Matrix properties
number of rows	10,680
number of columns	10,680
nonzeros	48,632
# strongly connected comp.	1
explicit zero entries	0
nonzero pattern symmetry	symmetric
numeric value symmetry	symmetric
type	integer
structure	symmetric
Cholesky candidate?	no
positive definite?	no

author	M. Boguna, R. Pastor-Satorras, A. Diaz-Guillera, A. Arenas
editor	A. Arenas
date	2004
kind	undirected multigraph
2D/3D problem?	no

Additional fields	size and type
coord	full 10680-by-2

Notes:

Arenas set: PGP network                                          
http://deim.urv.cat/~aarenas/data/welcome.htm                    
                                                                 
Graph of the largest component of the network of users of the    
Pretty-Good-Privacy algorithm for secure information interchange.
Data compiled by members of Alex Arenas' group.                  
Reference: M. Boguna, R. Pastor-Satorras, A.  Diaz-Guilera and   
A. Arenas, Physical Review E, vol. 70, 056122 (2004).            

SVD-based statistics:
norm(A)	42.5992
min(svd(A))	7.93597e-58
cond(A)	5.36787e+58
rank(A)	8,078
null space dimension	2,602
full numerical rank?	no
singular value gap	6.03273e+10

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.