Matrix properties
number of rows	17,077
number of columns	17,077
nonzeros	875,923
structural full rank?	yes
structural rank	17,077
# 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	56,103,003
Cholesky flop count	2.8e+11
nnz(L+U), no partial pivoting, with AMD	112,188,929
nnz(V) for QR, upper bound nnz(L) for LU, with COLAMD	64,109,715
nnz(R) for QR, upper bound nnz(U) for LU, with COLAMD	95,956,598

SVD-based statistics:
norm(A)	36.9229
min(svd(A))	0.000655427
cond(A)	56334.2
rank(A)	17,077
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.