Degree sequence game segfault, was: Re: [igraph] problems with parameters in barabasi.game()

[Csardi Gabor]

Mario, please read this for a workaround:

http://lists.gnu.org/archive/html/igraph-help/2008-09/msg00083.html

Gabor

On Wed, Sep 10, 2008 at 06:12:37PM +0200, Csardi Gabor wrote:
> 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
> 
> 
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-- 
Csardi Gabor <address@hidden>    MTA RMKI, ELTE TTK