Matrix properties
number of rows	160,000
number of columns	160,000
nonzeros	1,750,416
structural full rank?	yes
structural rank	160,000
# of blocks from dmperm	1
# strongly connected comp.	1
explicit zero entries	0
nonzero pattern symmetry	55%
numeric value symmetry	0%
type	real
structure	unsymmetric
Cholesky candidate?	no
positive definite?	no

author	Q. Li and M. Ferris
editor	T. Davis
date	2007
kind	optimization problem
2D/3D problem?	no

Notes:

QLi/crashbasis and QLi/majorbasis have the same nonzero pattern.  However,
UMFPACK 5.1 is much slower for majorbasis than for crashbasis, because of 
the extensive number of denormal floating-point values that occur in      
majorbasis (they do not occur in crashbasis).                             

Ordering statistics:	result
nnz(chol(P*(A+A'+s*I)*P')) with AMD	21,987,956
Cholesky flop count	1.2e+10
nnz(L+U), no partial pivoting, with AMD	43,815,912
nnz(V) for QR, upper bound nnz(L) for LU, with COLAMD	11,705,268
nnz(R) for QR, upper bound nnz(U) for LU, with COLAMD	22,790,462

For a description of the statistics displayed above, click here.

Maintained by Tim Davis, last updated 12-Mar-2014.
Matrix pictures by cspy, a MATLAB function in the CSparse package.
Matrix graphs by Yifan Hu, AT&T Labs Visualization Group.