Matrix properties
number of rows	3,466
number of columns	3,466
nonzeros	23,896
structural full rank?	yes
structural rank	3,466
# 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	84,901
Cholesky flop count	3.8e+06
nnz(L+U), no partial pivoting, with AMD	166,336
nnz(V) for QR, upper bound nnz(L) for LU, with COLAMD	124,668
nnz(R) for QR, upper bound nnz(U) for LU, with COLAMD	232,398

SVD-based statistics:
norm(A)	6.99089
min(svd(A))	0.000155895
cond(A)	44843.7
rank(A)	3,466
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.