Matrix properties
number of rows	12,598
number of columns	12,598
nonzeros	196,520
structural full rank?	yes
structural rank	12,598
# of blocks from dmperm	7
# strongly connected comp.	7
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	NASA
editor	G. Kumfert, A. Pothen
date	1995
kind	duplicate structural problem
2D/3D problem?	yes

Notes:

Identical to Pothen/skirt; the latter has xyz coordinates.

Ordering statistics:	AMD	METIS	DMPERM+
nnz(chol(P*(A+A'+s*I)*P'))	480,579	483,714	479,756
Cholesky flop count	3.4e+07	3.1e+07	3.4e+07
nnz(L+U), no partial pivoting	948,560	954,830	946,914
nnz(V) for QR, upper bound nnz(L) for LU	826,916	665,925	661,443
nnz(R) for QR, upper bound nnz(U) for LU	1,528,684	1,257,205	1,231,041

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.