Matrix properties
number of rows	3,140
number of columns	3,140
nonzeros	543,160
structural full rank?	yes
structural rank	3,140
# of blocks from dmperm	1
# strongly connected comp.	1
explicit zero entries	2
nonzero pattern symmetry	48%
numeric value symmetry	1%
type	integer
structure	unsymmetric
Cholesky candidate?	no
positive definite?	no

author	P. Slater
editor	I. Duff, R. Grimes, J. Lewis
date	1983
kind	economic problem
2D/3D problem?	no

Ordering statistics:	result
nnz(chol(P*(A+A'+s*I)*P')) with AMD	3,062,944
Cholesky flop count	4.6e+09
nnz(L+U), no partial pivoting, with AMD	6,122,748
nnz(V) for QR, upper bound nnz(L) for LU, with COLAMD	4,320,087
nnz(R) for QR, upper bound nnz(U) for LU, with COLAMD	4,887,636

Note that all matrix statistics (except nonzero pattern symmetry) exclude the 2 explicit zero entries.

SVD-based statistics:
norm(A)	2.23192e+06
min(svd(A))	0.000460734
cond(A)	4.84428e+09
rank(A)	3,140
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.