Matrix properties
number of rows	27,607
number of columns	27,607
nonzeros	179,395
structural full rank?	yes
structural rank	27,607
# of blocks from dmperm	2
# strongly connected comp.	2
entries not in dmperm blocks	0
explicit zero entries	0
nonzero pattern symmetry	symmetric
numeric value symmetry	symmetric
type	real
structure	symmetric
Cholesky candidate?	yes
positive definite?	no

author	N. Duatrebande
editor	P. Toint
date	1994
kind	optimization problem
2D/3D problem?	no

Ordering statistics:	AMD	METIS	DMPERM+
nnz(chol(P*(A+A'+s*I)*P'))	200,100	226,778	248,395
Cholesky flop count	1.5e+06	1.9e+06	2.2e+06
nnz(L+U), no partial pivoting	372,593	425,949	469,183
nnz(V) for QR, upper bound nnz(L) for LU	72,625,002	-	72,625,002
nnz(R) for QR, upper bound nnz(U) for LU	95,735,644	-	95,735,644

Maintained by Tim Davis, last updated 04-May-2008.
Matrix pictures by cspy, a MATLAB function in the CSparse package.
Matrix graphs by Yifan Hu, AT&T Labs Visualization Group.