Matrix properties
number of rows	256,000
number of columns	256,000
nonzeros	1,766,400
structural full rank?	yes
structural rank	256,000
# 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?	no

author	C. Lin
editor	T. Davis
date	2004
kind	structural problem
2D/3D problem?	yes

Ordering statistics:	AMD	METIS
nnz(chol(P*(A+A'+s*I)*P'))	171,531,852	102,018,474
Cholesky flop count	7.3e+11	2.6e+11
nnz(L+U), no partial pivoting	342,807,704	203,780,948
nnz(V) for QR, upper bound nnz(L) for LU	399,966,806	203,330,300
nnz(R) for QR, upper bound nnz(U) for LU	705,014,796	361,999,300

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.