Matrix properties
number of rows	310
number of columns	310
nonzeros	2,448
structural full rank?	yes
structural rank	310
# 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	G. Everstine, D. Taylor
editor	I. Duff, R. Grimes, J. Lewis
date	1980
kind	structural problem
2D/3D problem?	yes

Ordering statistics:	result
nnz(chol(P*(A+A'+s*I)*P')) with AMD	3,143
Cholesky flop count	3.5e+04
nnz(L+U), no partial pivoting, with AMD	5,976
nnz(V) for QR, upper bound nnz(L) for LU, with COLAMD	3,034
nnz(R) for QR, upper bound nnz(U) for LU, with COLAMD	5,515

SVD-based statistics:
norm(A)	8.56463
min(svd(A))	0.00261988
cond(A)	3269.09
rank(A)	310
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.