Matrix properties
number of rows	66
number of columns	66
nonzeros	320
structural full rank?	yes
structural rank	66
# 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	193
Cholesky flop count	5.7e+02
nnz(L+U), no partial pivoting, with AMD	320
nnz(V) for QR, upper bound nnz(L) for LU, with COLAMD	193
nnz(R) for QR, upper bound nnz(U) for LU, with COLAMD	321

SVD-based statistics:
norm(A)	5.00324
min(svd(A))	0.0334763
cond(A)	149.456
rank(A)	66
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.