Matrix properties
number of rows	1,242
number of columns	1,242
nonzeros	10,426
structural full rank?	yes
structural rank	1,242
# 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	21,665
Cholesky flop count	5.8e+05
nnz(L+U), no partial pivoting, with AMD	42,088
nnz(V) for QR, upper bound nnz(L) for LU, with COLAMD	31,052
nnz(R) for QR, upper bound nnz(U) for LU, with COLAMD	58,683

SVD-based statistics:
norm(A)	9.3912
min(svd(A))	7.06201e-34
cond(A)	1.32982e+34
rank(A)	1,178
sprank(A)-rank(A)	64
null space dimension	64
full numerical rank?	no
singular value gap	2.01283e+10

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.