[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]
## Re: [igraph] What exactly does igraph_transitivity_undirected() compute

**From**: |
Gábor Csárdi |

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

**Date**: |
Mon, 7 Dec 2015 11:56:06 +0000 |

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*
>
>* _______________________________________________*
>* igraph-help mailing list*
>* address@hidden*
>* https://lists.nongnu.org/mailman/listinfo/igraph-help*