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
entries not in dmperm blocks	3,712
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:	AMD	METIS	DMPERM+
nnz(chol(P*(A+A'+s*I)*P'))	5,878,121	4,941,838	4,877,447
Cholesky flop count	6.6e+09	3.9e+09	3.8e+09
nnz(L+U), no partial pivoting	11,732,572	9,860,006	9,734,936
nnz(V) for QR, upper bound nnz(L) for LU	6,615,944	3,491,610	3,275,286
nnz(R) for QR, upper bound nnz(U) for LU	12,041,530	8,462,362	9,127,434

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

Maintained by Tim Davis, last updated 04-May-2008.
Matrix pictures by cspy, a MATLAB function in the CSparse package.
Matrix graphs by Yifan Hu, AT&T Labs Visualization Group.