Matrix properties
number of rows	882
number of columns	882
nonzeros	3,354
structural full rank?	yes
structural rank	882
# of blocks from dmperm	43
# strongly connected comp.	1
explicit zero entries	0
nonzero pattern symmetry	93%
numeric value symmetry	0%
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	3,264
Cholesky flop count	1.3e+04
nnz(L+U), no partial pivoting, with AMD	5,646
nnz(V) for QR, upper bound nnz(L) for LU, with COLAMD	3,720
nnz(R) for QR, upper bound nnz(U) for LU, with COLAMD	7,546

SVD-based statistics:
norm(A)	6.68635e+12
min(svd(A))	0.000271825
cond(A)	2.4598e+16
rank(A)	821
sprank(A)-rank(A)	61
null space dimension	61
full numerical rank?	no
singular value gap	1.01854

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.