Matrix properties
number of rows	39
number of columns	39
nonzeros	131
structural full rank?	yes
structural rank	39
# 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	104
Cholesky flop count	2.9e+02
nnz(L+U), no partial pivoting, with AMD	169
nnz(V) for QR, upper bound nnz(L) for LU, with COLAMD	111
nnz(R) for QR, upper bound nnz(U) for LU, with COLAMD	194

SVD-based statistics:
norm(A)	3.83636
min(svd(A))	0.0730734
cond(A)	52.5001
rank(A)	39
sprank(A)-rank(A)	0
null space dimension	0
full numerical rank?	yes

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.