Matrix properties
number of rows	4,884
number of columns	4,884
nonzeros	290,378
structural full rank?	yes
structural rank	4,884
# of blocks from dmperm	75
# strongly connected comp.	75
explicit zero entries	0
nonzero pattern symmetry	symmetric
numeric value symmetry	symmetric
type	real
structure	symmetric
Cholesky candidate?	yes
positive definite?	yes

author	M. Will
editor	I. Duff, R. Grimes, J. Lewis
date	1985
kind	structural problem
2D/3D problem?	yes

Ordering statistics:	result
nnz(chol(P*(A+A'+s*I)*P')) with AMD	812,183
Cholesky flop count	1.9e+08
nnz(L+U), no partial pivoting, with AMD	1,619,482
nnz(V) for QR, upper bound nnz(L) for LU, with COLAMD	996,481
nnz(R) for QR, upper bound nnz(U) for LU, with COLAMD	2,019,675

SVD-based statistics:
norm(A)	4.94317e+09
min(svd(A))	0.999997
cond(A)	4.94318e+09
rank(A)	4,884
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.