Matrix properties
number of rows	485
number of columns	485
nonzeros	3,135
structural full rank?	yes
structural rank	485
# of blocks from dmperm	4
# strongly connected comp.	4
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	1984
kind	structural problem
2D/3D problem?	yes

Ordering statistics:	result
nnz(chol(P*(A+A'+s*I)*P')) with AMD	2,336
Cholesky flop count	1.4e+04
nnz(L+U), no partial pivoting, with AMD	4,187
nnz(V) for QR, upper bound nnz(L) for LU, with COLAMD	2,448
nnz(R) for QR, upper bound nnz(U) for LU, with COLAMD	4,362

SVD-based statistics:
norm(A)	1.26152e+16
min(svd(A))	3240.77
cond(A)	3.89266e+12
rank(A)	485
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.