Re: [igraph] What exactly does igraph_transitivity_undirected() compute for directed graphs?

[Gábor Csárdi]

It's because of the multiple edges in the first graph. I.e.:

> transitivity(as.undirected(g, mode = "each"),"local")
[1] 0.3333333 0.3333333 1.0000000

Gabor

On Mon, Dec 7, 2015 at 10:05 AM, Szabolcs Horvát <address@hidden> wrote:
> Hello,
>
> What precisely does igraph_transitivity_undirected() compute for
> directed graphs?
>
> The C documentation states that
>
> "Directed graphs are considered as undirected ones."
>
> but this is not exactly the case.
>
> With an example using the R interface (for simplicity),
>
>> g<-make_graph(c(1,2, 2,1, 2,3, 3,1))
>> transitivity(g,"local")
> [1] 0.3333333 0.3333333 1.0000000
>
>> transitivity(as.undirected(g),"local")
> [1] 1 1 1
>
> Can someone clarify what precisely is computed in the directed case?
>
> Szabolcs
>
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