Matrix properties
number of rows	50,000
number of columns	50,000
nonzeros	1,548,988
structural full rank?	yes
structural rank	50,000
# 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?	no
positive definite?	no

author	N. Gould
editor	N. Gould
date	1995
kind	structural problem
2D/3D problem?	yes

Ordering statistics:	AMD	METIS
nnz(chol(P*(A+A'+s*I)*P'))	552,420,000	202,758,827
Cholesky flop count	1.1e+13	1.4e+12
nnz(L+U), no partial pivoting	1,104,790,000	405,467,654
nnz(V) for QR, upper bound nnz(L) for LU	537,136,477	333,144,820
nnz(R) for QR, upper bound nnz(U) for LU	798,490,345	568,789,320

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.