Matrix properties
number of rows	10,974
number of columns	10,974
nonzeros	428,650
structural full rank?	yes
structural rank	10,974
# of blocks from dmperm	519
# strongly connected comp.	519
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	1,043,601
Cholesky flop count	1.6e+08
nnz(L+U), no partial pivoting, with AMD	2,076,228
nnz(V) for QR, upper bound nnz(L) for LU, with COLAMD	1,515,744
nnz(R) for QR, upper bound nnz(U) for LU, with COLAMD	3,095,965

SVD-based statistics:
norm(A)	1.29606e+10
min(svd(A))	0.999998
cond(A)	1.29606e+10
rank(A)	10,974
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.