Matrix properties
number of rows	23,670
number of columns	23,670
nonzeros	259,648
structural full rank?	yes
structural rank	23,670
# of blocks from dmperm	1,157
# strongly connected comp.	597
explicit zero entries	34,328
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	5,878,121
Cholesky flop count	6.6e+09
nnz(L+U), no partial pivoting, with AMD	11,732,572
nnz(V) for QR, upper bound nnz(L) for LU, with COLAMD	6,615,944
nnz(R) for QR, upper bound nnz(U) for LU, with COLAMD	12,041,530

Note that all matrix statistics (except nonzero pattern symmetry) exclude the 34328 explicit zero entries.

SVD-based statistics:
norm(A)	9.15571e+07
min(svd(A))	3.79496e-11
cond(A)	2.4126e+18
rank(A)	17,627
sprank(A)-rank(A)	6,043
null space dimension	6,043
full numerical rank?	no
singular value gap	1.01854

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.