Matrix properties
number of rows	27,607
number of columns	27,607
nonzeros	179,395
structural full rank?	yes
structural rank	27,607
# of blocks from dmperm	2
# strongly connected comp.	2
explicit zero entries	0
nonzero pattern symmetry	symmetric
numeric value symmetry	symmetric
type	real
structure	symmetric
Cholesky candidate?	no
positive definite?	no

author	N. Duatrebande
editor	P. Toint
date	1994
kind	optimization problem
2D/3D problem?	no

Ordering statistics:	result
nnz(chol(P*(A+A'+s*I)*P')) with AMD	200,100
Cholesky flop count	1.5e+06
nnz(L+U), no partial pivoting, with AMD	372,593
nnz(V) for QR, upper bound nnz(L) for LU, with COLAMD	200,110
nnz(R) for QR, upper bound nnz(U) for LU, with COLAMD	190,564,235

SVD-based statistics:
norm(A)	4464.85
min(svd(A))	0.1
cond(A)	44648.5
rank(A)	27,607
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.