Matrix properties
number of rows	8,219
number of columns	8,219
nonzeros	242,669
structural full rank?	yes
structural rank	8,219
# of blocks from dmperm	1
# strongly connected comp.	1
explicit zero entries	0
nonzero pattern symmetry	symmetric
numeric value symmetry	symmetric
type	real
structure	symmetric
Cholesky candidate?	yes
positive definite?	no

author	Y. Zhou, Y. Saad, M. Tiago, J. Chelikowsky
editor	T. Davis
date	2005
kind	theoretical/quantum chemistry problem
2D/3D problem?	no

Ordering statistics:	result
nnz(chol(P*(A+A'+s*I)*P')) with AMD	12,897,079
Cholesky flop count	3.0e+10
nnz(L+U), no partial pivoting, with AMD	25,785,939
nnz(V) for QR, upper bound nnz(L) for LU, with COLAMD	14,908,336
nnz(R) for QR, upper bound nnz(U) for LU, with COLAMD	21,837,776

SVD-based statistics:
norm(A)	58.3937
min(svd(A))	0.0401419
cond(A)	1454.68
rank(A)	8,219
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.