Matrix properties
number of rows	169,422
number of columns	169,422
nonzeros	1,279,274
structural full rank?	yes
structural rank	169,422
# 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	2006
kind	subsequent optimization problem
2D/3D problem?	no

Additional fields	size and type
b	full 169422-by-1

Notes:

next: - first: Schenk_IBMNA/c-73                                       
An earlier version (Oct. 2003) of this matrix was obtained from Olaf   
Schenk, and appears here as Schenk_IBMNA/c-73.  However, it differs    
from the version posted on his web site as of Nov. 2006.   The new     
version appears here as Schenk_IBMNA/c-73b.   The two matrices are very
similar, but not identical.                                            

Ordering statistics:	result
nnz(chol(P*(A+A'+s*I)*P')) with AMD	1,208,869
Cholesky flop count	9.7e+07
nnz(L+U), no partial pivoting, with AMD	2,248,316
nnz(V) for QR, upper bound nnz(L) for LU, with COLAMD	3,212,415,880
nnz(R) for QR, upper bound nnz(U) for LU, with COLAMD	3,593,886,023

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.