Matrix properties
number of rows	49
number of columns	49
nonzeros	167
structural full rank?	yes
structural rank	49
# 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	129
Cholesky flop count	3.6e+02
nnz(L+U), no partial pivoting, with AMD	209
nnz(V) for QR, upper bound nnz(L) for LU, with COLAMD	149
nnz(R) for QR, upper bound nnz(U) for LU, with COLAMD	275

SVD-based statistics:
norm(A)	4.30857
min(svd(A))	1.32075e-16
cond(A)	3.26221e+16
rank(A)	48
sprank(A)-rank(A)	1
null space dimension	1
full numerical rank?	no
singular value gap	5.75129e+14

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.