Matrix properties
number of rows	2,680
number of columns	2,680
nonzeros	25,026
structural full rank?	yes
structural rank	2,680
# 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	52,498
Cholesky flop count	1.5e+06
nnz(L+U), no partial pivoting, with AMD	102,316
nnz(V) for QR, upper bound nnz(L) for LU, with COLAMD	90,586
nnz(R) for QR, upper bound nnz(U) for LU, with COLAMD	173,235

SVD-based statistics:
norm(A)	11.509
min(svd(A))	1.01486e-18
cond(A)	1.13405e+19
rank(A)	2,640
sprank(A)-rank(A)	40
null space dimension	40
full numerical rank?	no
singular value gap	2.4791e+11

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.