Matrix properties
number of rows	6,691
number of columns	6,691
nonzeros	46,187
structural full rank?	yes
structural rank	6,691
# 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 6691-by-2

Ordering statistics:	result
nnz(chol(P*(A+A'+s*I)*P')) with AMD	109,795
Cholesky flop count	4.0e+06
nnz(L+U), no partial pivoting, with AMD	212,899
nnz(V) for QR, upper bound nnz(L) for LU, with COLAMD	221,114
nnz(R) for QR, upper bound nnz(U) for LU, with COLAMD	421,525

SVD-based statistics:
norm(A)	7.3183
min(svd(A))	0.000566646
cond(A)	12915.1
rank(A)	6,691
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.