Matrix properties
number of rows	30,200
number of columns	30,200
nonzeros	80,000
structural full rank?	no
structural rank	20,000
# of blocks from dmperm	2
# strongly connected comp.	1
explicit zero entries	0
nonzero pattern symmetry	symmetric
numeric value symmetry	symmetric
type	integer
structure	symmetric
Cholesky candidate?	yes
positive definite?	no

author	N. Gould
editor	N. Gould
date	1994
kind	2D/3D problem
2D/3D problem?	yes

Ordering statistics:	AMD	METIS
nnz(chol(P*(A+A'+s*I)*P'))	257,245	299,321
Cholesky flop count	1.2e+07	1.4e+07
nnz(L+U), no partial pivoting	484,290	568,442
nnz(V) for QR, upper bound nnz(L) for LU	3,414,104	2,777,593
nnz(R) for QR, upper bound nnz(U) for LU	694,211	689,815

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.