Matrix properties
number of rows	1,089
number of columns	1,089
nonzeros	7,361
structural full rank?	yes
structural rank	1,089
# 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	A. George
editor	I. Duff, R. Grimes, J. Lewis
date	1978
kind	2D/3D problem
2D/3D problem?	yes

Ordering statistics:	result
nnz(chol(P*(A+A'+s*I)*P')) with AMD	18,331
Cholesky flop count	4.6e+05
nnz(L+U), no partial pivoting, with AMD	35,573
nnz(V) for QR, upper bound nnz(L) for LU, with COLAMD	23,763
nnz(R) for QR, upper bound nnz(U) for LU, with COLAMD	44,136

SVD-based statistics:
norm(A)	6.96774
min(svd(A))	0.00596345
cond(A)	1168.41
rank(A)	1,089
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.