Matrix properties
number of rows	496
number of columns	496
nonzeros	1,859
structural full rank?	yes
structural rank	496
# of blocks from dmperm	6
# strongly connected comp.	1
explicit zero entries	0
nonzero pattern symmetry	47%
numeric value symmetry	0%
type	real
structure	unsymmetric
Cholesky candidate?	no
positive definite?	no

author	G. Stewart
editor	Z. Bai, D. Day, J. Demmel, J. Dongarra
date	1978
kind	statistical/mathematical problem
2D/3D problem?	no

Ordering statistics:	result
nnz(chol(P*(A+A'+s*I)*P')) with AMD	7,606
Cholesky flop count	1.6e+05
nnz(L+U), no partial pivoting, with AMD	14,716
nnz(V) for QR, upper bound nnz(L) for LU, with COLAMD	8,263
nnz(R) for QR, upper bound nnz(U) for LU, with COLAMD	15,093

SVD-based statistics:
norm(A)	1.14682
min(svd(A))	5.74972e-11
cond(A)	1.99456e+10
rank(A)	496
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.