Matrix properties
number of rows	1,440
number of columns	1,440
nonzeros	44,998
structural full rank?	yes
structural rank	1,440
# of blocks from dmperm	1
# strongly connected comp.	1
entries not in dmperm blocks	0
explicit zero entries	1,272
nonzero pattern symmetry	symmetric
numeric value symmetry	symmetric
type	real
structure	symmetric
Cholesky candidate?	yes
positive definite?	yes

author	R. Grimes
editor	T. Davis
date	1995
kind	structural problem
2D/3D problem?	yes

Ordering statistics:	AMD	METIS
nnz(chol(P*(A+A'+s*I)*P'))	113,509	100,732
Cholesky flop count	1.2e+07	8.5e+06
nnz(L+U), no partial pivoting	225,578	200,024
nnz(V) for QR, upper bound nnz(L) for LU	210,689	129,700
nnz(R) for QR, upper bound nnz(U) for LU	405,343	227,609

Note that all matrix statistics (except nonzero pattern symmetry) exclude the 1272 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.