Matrix properties
number of rows	1,138
number of columns	1,138
nonzeros	7,450
structural full rank?	yes
structural rank	1,138
# 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	14,567
Cholesky flop count	2.4e+05
nnz(L+U), no partial pivoting, with AMD	27,996
nnz(V) for QR, upper bound nnz(L) for LU, with COLAMD	18,304
nnz(R) for QR, upper bound nnz(U) for LU, with COLAMD	34,455

SVD-based statistics:
norm(A)	6.84446
min(svd(A))	0.000582831
cond(A)	11743.5
rank(A)	1,138
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.