Matrix properties
number of rows	12,598
number of columns	12,598
nonzeros	196,520
structural full rank?	yes
structural rank	12,598
# of blocks from dmperm	7
# strongly connected comp.	7
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	1995
kind	duplicate structural problem
2D/3D problem?	yes

Notes:

Identical to Pothen/skirt; the latter has xyz coordinates.

Ordering statistics:	result
nnz(chol(P*(A+A'+s*I)*P')) with AMD	480,579
Cholesky flop count	3.4e+07
nnz(L+U), no partial pivoting, with AMD	948,560
nnz(V) for QR, upper bound nnz(L) for LU, with COLAMD	826,916
nnz(R) for QR, upper bound nnz(U) for LU, with COLAMD	1,528,684

SVD-based statistics:
norm(A)	23.3137
min(svd(A))	1.88483e-33
cond(A)	1.23691e+34
rank(A)	9,831
sprank(A)-rank(A)	2,767
null space dimension	2,767
full numerical rank?	no
singular value gap	1.45452e+09

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.