Matrix properties
number of rows	17,500
number of columns	17,500
nonzeros	114,962
structural full rank?	yes
structural rank	17,500
# of blocks from dmperm	1
# strongly connected comp.	1
entries not in dmperm blocks	0
explicit zero entries	7,500
nonzero pattern symmetry	symmetric
numeric value symmetry	symmetric
type	real
structure	symmetric
Cholesky candidate?	yes
positive definite?	no

author	N. Gould
editor	N. Gould
date	1995
kind	optimization problem
2D/3D problem?	no

Ordering statistics:	AMD	METIS
nnz(chol(P*(A+A'+s*I)*P'))	4,028,563	2,112,281
Cholesky flop count	5.0e+09	1.2e+09
nnz(L+U), no partial pivoting	8,039,626	4,207,062
nnz(V) for QR, upper bound nnz(L) for LU	12,079,298	5,595,543
nnz(R) for QR, upper bound nnz(U) for LU	29,214,061	13,661,319

Note that all matrix statistics (except nonzero pattern symmetry) exclude the 7500 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.