Matrix properties
number of rows	24,842
number of columns	24,842
nonzeros	158,426
structural full rank?	yes
structural rank	24,842
# of blocks from dmperm	31
# strongly connected comp.	7
explicit zero entries	1,555
nonzero pattern symmetry	98%
numeric value symmetry	10%
type	real
structure	unsymmetric
Cholesky candidate?	no
positive definite?	no

author	A. Wang
editor	T. Davis
date	2007
kind	power network problem
2D/3D problem?	no

Additional fields	size and type
b	full 24842-by-1

Ordering statistics:	result
nnz(chol(P*(A+A'+s*I)*P')) with AMD	124,423
Cholesky flop count	8.6e+05
nnz(L+U), no partial pivoting, with AMD	224,004
nnz(V) for QR, upper bound nnz(L) for LU, with COLAMD	208,510
nnz(R) for QR, upper bound nnz(U) for LU, with COLAMD	427,644

Note that all matrix statistics (except nonzero pattern symmetry) exclude the 1555 explicit zero entries.

SVD-based statistics:
norm(A)	364646
min(svd(A))	0.00750594
cond(A)	4.85809e+07
rank(A)	24,842
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.