Matrix properties
number of rows	2,290
number of columns	2,290
nonzeros	14,873
structural full rank?	yes
structural rank	2,290
# of blocks from dmperm	1
# strongly connected comp.	1
explicit zero entries	0
nonzero pattern symmetry	73%
numeric value symmetry	0%
type	real
structure	unsymmetric
Cholesky candidate?	no
positive definite?	no

author	Sieber
editor	T. Davis
date	2006
kind	counter-example problem
2D/3D problem?	no

Additional fields	size and type
b	full 2290-by-1

Ordering statistics:	result
nnz(chol(P*(A+A'+s*I)*P')) with AMD	16,008
Cholesky flop count	1.1e+05
nnz(L+U), no partial pivoting, with AMD	29,726
nnz(V) for QR, upper bound nnz(L) for LU, with COLAMD	12,582
nnz(R) for QR, upper bound nnz(U) for LU, with COLAMD	2,623,195

SVD-based statistics:
norm(A)	408380
min(svd(A))	0.000885182
cond(A)	4.61351e+08
rank(A)	2,290
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.