Matrix properties
number of rows	400
number of columns	400
nonzeros	2,860
structural full rank?	yes
structural rank	400
# 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	1,648
Cholesky flop count	7.8e+03
nnz(L+U), no partial pivoting, with AMD	2,896
nnz(V) for QR, upper bound nnz(L) for LU, with COLAMD	1,667
nnz(R) for QR, upper bound nnz(U) for LU, with COLAMD	2,776

SVD-based statistics:
norm(A)	5.73204
min(svd(A))	2.21131e-05
cond(A)	259215
rank(A)	400
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.