Matrix properties
number of rows	17,730
number of columns	17,730
nonzeros	183,325
structural full rank?	yes
structural rank	17,730
# of blocks from dmperm	877
# strongly connected comp.	457
explicit zero entries	19,991
nonzero pattern symmetry	4%
numeric value symmetry	0%
type	real
structure	unsymmetric
Cholesky candidate?	no
positive definite?	no

author	P. Hollinger
editor	T. Davis
date	2001
kind	economic problem
2D/3D problem?	no

Ordering statistics:	result
nnz(chol(P*(A+A'+s*I)*P')) with AMD	3,904,845
Cholesky flop count	3.9e+09
nnz(L+U), no partial pivoting, with AMD	7,791,960
nnz(V) for QR, upper bound nnz(L) for LU, with COLAMD	4,199,769
nnz(R) for QR, upper bound nnz(U) for LU, with COLAMD	7,452,790

Note that all matrix statistics (except nonzero pattern symmetry) exclude the 19991 explicit zero entries.

SVD-based statistics:
norm(A)	108310
min(svd(A))	1.60764e-08
cond(A)	6.73717e+12
rank(A)	17,724
sprank(A)-rank(A)	6
null space dimension	6
full numerical rank?	no
singular value gap	2.76854

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.