betweenness

Betweenness.js
=================

Determines the [_betweenness centrality_][betweenness] values of a
graph using Brandes' algorithm [On variants of shortest-path betweenness centrality and their generic computation \[2008\]][paper].

Usage
-----
``js
var nodes = [
{ id: 0, outEdges: [ 1 ] },
{ id: 1 } ];

var betweenness = require("betweenness");
betweenness.vertex().nodes(nodes).calc();
`

Install
-------
`bash
npm install betweenness
`

Supported Betweenness Types
---------------------------
Type | Implementation | Description
----- | --------------- | -----------
Vertex Betweenness | vertex() | Classic shortest-path betweenness, the score of v equals the number of shortest paths v lies on.
Vertex Betweenness with Endpoints | vertexWithEndpoints() | Same as before, adds to the score of a v the number of vertices that can be reached by v and that reach v.
Edge Betweenness | edge() | The score of an edge e is the number of shortest paths e` is part of.

In Brandes' paper more variants are listed and
it is easy to add them to the implementation.
If you miss a variation feel free to add it.

[betweenness]: http://en.wikipedia.org/wiki/Betweenness_centrality
[paper]: http://www.inf.uni-konstanz.de/algo/publications/b-vspbc-08.pdf