Matrix properties
number of rows	50,000
number of columns	50,000
nonzeros	349,968
structural full rank?	yes
structural rank	50,000
# of blocks from dmperm	6
# strongly connected comp.	6
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?	yes

author	N. Gould
editor	N. Gould
date	1995
kind	optimization problem
2D/3D problem?	no

Ordering statistics:	AMD	METIS	DMPERM+
nnz(chol(P*(A+A'+s*I)*P'))	4,241,463	2,073,553	2,036,537
Cholesky flop count	3.4e+09	4.9e+08	4.7e+08
nnz(L+U), no partial pivoting	8,432,926	4,097,106	4,023,074
nnz(V) for QR, upper bound nnz(L) for LU	4,271,389	4,035,313	4,074,616
nnz(R) for QR, upper bound nnz(U) for LU	7,821,888	7,346,284	7,335,022

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.