Matrix properties
number of rows	1,484
number of columns	1,484
nonzeros	6,110
structural full rank?	yes
structural rank	1,484
# of blocks from dmperm	3
# strongly connected comp.	3
explicit zero entries	0
nonzero pattern symmetry	symmetric
numeric value symmetry	5%
type	real
structure	unsymmetric
Cholesky candidate?	no
positive definite?	no

author	D. Ndereyimana
editor	Z. Bai, D. Day, J. Demmel, J. Dongarra
date	1994
kind	power network problem
2D/3D problem?	no

Ordering statistics:	result
nnz(chol(P*(A+A'+s*I)*P')) with AMD	5,919
Cholesky flop count	2.6e+04
nnz(L+U), no partial pivoting, with AMD	10,354
nnz(V) for QR, upper bound nnz(L) for LU, with COLAMD	7,508
nnz(R) for QR, upper bound nnz(U) for LU, with COLAMD	14,796

SVD-based statistics:
norm(A)	1.25679e+16
min(svd(A))	0.0120326
cond(A)	1.04449e+18
rank(A)	708
sprank(A)-rank(A)	776
null space dimension	776
full numerical rank?	no
singular value gap	1.17732

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.