Matrix properties
number of rows	18,520,486
number of columns	18,520,486
nonzeros	298,113,762
# strongly connected comp.	3,887,634
explicit zero entries	0
nonzero pattern symmetry	21%
numeric value symmetry	21%
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	2002
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/uk-2002                                                              
                                                                         
This graph has been obtained from a 2002 crawl of the .uk                
domain performed by UbiCrawler.                                          
                                                                         
For additional graph properties and statistics, including node labels,   
see http://law.di.unimi.it/webdata/uk-2002                               

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.