Matrix properties
number of rows	1,806
number of columns	1,806
nonzeros	63,454
structural full rank?	yes
structural rank	1,806
# of blocks from dmperm	41
# strongly connected comp.	41
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	109,078
Cholesky flop count	9.1e+06
nnz(L+U), no partial pivoting, with AMD	216,350
nnz(V) for QR, upper bound nnz(L) for LU, with COLAMD	184,239
nnz(R) for QR, upper bound nnz(U) for LU, with COLAMD	386,801

SVD-based statistics:
norm(A)	1.19232e+10
min(svd(A))	0.999998
cond(A)	1.19232e+10
rank(A)	1,806
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.