Matrix properties
number of rows	11,948
number of columns	11,948
nonzeros	149,090
structural full rank?	yes
structural rank	11,948
# of blocks from dmperm	792
# strongly connected comp.	792
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	637,035
Cholesky flop count	1.3e+08
nnz(L+U), no partial pivoting, with AMD	1,262,122
nnz(V) for QR, upper bound nnz(L) for LU, with COLAMD	1,569,721
nnz(R) for QR, upper bound nnz(U) for LU, with COLAMD	3,082,282

SVD-based statistics:
norm(A)	4.2952e+10
min(svd(A))	0.124139
cond(A)	3.46e+11
rank(A)	11,948
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.