Re: [igraph] R igraph: get.shortest.paths returns error

[Tamás Nepusz]

Dear Tobias,  

This is strange; I still cannot reproduce your issue on my machine, neither 
with "ordinary" R vectors nor with vertex sequences. Could you send me an Rdata 
file with an example graph and a "startnode" and "tonodes" vector that causes 
problems on your machine?  

Best,--  
T.


On Wednesday, 8 August 2012 at 09:25, Tobias Heckmann wrote:

> Dear Tamas,
>  
> in the original version of my script (which worked on my old machine),
> startnode is a simple R vector:
> > str(startnode)
>  
> num 177822
>  
> while tonodes seems to be a vector sequence:
> > str(tonodes)
>  
> Class 'igraph.vs' atomic [1:286] 157812 158206 158605 158989 159367 ...
> ..- attr(*, "env")=<environment: 0x1013523c>
>  
> in ?get.shortest.paths, it reads that the "to" argument should be a  
> "numeric vector, the vertices to which the shortest paths will be  
> calculated..."
> Hence, I also tried as.numeric(tonodes) in the "to" argument, but the  
> error remains the same.
>  
> Cheers,
> Tobias
>  
> Am 08/08/2012 08:43, schrieb Tamas Nepusz:
> > Dear Tobias,
> >  
> > > Until today, the following command worked well:
> > >  
> > > paths<-get.shortest.paths(graph,from=startnode,to=tonodes,mode="out",weights=NA,output="epath")
> > >  
> > > Today, I installed R on a 64bit machine and tried running my script again.
> > > This time, the command returned the following error:
> > >  
> > > "At structural_properties.c:659 : Size of the `vertices' and the `to'
> > > should match, Invalid value"
> >  
> >  
> > I have tried this now on a random graph with random start and end nodes and
> > it seemed to work for me, so can you please let us know what is there in the
> > "startnode" and "tonodes" variables? Are they simple R vectors?
> >  
> > Cheers,
> > Tamas
> >  
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>  
>  
>  
>  
> --  
> ---
> Dr. Tobias Heckmann
> Wiss. Angestellter
> Lehrstuhl für Physische Geographie
> Katholische Universität Eichstätt-Ingolstadt
> Ostenstraße 18
> 85072 Eichstätt
>  
> Tel.: 08421-93-1309
> Fax: 08421-93-1787
>  
>  
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