Matrix properties
number of rows	23,120
number of columns	23,120
nonzeros	1,489,200
structural full rank?	yes
structural rank	23,120
# of blocks from dmperm	2
# strongly connected comp.	2
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	A. Andrianov
editor	T. Davis
date	2006
kind	optimization problem
2D/3D problem?	no

Ordering statistics:	AMD	METIS	DMPERM+
nnz(chol(P*(A+A'+s*I)*P'))	21,359,951	16,505,651	15,016,372
Cholesky flop count	5.6e+10	3.4e+10	2.9e+10
nnz(L+U), no partial pivoting	42,696,782	32,988,182	30,009,624
nnz(V) for QR, upper bound nnz(L) for LU	65,795,462	79,675,540	73,112,304
nnz(R) for QR, upper bound nnz(U) for LU	116,259,320	134,063,070	127,644,439

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.