Matrix properties
number of rows	1,612
number of columns	1,612
nonzeros	5,824
structural full rank?	yes
structural rank	1,612
# 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	5,285
Cholesky flop count	2.1e+04
nnz(L+U), no partial pivoting, with AMD	8,958
nnz(V) for QR, upper bound nnz(L) for LU, with COLAMD	7,487
nnz(R) for QR, upper bound nnz(U) for LU, with COLAMD	14,867

SVD-based statistics:
norm(A)	5.66517
min(svd(A))	6.58248e-18
cond(A)	8.60643e+17
rank(A)	1,601
sprank(A)-rank(A)	11
null space dimension	11
full numerical rank?	no
singular value gap	1.71265e+12

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.