Re: [igraph] high-'power' bug (?) in barabasi.game

[jabrunso]

Aha, in that case i can't complain too much. I'll work some  
precautions into my code. Thanks for the context!

Cory

Quoting Gábor Csárdi <address@hidden>:

> This is most probably a numerical error. Today's computers cannot
> represent numbers such as 10^250 accurately.
>
> We could probably give an error or warning message about this, if
> (say) number of nodes to the power of 'power' is larger than 1e50, or
> (even better) the largest accurately represented number.
>
> Gabor
>
> On Sat, May 26, 2012 at 3:29 PM,  <address@hidden> wrote:
> > I am trying to construct graphs using barabasi.game that form a single
> > connected component, which i thought from the construction algorithm would
> > be automatic. However, some examples have been disconnected.
> >
> > Playing with the parameters suggests that the problem only occurs when my
> > 'power' values are high, but i don't see why this should be a problem. In
> > each case the graph becomes a pair of stars with one loop at one of the
> > hubs. Here are some examples:
> >
> > > g <- barabasi.game(n = 32, power = 125, m = 1)
> > > is.connected(g)
> >
> > [1] TRUE
> > > g <- barabasi.game(n = 32, power = 250, m = 1)
> > > is.connected(g)
> >
> > [1] FALSE
> > > g <- barabasi.game(n = 16, power = 250, m = 1)
> > > is.connected(g)
> >
> > [1] TRUE
> > > g <- barabasi.game(n = 16, power = 500, m = 1)
> > > is.connected(g)
> >
> > [1] FALSE
> >
> > Thanks for any help!
> >
> > Cory
> >
> > _______________________________________________
> > igraph-help mailing list
> > address@hidden
> > https://lists.nongnu.org/mailman/listinfo/igraph-help
>
>
>
> --
> Gabor Csardi <address@hidden>     MTA KFKI RMKI
>
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