Re: [igraph] a problem with simplify()

[Simone Gabbriellini]

with as.vector() both gives me 0-based indexing.

> as.vector(V(g))
  [1]   0   1   2   3   4   5   6   7   8   9  10  11  12  13  14  15  16  17  
18  19  20  21  22  23  24  25
 [27]  26  27  28  29  30  31  32  33  34  35  36  37  38  39  40  41  42  43  
44  45  46  47  48  49  50  51

> as.vector(E(g))
  [1]   0   1   2   3   4   5   6   7   8   9  10  11  12  13  14  15  16  17  
18  19  20
 [22]  21  22  23  24  25  26  27  28  29  30  31  32  33  34  35  36  37  38  
39  40  41

I must have a not so recent 0.6.

best,
simo

Il giorno 21/ott/2010, alle ore 19.34, Gábor Csárdi ha scritto:

> 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
>> 
>> 
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> 
> 
> 
> -- 
> Gabor Csardi <address@hidden>     UNIL DGM
> 
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