Matrix properties
number of rows	69,244
number of columns	69,244
nonzeros	276,143
# strongly connected comp.	60,916
explicit zero entries	0
nonzero pattern symmetry	15%
numeric value symmetry	15%
type	binary
structure	unsymmetric
Cholesky candidate?	no
positive definite?	no

author	Laboratory for Web Algorithmics (LAW), Universita degli Studi di Milano, http://law.di.unimi.it/index.php
editor	Laboratory for Web Algorithmics (LAW), Universita degli Studi di Milano, http://law.di.unimi.it/index.php
date	2004
kind	directed graph
2D/3D problem?	no

Notes:

Laboratory for Web Algorithmics (LAW), Universita degli Studi di Milano, 
http://law.di.unimi.it/index.php.  When using matrices in the LAW/ group 
in the collection, please follow the citation instructions at            
http://law.di.unimi.it/datasets.php.  If you publish results based on    
these graphs, please acknowledge the usage of WebGraph and LLP by quoting
the following papers:                                                    
                                                                         
[1] "The WebGraph Framework I: Compression Techniques," Paolo Boldi      
    and Sebastiano Vigna, Proc. of the Thirteenth International          
    World Wide Web Conference (WWW 2004), 2004, Manhattan, USA,          
    pp. 595--601, ACM Press.                                             
                                                                         
[2] "Layered Label Propagation: A MultiResolution Coordinate-Free        
    Ordering for Compressing Social Networks," Paolo Boldi, Marco        
    Rosa, Massimo Santini, and Sebastiano Vigna, Proceedings of the      
    20th international conference on World Wide Web, 2011, ACM Press.    
                                                                         
If the graphs you are using were gathered by UbiCrawler, please          
acknowledge the usage of UbiCrawler by quoting the following paper:      
                                                                         
[3] "UbiCrawler: A Scalable Fully Distributed Web Crawler",              
    Paolo Boldi, Bruno Codenotti, Massimo Santini, and Sebastiano        
    Vigna, Software: Practice & Experience, 2004, vol 34, no. 8,         
    pp. 711--726                                                         
                                                                         
LAW/enron                                                                
                                                                         
This dataset was made public by the Federal Energy Regulatory            
Commission during its investigations: it is a partially                  
anonymised corpus of e-mail messages exchanged by some Enron             
employees (mostly part of the senior management). We turned              
this dataset into a directed graph, whose nodes represent                
people and with an arc from x to y whenever y was the                    
recipient of (at least) a message sent by x.                             
                                                                         
For additional graph properties and statistics, including node labels,   
see http://law.di.unimi.it/webdata/enron                                 

For a description of the statistics displayed above, click here.

Maintained by Tim Davis, last updated 09-Mar-2015.
Matrix pictures by cspy, a MATLAB function in the CSparse package.
Matrix graphs by Yifan Hu, AT&T Labs Visualization Group.