows	5,300
number of columns	5,300
nonzeros	21,842
structural full rank?	yes
structural rank	5,300
# of blocks from dmperm	1
# strongly connected comp.	1
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:	result
nnz(chol(P*(A+A'+s*I)*P')) with AMD	27,938
Cholesky flop count	2.5e+05
nnz(L+U), no partial pivoting, with AMD	50,576
nnz(V) for QR, upper bound nnz(L) for LU, with COLAMD	52,504
nnz(R) for QR, upper bound nnz(U) for LU, with COLAMD	103,168

SVD-based statistics:
norm(A)	6.81536
min(svd(A))	4.32344e-17
cond(A)	1.57637e+17
rank(A)	5,276
sprank(A)-rank(A)	24
null space dimension	24
full numerical rank?	no
singular value gap	2.40712e+11

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.