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 <[email protected]> wrote: > On Tue, Mar 20, 2012 at 2:20 PM, Charles Novaes de Santana > <[email protected]> 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 >> <[email protected]> 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: [email protected] >>> >>> _______________________________________________ >>> igraph-help mailing list >>> [email protected] >>> 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 >> [email protected] >> https://lists.nongnu.org/mailman/listinfo/igraph-help > > > > -- > Gabor Csardi <[email protected]> MTA KFKI RMKI > > _______________________________________________ > igraph-help mailing list > [email protected] > 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 [email protected] https://lists.nongnu.org/mailman/listinfo/igraph-help
