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Re: [igraph] basic question on selecting a vertex


From: Charles Novaes de Santana
Subject: Re: [igraph] basic question on selecting a vertex
Date: Tue, 20 Mar 2012 19:38:53 +0100

hehehe Exactly! Thanks for the correction, Gábor! :)

But I am impressed with the way you suggested before! Igraph 0.6
really simplify our life a lot!!

Charles

On Tue, Mar 20, 2012 at 7:22 PM, Gábor Csárdi <address@hidden> wrote:
> On Tue, Mar 20, 2012 at 2:20 PM, Charles Novaes de Santana
> <address@hidden> wrote:
>> Hi Simone,
>>
>> Considering you have the names of your vertices in a variable named
>> "vertices", in a very straightforward way you could do:
>>
>> v1<-which(vertices=="this");
>> v2<-which(vertices=="that");
>> g<-add.edges(g,c(v1,v2));
>
> This is good, except that you need to subtract one, because vertices
> are numbered from zero.
>
> G.
>
>> So, the R function you are looking for is called "which".
>>
>> Surely there are other (more elegant) ways to do it, but that is the
>> one I remember now.
>>
>> All the best,
>>
>> Charles
>>
>> On Tue, Mar 20, 2012 at 6:59 PM, Simone Gabbriellini
>> <address@hidden> wrote:
>>> Dear List,
>>>
>>> sorry for this very basic question, but I am trying to select a vertex
>>> based on the value of an attribute. I forgot the R syntax, and I got
>>> lost trying to pick it up again...
>>>
>>> I would like to create an edge between two nodes for which I only know
>>> the value of the attribute, like:
>>>
>>> add.edges(g, c( the-ID-of-vertex-with-name=="this",
>>> the-ID-of-vertex-with-name=="that"))
>>>
>>> can you please advice?
>>>
>>> Best,
>>> Simone
>>>
>>> --
>>> Dr. Simone Gabbriellini
>>>
>>> DigitalBrains srl
>>> Amministratore
>>>
>>> mobile: +39 3403975626
>>> mail: address@hidden
>>>
>>> _______________________________________________
>>> igraph-help mailing list
>>> address@hidden
>>> https://lists.nongnu.org/mailman/listinfo/igraph-help
>>
>>
>>
>> --
>> Um axé! :)
>>
>> --
>> Charles Novaes de Santana
>> http://www.imedea.uib-csic.es/~charles
>> PhD student - Global Change
>> Laboratorio Internacional de Cambio Global
>> Department of Global Change Research
>> Instituto Mediterráneo de Estudios Avanzados(CSIC/UIB)
>> Calle Miquel Marques 21, 07190
>> Esporles - Islas Baleares - España
>>
>> Office phone - +34 971 610 896
>> Cell phone - +34 660 207 940
>>
>> _______________________________________________
>> igraph-help mailing list
>> address@hidden
>> https://lists.nongnu.org/mailman/listinfo/igraph-help
>
>
>
> --
> Gabor Csardi <address@hidden>     MTA KFKI RMKI
>
> _______________________________________________
> igraph-help mailing list
> address@hidden
> https://lists.nongnu.org/mailman/listinfo/igraph-help



-- 
Um axé! :)

--
Charles Novaes de Santana
http://www.imedea.uib-csic.es/~charles
PhD student - Global Change
Laboratorio Internacional de Cambio Global
Department of Global Change Research
Instituto Mediterráneo de Estudios Avanzados(CSIC/UIB)
Calle Miquel Marques 21, 07190
Esporles - Islas Baleares - España

Office phone - +34 971 610 896
Cell phone - +34 660 207 940



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