Matrix properties
number of rows	1,007
number of columns	1,007
nonzeros	8,575
structural full rank?	yes
structural rank	1,007
# 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	17,039
Cholesky flop count	3.8e+05
nnz(L+U), no partial pivoting, with AMD	33,071
nnz(V) for QR, upper bound nnz(L) for LU, with COLAMD	22,206
nnz(R) for QR, upper bound nnz(U) for LU, with COLAMD	42,212

SVD-based statistics:
norm(A)	8.9157
min(svd(A))	8.7921e-17
cond(A)	1.01406e+17
rank(A)	1,000
sprank(A)-rank(A)	7
null space dimension	7
full numerical rank?	no
singular value gap	3.87746e+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.