[igraph] Transitivity

[Thomas]

Hi,

I have the following graph:

0 -> 2
0 -> 3
1 -> 2
2 -> 3

and transitivity(g) = 0.6.

Transitivity is the ratio of the triangles and the connected triples  
in the graph, and I count one connected tripple {0,2,3} and four  
potential tripples (the triangles) {012}, {013}, {123} and {023}.

Where does the 0.6 come from please?

Thank you,

Thomas

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