Matrix properties
number of rows	7,920
number of columns	7,920
nonzeros	31,680
structural full rank?	yes
structural rank	7,920
# of blocks from dmperm	1
# strongly connected comp.	1
explicit zero entries	0
nonzero pattern symmetry	symmetric
numeric value symmetry	symmetric
type	binary
structure	symmetric
Cholesky candidate?	yes
positive definite?	no

author	NASA
editor	G. Kumfert, A. Pothen
date	2003
kind	structural problem
2D/3D problem?	yes

Additional fields	size and type
coord	full 7920-by-3

Ordering statistics:	result
nnz(chol(P*(A+A'+s*I)*P')) with AMD	75,492
Cholesky flop count	1.6e+06
nnz(L+U), no partial pivoting, with AMD	143,064
nnz(V) for QR, upper bound nnz(L) for LU, with COLAMD	133,108
nnz(R) for QR, upper bound nnz(U) for LU, with COLAMD	248,755

SVD-based statistics:
norm(A)	4
min(svd(A))	0.000491843
cond(A)	8132.68
rank(A)	7,920
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.