Matrix properties
number of rows	1,377
number of columns	1,377
nonzeros	8,993
structural full rank?	yes
structural rank	1,377
# 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	13,897
Cholesky flop count	1.6e+05
nnz(L+U), no partial pivoting, with AMD	26,417
nnz(V) for QR, upper bound nnz(L) for LU, with COLAMD	14,348
nnz(R) for QR, upper bound nnz(U) for LU, with COLAMD	27,085

SVD-based statistics:
norm(A)	6.84566
min(svd(A))	0.00042736
cond(A)	16018.5
rank(A)	1,377
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.