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

[Tobias Heckmann]

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