Matrix properties
number of rows	20,614
number of columns	20,614
nonzeros	111,903
structural full rank?	yes
structural rank	20,614
# of blocks from dmperm	2,774
# strongly connected comp.	2,754
explicit zero entries	15,279
nonzero pattern symmetry	0%
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

Additional fields	size and type
b	full 20614-by-1
x	full 20614-by-1

Ordering statistics:	result
nnz(chol(P*(A+A'+s*I)*P')) with AMD	978,309
Cholesky flop count	3.2e+08
nnz(L+U), no partial pivoting, with AMD	1,936,004
nnz(V) for QR, upper bound nnz(L) for LU, with COLAMD	1,103,778
nnz(R) for QR, upper bound nnz(U) for LU, with COLAMD	2,920,225

Note that all matrix statistics (except nonzero pattern symmetry) exclude the 15279 explicit zero entries.

SVD-based statistics:
norm(A)	261.147
min(svd(A))	3.86019e-05
cond(A)	6.76514e+06
rank(A)	20,614
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 (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.