Matrix properties
number of rows	663
number of columns	663
nonzeros	1,726
structural full rank?	yes
structural rank	663
# of blocks from dmperm	663
# strongly connected comp.	4
explicit zero entries	0
nonzero pattern symmetry	0%
numeric value symmetry	0%
type	integer
structure	unsymmetric
Cholesky candidate?	no
positive definite?	no

author	M. Saunders
editor	A. Curtis, I. Duff, J. Reid
date	1978
kind	subsequent optimization problem
2D/3D problem?	no

Notes:

next: HB/shl_400 first: HB/shl_0

Ordering statistics:	result
nnz(chol(P*(A+A'+s*I)*P')) with AMD	14,839
Cholesky flop count	1.0e+06
nnz(L+U), no partial pivoting, with AMD	29,015
nnz(V) for QR, upper bound nnz(L) for LU, with COLAMD	25,618
nnz(R) for QR, upper bound nnz(U) for LU, with COLAMD	117,370

SVD-based statistics:
norm(A)	9433.87
min(svd(A))	1.09413e-05
cond(A)	8.62227e+08
rank(A)	663
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.