Matrix properties
number of rows	4,410
number of columns	4,410
nonzeros	219,024
structural full rank?	yes
structural rank	4,410
# of blocks from dmperm	1
# strongly connected comp.	1
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	A. Mera, R. Cigel, J. Lewis
editor	I. Duff, R. Grimes, J. Lewis
date	1984
kind	structural problem
2D/3D problem?	yes

Ordering statistics:	AMD	METIS
nnz(chol(P*(A+A'+s*I)*P'))	340,375	407,462
Cholesky flop count	3.5e+07	5.5e+07
nnz(L+U), no partial pivoting	676,340	810,514
nnz(V) for QR, upper bound nnz(L) for LU	648,033	533,121
nnz(R) for QR, upper bound nnz(U) for LU	1,297,720	1,016,217

Maintained by Tim Davis, last updated 30-Sep-2008.
Matrix pictures by cspy, a MATLAB function in the CSparse package.
Matrix graphs by Yifan Hu, AT&T Labs Visualization Group.