Matrix properties
number of rows	258
number of columns	258
nonzeros	1,794
structural full rank?	yes
structural rank	258
# 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 258-by-3

Ordering statistics:	result
nnz(chol(P*(A+A'+s*I)*P')) with AMD	4,467
Cholesky flop count	1.1e+05
nnz(L+U), no partial pivoting, with AMD	8,676
nnz(V) for QR, upper bound nnz(L) for LU, with COLAMD	5,191
nnz(R) for QR, upper bound nnz(U) for LU, with COLAMD	9,301

SVD-based statistics:
norm(A)	6.97245
min(svd(A))	1.07444e-16
cond(A)	6.48941e+16
rank(A)	253
sprank(A)-rank(A)	5
null space dimension	5
full numerical rank?	no
singular value gap	8.44425e+13

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.