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Re: [igraph] a problem with simplify()
From: |
Gábor Csárdi |
Subject: |
Re: [igraph] a problem with simplify() |
Date: |
Thu, 21 Oct 2010 19:34:18 +0200 |
On Thu, Oct 21, 2010 at 7:21 PM, Simone Gabbriellini
<address@hidden> wrote:
> Thanks Tamas, Gabor
>
> actually, I should have the 1-based vertex indexing. BTW, the edge indexing
> is 0-based, right?
No. Either both vertex and edge ids are indexed from zero (0.5 branch)
or both of them are indexed from one (recent 0.6 branch).
>> V(g)
> Vertex sequence:
> [1] "user138" "user300" "user301" "user290" "user93" "user145" "user223"
> "user96" "user148" "user154"
> [11] "user152" "user467" "user104" "user317" "user111" "user143" "user292"
> "user91" "user31" "user90"
This is misleading, try
as.vector(V(g))
Gabor
>
>> E(g)
> Edge sequence:
>
> [0] user85 -> user85
> [1] user33 -> user33
>
>
> best,
> simone
>
> Il giorno 21/ott/2010, alle ore 19.06, Tamas Nepusz ha scritto:
>
>>> Definitely, because your code does not take into account that edges are
>>> reindexed after every deletion. I'd go for delete.edges(g, seq(0,
>>> ecount(g)-1)[is.loop(g)])
>> Or, even better: delete.edges(g, which(is.loop(g))-1) if your igraph version
>> uses 0-based indexing. Note that the R interface of igraph 0.6 has recently
>> switched to 1-based indexing, so if you installed igraph 0.6 in the last few
>> days, you don't have to subtract 1.
>>
>> --
>> T.
>>
>>
>> _______________________________________________
>> igraph-help mailing list
>> address@hidden
>> http://lists.nongnu.org/mailman/listinfo/igraph-help
>
>
> _______________________________________________
> igraph-help mailing list
> address@hidden
> http://lists.nongnu.org/mailman/listinfo/igraph-help
>
--
Gabor Csardi <address@hidden> UNIL DGM
- [igraph] a problem with simplify(), Simone Gabbriellini, 2010/10/21
- Re: [igraph] a problem with simplify(), Gábor Csárdi, 2010/10/21
- Re: [igraph] a problem with simplify(), Simone Gabbriellini, 2010/10/21
- Re: [igraph] a problem with simplify(), Tamas Nepusz, 2010/10/21
- Re: [igraph] a problem with simplify(), Tamas Nepusz, 2010/10/21
- Re: [igraph] a problem with simplify(), Gábor Csárdi, 2010/10/21
- Re: [igraph] a problem with simplify(), Simone Gabbriellini, 2010/10/21
- Re: [igraph] a problem with simplify(),
Gábor Csárdi <=
- Re: [igraph] a problem with simplify(), Simone Gabbriellini, 2010/10/21