Matrix properties
number of rows	1,561
number of columns	1,561
nonzeros	10,681
structural full rank?	yes
structural rank	1,561
# 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	thermal problem
2D/3D problem?	yes

Ordering statistics:	result
nnz(chol(P*(A+A'+s*I)*P')) with AMD	31,261
Cholesky flop count	9.8e+05
nnz(L+U), no partial pivoting, with AMD	60,961
nnz(V) for QR, upper bound nnz(L) for LU, with COLAMD	43,961
nnz(R) for QR, upper bound nnz(U) for LU, with COLAMD	80,643

SVD-based statistics:
norm(A)	6.98008
min(svd(A))	0.000366746
cond(A)	19032.4
rank(A)	1,561
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.