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
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:	result
nnz(chol(P*(A+A'+s*I)*P')) with AMD	3,167,964
Cholesky flop count	2.9e+09
nnz(L+U), no partial pivoting, with AMD	6,294,646
nnz(V) for QR, upper bound nnz(L) for LU, with COLAMD	85,760,889
nnz(R) for QR, upper bound nnz(U) for LU, with COLAMD	120,680,899

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.