Re: sources for dynamic networks in .dgs format

[Yoann Pigné <yoann.pigne AT gmail.com>]

Hi Christian, 


On Jan 31, 2014, at 2:06 PM, Christian Staudt 
<christian.staudt AT kit.edu>
 wrote:

> 
> Hi Yoann,
> 
>> A .dgs repository. The idea has been on the todo list for a while... maybe 
>> one day :) 
> 
> When you get to it one day, I might be able to contribute a handful of 
> real-world data sets.
> 

Thanks! I won't forget that :)

>> 
>> You can always generate artificial dynamic graphs with generators 
>> (http://graphstream-project.org/doc/Generators/), but yeah, it's only 
>> artificial…
> 
> I need large dynamic complex networks with community structure. What could 
> be suitable is the Dorogovtsev-Mendes generator. So far I’ve managed to 
> generate and display graphs, but not to store the streams in .dgs files. 
> Could you maybe give me a code example for this?
> 

This code can throw IO Exception, you'll need to try/catch or throw. If you 
want a static graph, just remove the /*g.stepBegins(i);*/ line.

Graph g = new AdjacencyListGraph("Dyn DorogovtsevMendes Graph"); 

// the file sink
FileSinkDGS sink = new FileSinkDGS();
g.addSink(sink);
sink.begin("/path/to/output-graph.dgs");

// the generator
Generator gen = new DorogovtsevMendesGenerator();
gen.addSink(g);
gen.begin();

for(int i=0; i<100; i++) {
        // generate a timestamp at each step for a dynamic graph
        g.stepBegins(i);  

        // generate some nodes and edges
        gen.nextEvents();
}
gen.end();

// Close the sink so that the file is properly written.
sink.end();


> 
>> By the way, NetworKit looks great! 
> 
> Thank you, that’s a compliment considering that it is still very much under 
> construction. Version 2.1 is due in February and will have a more complete 
> feature set and documentation. But I think it is developing into a good 
> tool if you want to do interactive analytics on large graphs. If you want 
> to try it out, don’ t hesitate to ask me for support. Any feedback is 
> greatly appreciated.
> 

Thanks again.

Best, 

Yoann