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## Re: [igraph] Nodes at a given distance

 From: Gabor Csardi Subject: Re: [igraph] Nodes at a given distance Date: Fri, 25 Jul 2008 06:56:35 -0500 User-agent: Mutt/1.5.17+20080114 (2008-01-14)

```Hmmmm, I didn't write the Python interface, but you're right,
it seems that this function is not exported to Python.

Alternatively, you can just calculate shortest paths to all
vertices from the given vertex, and take the ones that are at
the desired distance.

Best,
G.

On Fri, Jul 25, 2008 at 12:26:23PM +0200, Marco wrote:
> Yup, As long as the object returned by neighborhood is a set and not
> something esoteric.
>
> BTW, i have "import igraph"-ed but i can't find the function neighborhood.
> Any hints? :)
>
> Thanks again and again,
>
> m
>
>
>
> On Fri, Jul 25, 2008 at 12:10 PM, Gabor Csardi <address@hidden> wrote:
> > http://en.wikibooks.org/wiki/Python_Programming/Sets#Set_Difference
> >
> > seems to be good enough.
> >
> > G.
> >
> > On Fri, Jul 25, 2008 at 12:05:40PM +0200, Marco wrote:
> >> Oh, ok!
> >>
> >> I am using just python+igraph, that's why i was unable to find the
> >> setdiff. :)
> >>
> >> I guess that now that i know what setdiff does, i can find or write
> >> something that does the same in python.
> >>
> >> thanks again,
> >>
> >> marco
> >>
> >>
> >> On Fri, Jul 25, 2008 at 11:59 AM, Gabor Csardi <address@hidden> wrote:
> >> > Marco, do you actually use R? If yes, see ?setdiff.
> >> >
> >> > setdiff is an R function, it is the difference operation between
> >> > two sets, it calculates the elements that are in the first set,
> >> > but not in the second. Maybe there is something similar in Python,
> >> > but you'll have to write it for yourself if you use C. It is not
> >> > hard, just sort both vectors and go over them once to keep the elements
> >> > that are in the first vector only. As always, using a higher level
> >> > language is easier.
> >> >
> >> > Best,
> >> > Gabor
> >> >
> >> > On Fri, Jul 25, 2008 at 11:54:45AM +0200, Marco wrote:
> >> >> Hi,
> >> >>
> >> >> it sounded too great to work straight away: one stupid question arises.
> >> >> What is setdiff? :|
> >> >>
> >> >> thanks and sorry,
> >> >>
> >> >> marco
> >> >>
> >> >>
> >> >>
> >> >> --
> >> >> è il gioco della vita,
> >> >> la dobbiamo preparare
> >> >> che non ci sfugga dalle dita
> >> >> come la sabbia in riva al mare.
> >> >>
> >> >> Lucio Dalla
> >> >>
> >> >>
> >> >> _______________________________________________
> >> >> igraph-help mailing list
> >> >> http://lists.nongnu.org/mailman/listinfo/igraph-help
> >> >
> >> > --
> >> > Csardi Gabor <address@hidden>    UNIL DGM
> >> >
> >> >
> >> > _______________________________________________
> >> > igraph-help mailing list
> >> > http://lists.nongnu.org/mailman/listinfo/igraph-help
> >> >
> >>
> >>
> >>
> >> --
> >> è il gioco della vita,
> >> la dobbiamo preparare
> >> che non ci sfugga dalle dita
> >> come la sabbia in riva al mare.
> >>
> >> Lucio Dalla
> >>
> >>
> >> _______________________________________________
> >> igraph-help mailing list
> >> http://lists.nongnu.org/mailman/listinfo/igraph-help
> >
> > --
> > Csardi Gabor <address@hidden>    UNIL DGM
> >
> >
> > _______________________________________________
> > igraph-help mailing list
> > http://lists.nongnu.org/mailman/listinfo/igraph-help
> >
>
>
>
> --
> è il gioco della vita,
> la dobbiamo preparare
> che non ci sfugga dalle dita
> come la sabbia in riva al mare.
>
> Lucio Dalla
>
>
> _______________________________________________
> igraph-help mailing list