Matrix properties
number of rows	503,712
number of columns	503,712
nonzeros	36,816,170
structural full rank?	yes
structural rank	503,712
# of blocks from dmperm	1
# strongly connected comp.	1
entries not in dmperm blocks	0
explicit zero entries	172
nonzero pattern symmetry	symmetric
numeric value symmetry	symmetric
type	real
structure	symmetric
Cholesky candidate?	yes
positive definite?	yes

author	S. Mayer
editor	J. Koster
date	2004
kind	structural problem
2D/3D problem?	yes

Ordering statistics:	AMD	METIS
nnz(chol(P*(A+A'+s*I)*P'))	222,416,390	176,867,274
Cholesky flop count	2.6e+11	1.6e+11
nnz(L+U), no partial pivoting	444,329,068	353,230,836
nnz(V) for QR, upper bound nnz(L) for LU	433,040,185	-
nnz(R) for QR, upper bound nnz(U) for LU	1,157,601,369	-

Note that all matrix statistics (except nonzero pattern symmetry) exclude the 172 explicit zero entries.

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.