Matrix properties
number of rows	41,282
number of columns	41,282
nonzeros	480,536
structural full rank?	yes
structural rank	41,282
# 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	IBM
editor	O. Schenk
date	2004
kind	optimization problem
2D/3D problem?	no

Additional fields	size and type
b	full 41282-by-1

Notes:

Revised Nov 2006; relative eps changes to A, right-hand-side added.
Note that this matrix should have been placed in the Schenk_IBMNA/ 
directory when it was first added in August 2004, but moving it now
would disrupt exising users of the collection.                     

Ordering statistics:	AMD	METIS
nnz(chol(P*(A+A'+s*I)*P'))	3,167,964	3,476,329
Cholesky flop count	2.9e+09	2.7e+09
nnz(L+U), no partial pivoting	6,294,646	6,911,376
nnz(V) for QR, upper bound nnz(L) for LU	26,903,376	20,024,915
nnz(R) for QR, upper bound nnz(U) for LU	44,707,535	40,343,227

Maintained by Tim Davis, last updated 30-Sep-2008.
Matrix pictures by cspy, a MATLAB function in the CSparse package.
Matrix graphs by Yifan Hu, AT&T Labs Visualization Group.