Matrix properties
number of rows	9
number of columns	9
nonzeros	50
structural full rank?	yes
structural rank	9
# of blocks from dmperm	1
# strongly connected comp.	1
explicit zero entries	0
nonzero pattern symmetry	48%
numeric value symmetry	48%
type	binary
structure	unsymmetric
Cholesky candidate?	no
positive definite?	no

author	J. Lewis
editor	I. Duff, R. Grimes, J. Lewis
date	1983
kind	counter-example problem
2D/3D problem?	no

Ordering statistics:	result
nnz(chol(P*(A+A'+s*I)*P')) with AMD	42
Cholesky flop count	2.4e+02
nnz(L+U), no partial pivoting, with AMD	75
nnz(V) for QR, upper bound nnz(L) for LU, with COLAMD	44
nnz(R) for QR, upper bound nnz(U) for LU, with COLAMD	45

SVD-based statistics:
norm(A)	6.10129
min(svd(A))	4.86173e-63
cond(A)	1.25496e+63
rank(A)	5
sprank(A)-rank(A)	4
null space dimension	4
full numerical rank?	no
singular value gap	6.02749e+15

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.