Matrix properties
number of rows	221,119
number of columns	221,119
nonzeros	7,666,057
structural full rank?	yes
structural rank	221,119
# 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	5,034,289,125
Cholesky flop count	1.9e+14
nnz(L+U), no partial pivoting, with AMD	10,068,357,131
nnz(V) for QR, upper bound nnz(L) for LU, with COLAMD	5,167,064,035
nnz(R) for QR, upper bound nnz(U) for LU, with COLAMD	8,716,233,055

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.