Matrix properties
number of rows	40,000
number of columns	40,000
nonzeros	197,608
structural full rank?	yes
structural rank	40,000
# of blocks from dmperm	5
# strongly connected comp.	5
explicit zero entries	0
nonzero pattern symmetry	symmetric
numeric value symmetry	symmetric
type	real
structure	symmetric
Cholesky candidate?	yes
positive definite?	yes

author	R. Dembo, U. Tulowitzki
editor	P. Toint
date	1983
kind	duplicate optimization problem
2D/3D problem?	no

Notes:

duplicate of GHS_psdef/obstclae

Ordering statistics:	result
nnz(chol(P*(A+A'+s*I)*P')) with AMD	1,058,836
Cholesky flop count	1.2e+08
nnz(L+U), no partial pivoting, with AMD	2,077,672
nnz(V) for QR, upper bound nnz(L) for LU, with COLAMD	2,073,834
nnz(R) for QR, upper bound nnz(U) for LU, with COLAMD	3,783,582

SVD-based statistics:
norm(A)	8.1995
min(svd(A))	0.2
cond(A)	40.9975
rank(A)	40,000
sprank(A)-rank(A)	0
null space dimension	0
full numerical rank?	yes

singular values (MAT file):	click here
SVD method used:	s = svd (full (A))
status:	ok

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.