Re: [igraph] problems with parameters in barabasi.game()

[Csardi Gabor]

Mario, no, it is not supposed to "work" like this, this is 
a bug, possibly in igraph, possibly in the C++ code we use 
for the graph generation. Sorry about this, I'll try to correct it.

G.

On Wed, Sep 10, 2008 at 05:59:10PM +0200, Mario Lavezzi wrote:
> Gabor, thanks a lot. It seems to work but, most of the times, after 
> following your suggestions, I get a message like this:
> 
> --------------------------------------------------------------------
> *** caught segfault ***
> address (nil), cause 'memory not mapped'
> 
> Traceback:
> 1: .Call("R_igraph_degree_sequence_game", as.numeric(out.deg), 
> as.numeric(in.deg),     as.numeric(method), PACKAGE = "igraph")
> 2: degree.sequence.game(degreeSeq, method = "vl")
> 
> Possible actions:
> 1: abort (with core dump, if enabled)
> 2: normal R exit
> 3: exit R without saving workspace
> 4: exit R saving workspace
> 
> -----------------------------------------------------------
> 
> ...and have to stop..
> 
> I understand this has to do with the way R works, but I have not found 
> any useful help on this in the web
> (by the way, I use R 2.6.2 on Linux Ubuntu 8.04)
> 
> Mario
> 
> >Mario, I would try 'sample' first, e.g. 
> >
> >degs <- sample(1:1000, 1000, replace=TRUE, prob=(1:1000)^-2)
> >g <- degree.sequence.game(degs, method="vl")
> >
> >Note that it is not always possible to realize a given degree sequence,
> >e.g. if the sum of degrees is odd, then it is trivially impossible.
> >
> >G.
> >  
> -- 
> Andrea Mario Lavezzi
> Dipartimento di Studi su Politica, Diritto e Società
> Università di Palermo
> Piazza Bologni 8
> 90134 Palermo, Italy
> tel. ++39 091 6625600
> fax ++39 091 6112023
> skype: lavezzimario
> email: lavezzi (at) unipa.it
> web: http://www.unipa.it/~lavezzi
> 
> 
> 
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-- 
Csardi Gabor <address@hidden>    MTA RMKI, ELTE TTK