Matrix properties
number of rows	27,449
number of columns	27,449
nonzeros	160,723
structural full rank?	yes
structural rank	27,449
# of blocks from dmperm	961
# strongly connected comp.	961
explicit zero entries	9,972
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	5,038,771
Cholesky flop count	4.0e+09
nnz(L+U), no partial pivoting, with AMD	10,050,093
nnz(V) for QR, upper bound nnz(L) for LU, with COLAMD	7,458,742
nnz(R) for QR, upper bound nnz(U) for LU, with COLAMD	12,922,730

Note that all matrix statistics (except nonzero pattern symmetry) exclude the 9972 explicit zero entries.

SVD-based statistics:
norm(A)	2.34469e+06
min(svd(A))	4.26137e-08
cond(A)	5.50219e+13
rank(A)	27,335
sprank(A)-rank(A)	114
null space dimension	114
full numerical rank?	no
singular value gap	1.05302

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.