Matrix properties
number of rows	656
number of columns	656
nonzeros	3,884
structural full rank?	yes
structural rank	656
# of blocks from dmperm	2
# strongly connected comp.	2
explicit zero entries	0
nonzero pattern symmetry	99%
numeric value symmetry	0%
type	real
structure	unsymmetric
Cholesky candidate?	no
positive definite?	no

author	J. Cullum
editor	Z. Bai, D. Day, J. Demmel, J. Dongarra
date	1986
kind	2D/3D problem
2D/3D problem?	yes

Ordering statistics:	result
nnz(chol(P*(A+A'+s*I)*P')) with AMD	2,288
Cholesky flop count	9.4e+03
nnz(L+U), no partial pivoting, with AMD	3,920
nnz(V) for QR, upper bound nnz(L) for LU, with COLAMD	2,307
nnz(R) for QR, upper bound nnz(U) for LU, with COLAMD	3,800

SVD-based statistics:
norm(A)	5.73204
min(svd(A))	5.15778e-06
cond(A)	1.11134e+06
rank(A)	656
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.