Matrix properties
number of rows	500
number of columns	500
nonzeros	28,726
structural full rank?	yes
structural rank	500
# of blocks from dmperm	37
# strongly connected comp.	37
entries not in dmperm blocks	0
explicit zero entries	0
nonzero pattern symmetry	symmetric
numeric value symmetry	93%
type	real
structure	unsymmetric
Cholesky candidate?	no
positive definite?	no

author	D.Yang
editor	T. Davis
date	2003
kind	computer graphics/vision problem
2D/3D problem?	yes

Ordering statistics:	AMD	METIS	DMPERM+
nnz(chol(P*(A+A'+s*I)*P'))	19,344	19,480	19,480
Cholesky flop count	1.1e+06	1.2e+06	1.2e+06
nnz(L+U), no partial pivoting	38,188	38,460	38,460
nnz(V) for QR, upper bound nnz(L) for LU	55,069	95,525	95,731
nnz(R) for QR, upper bound nnz(U) for LU	105,890	106,871	106,914

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.