Gabor, Charles, thanks for the hints! they both work fine!
best, Simone 2012/3/20 Charles Novaes de Santana <[email protected]>: > 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 -- Dr. Simone Gabbriellini DigitalBrains srl Amministratore Head R&D mobile: +39 3403975626 mail: [email protected] _______________________________________________ igraph-help mailing list [email protected] https://lists.nongnu.org/mailman/listinfo/igraph-help
