Matrix properties
number of rows	420
number of columns	420
nonzeros	420
structural full rank?	yes
structural rank	420
# of blocks from dmperm	420
# strongly connected comp.	420
explicit zero entries	0
nonzero pattern symmetry	symmetric
numeric value symmetry	symmetric
type	real
structure	symmetric
Cholesky candidate?	yes
positive definite?	yes

author	J. Lewis
editor	I. Duff, R. Grimes, J. Lewis
date	1982
kind	structural problem
2D/3D problem?	yes

Ordering statistics:	result
nnz(chol(P*(A+A'+s*I)*P')) with AMD	420
Cholesky flop count	4.2e+02
nnz(L+U), no partial pivoting, with AMD	420
nnz(V) for QR, upper bound nnz(L) for LU, with COLAMD	420
nnz(R) for QR, upper bound nnz(U) for LU, with COLAMD	420

SVD-based statistics:
norm(A)	7602.41
min(svd(A))	0.00219908
cond(A)	3.45708e+06
rank(A)	420
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.