Matrix properties
number of rows	12,111
number of columns	12,111
nonzeros	73,963
structural full rank?	yes
structural rank	12,111
# 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	N. Gould
editor	N. Gould
date	1994
kind	optimization problem
2D/3D problem?	no

Ordering statistics:	result
nnz(chol(P*(A+A'+s*I)*P')) with AMD	2,222,105
Cholesky flop count	2.2e+09
nnz(L+U), no partial pivoting, with AMD	4,432,099
nnz(V) for QR, upper bound nnz(L) for LU, with COLAMD	6,506,571
nnz(R) for QR, upper bound nnz(U) for LU, with COLAMD	14,173,093

SVD-based statistics:
norm(A)	7.58021e+12
min(svd(A))	5.22926e-17
cond(A)	1.44958e+29
rank(A)	7,087
sprank(A)-rank(A)	5,024
null space dimension	5,024
full numerical rank?	no
singular value gap	1.74456

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.