Matrix properties
number of rows	1,005
number of columns	1,005
nonzeros	8,621
structural full rank?	yes
structural rank	1,005
# 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	19,001
Cholesky flop count	6.6e+05
nnz(L+U), no partial pivoting, with AMD	36,997
nnz(V) for QR, upper bound nnz(L) for LU, with COLAMD	30,980
nnz(R) for QR, upper bound nnz(U) for LU, with COLAMD	57,016

SVD-based statistics:
norm(A)	16.4065
min(svd(A))	3.88612e-18
cond(A)	4.22181e+18
rank(A)	995
sprank(A)-rank(A)	10
null space dimension	10
full numerical rank?	no
singular value gap	6.25819e+12

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.