Matrix properties
number of rows	289
number of columns	289
nonzeros	1,377
structural full rank?	yes
structural rank	289
# of blocks from dmperm	1
# strongly connected comp.	1
explicit zero entries	512
nonzero pattern symmetry	symmetric
numeric value symmetry	symmetric
type	real
structure	symmetric
Cholesky candidate?	yes
positive definite?	yes

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

Additional fields	size and type
coord	full 289-by-2

Ordering statistics:	result
nnz(chol(P*(A+A'+s*I)*P')) with AMD	2,433
Cholesky flop count	2.8e+04
nnz(L+U), no partial pivoting, with AMD	4,577
nnz(V) for QR, upper bound nnz(L) for LU, with COLAMD	3,468
nnz(R) for QR, upper bound nnz(U) for LU, with COLAMD	6,184

Note that all matrix statistics (except nonzero pattern symmetry) exclude the 512 explicit zero entries.

SVD-based statistics:
norm(A)	8.92772
min(svd(A))	1
cond(A)	8.92772
rank(A)	289
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.