Matrix properties
number of rows	18,289
number of columns	18,289
nonzeros	106,803
structural full rank?	yes
structural rank	18,289
# of blocks from dmperm	641
# strongly connected comp.	641
explicit zero entries	6,632
nonzero pattern symmetry	7%
numeric value symmetry	1%
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	2,834,641
Cholesky flop count	1.8e+09
nnz(L+U), no partial pivoting, with AMD	5,650,993
nnz(V) for QR, upper bound nnz(L) for LU, with COLAMD	3,913,346
nnz(R) for QR, upper bound nnz(U) for LU, with COLAMD	6,558,876

Note that all matrix statistics (except nonzero pattern symmetry) exclude the 6632 explicit zero entries.

SVD-based statistics:
norm(A)	2.34469e+06
min(svd(A))	4.25863e-08
cond(A)	5.50573e+13
rank(A)	18,223
sprank(A)-rank(A)	66
null space dimension	66
full numerical rank?	no
singular value gap	1.05567

singular values (MAT file):	click here
SVD method used:	s = svd (full (R)) ; where [~,R,E] = spqr (A) with droptol of zero
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.