%-------------------------------------------------------------------------------
% SuiteSparse Matrix Collection, Tim Davis
% https://sparse.tamu.edu/SNAP/email-Eu-core-temporal
% name: SNAP/email-Eu-core-temporal
% [SNAP network: email-EU-core-temporal network]
% id: 2785
% date: 2017
% author: A. Paranjape, A. R. Benson, and J. Leskovec
% ed: J. Leskovec
% fields: name title A id date author ed kind notes aux
% aux: temporal_edges Dept Dept_temporal_edges
% kind: directed temporal multigraph
%-------------------------------------------------------------------------------
% notes:
% SNAP (Stanford Network Analysis Platform) Large Network Dataset Collection,
% Jure Leskovec and Anrej Krevl, http://snap.stanford.edu/data, June 2014.   
% email: jure at cs.stanford.edu                                             
%                                                                            
% email-Eu-core temporal network                                             
%                                                                            
% https://snap.stanford.edu/data/email-Eu-core-temporal.html                 
%                                                                            
% Dataset information                                                        
%                                                                            
% The network was generated using email data from a large European research  
% institution. We have anonymized information about all incoming and outgoing
% email between members of the research institution. The e-mails only        
% represent communication between institution members (the core), and the    
% dataset does not contain incoming messages from or outgoing messages to the
% rest of the world. A directed edge (u, v, t) means that person u sent an   
% e-mail to person v at time t. A separate edge is created for each recipient
% of the e-mail. We also have four sub-networks corresponding to the         
% communication between members of four different departments at the         
% institution. Node IDs in the sub-networks do not correspond to the same    
% node ID in the entire network.                                             
%                                                                            
% The static version of this network is the same as the largest weakly       
% connected component of the email-Eu-core network                           
% (https://snap.stanford.edu/data/email-Eu-core.html) (although the node IDs 
% are not the same).                                                         
%                                                                            
% Dataset statistics (email-Eu-core-temporal)                                
% Nodes   986                                                                
% Temporal Edges  332,334                                                    
% Edges in static graph   24,929                                             
% Time span   803 days                                                       
%                                                                            
% Dataset statistics (email-Eu-core-temporal-Dept1)                          
% Nodes   309                                                                
% Temporal Edges  61,046                                                     
% Edges in static graph   3,031                                              
% Time span   803 days                                                       
%                                                                            
% Dataset statistics (email-Eu-core-temporal-Dept2)                          
% Nodes   162                                                                
% Temporal Edges  46,772                                                     
% Edges in static graph   1,772                                              
% Time span   803 days                                                       
%                                                                            
% Dataset statistics (email-Eu-core-temporal-Dept3)                          
% Nodes   89                                                                 
% Temporal Edges  12,216                                                     
% Edges in static graph   1,506                                              
% Time span   802 days                                                       
%                                                                            
% Dataset statistics (email-Eu-core-temporal-Dept4)                          
% Nodes   142                                                                
% Temporal Edges  48,141                                                     
% Edges in static graph   1,375                                              
% Time span   803 days                                                       
%                                                                            
% Source (citation)                                                          
% Ashwin Paranjape, Austin R. Benson, and Jure Leskovec. "Motifs in Temporal 
% Networks." In Proceedings of the Tenth ACM International Conference on Web 
% Search and Data Mining, 2017.                                              
%                                                                            
% Files                                                                      
% File    Description                                                        
% email-Eu-core-temporal.txt.gz                                              
%     All e-mails between members of the institution                         
% email-Eu-core-temporal-Dept1.txt.gz                                        
%     All e-mails between members of Department 1 at the institution         
% email-Eu-core-temporal-Dept2.txt.gz                                        
%     All e-mails between members of Department 2 at the institution         
% email-Eu-core-temporal-Dept3.txt.gz                                        
%     All e-mails between members of Department 3 at the institution         
% email-Eu-core-temporal-Dept4.txt.gz                                        
%     All e-mails between members of Department 4 at the institution         
%                                                                            
% Data format                                                                
%                                                                            
%     SRC DST UNIXTS                                                         
%     where edges are separated by a new line and                            
%     SRC: id of the source node (a user)                                    
%     TGT: id of the target node (a user)                                    
%     TS: timestamp (in seconds), starting from 0                            
%                                                                            
% ---------------------------------------------------------------------------
% Notes on inclusion into the SuiteSparse Matrix Collection, July 2018:      
% ---------------------------------------------------------------------------
%                                                                            
% The graphs in the SNAP data set are 0-based, with nodes numbered 0         
% to n-1 for each graph.                                                     
%                                                                            
% In the SuiteSparse Matrix Collection, Problem.A is the static graph        
% of all 1005 members where A(i,j) is the number of emails that              
% person 1+i sent to person 1+j (1+ offset in the MATLAB matrix since        
% the SNAP graph is 0-based), for all time.  Problem.aux.temporal_edges      
% is a dense 332,334-by-3 matrix where each edge is a row in the             
% matrix, with source, target, and timestamp (starting from time = 0).       
%                                                                            
% Problem.aux.Dept{1:4} is a cell array of each departmental static          
% graph.  Problem.aux.Dept_temporal_edges{1:4} has the temporal              
% edges of each departmental graph.                                          
%                                                                            
% The Problem.A and Problem.aux.Dept{1:4} matrices are larger than           
% the # of nodes listed above, to preserve the node numbers of               
% the largest weakly component as provided in the SNAP data set.             
%                                                                            
% Since the networks in the SuiteSparse Matrix Collection are all            
% 1-based, the temporal edges are (1+i,1+j,t) for each SNAP                  
% temporal edge (i,j,t), which is 0-based.                                   
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