Matrix properties
number of rows	20,685
number of columns	20,685
nonzeros	2,454,957
structural full rank?	yes
structural rank	20,685
# 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	binary
structure	symmetric
Cholesky candidate?	yes
positive definite?	no

author	C. Damhaug
editor	N. Gould, Y. Hu, J. Scott
date	2004
kind	structural problem
2D/3D problem?	yes

Ordering statistics:	AMD	METIS
nnz(chol(P*(A+A'+s*I)*P'))	6,409,887	6,202,266
Cholesky flop count	3.6e+09	2.7e+09
nnz(L+U), no partial pivoting	12,799,089	12,383,847
nnz(V) for QR, upper bound nnz(L) for LU	10,485,024	10,620,828
nnz(R) for QR, upper bound nnz(U) for LU	24,503,550	23,068,374

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.