Re: [igraph] How to get neighborhood info using igraph in R

[Csardi Gabor]

Amit, this will probably do it. You didn't tell whether 
you have tabulator or spaces in the file, hopefully 
the format is not sensitive to this.

g <- erdos.renyi.game(100, 2/100)
adj <- get.adjlist(g)
out <- file("/tmp/output.nei", open="w")
cat("Node\tNo of neighbors\tList of neighbors\n", file=out)
lapply(seq_along(adj), function(x) { 
   cat(x, "\t", length(adj[[x]]), "\t\t", sep="", file=out)
   cat(adj[[x]], sep="  ", file=out)
   cat("\n", file=out)
})
close(out)

Best,
Gabor

On Mon, Sep 08, 2008 at 02:28:19PM +0100, Amit Kumar wrote:
> Hello,
> I am using igraph in R to generate networks. I used erdos.renyi.game(100,
> 2/100) to generate a random graph.
> Now, I need neighbourhood info from this graph as output (*.nei or *.txt)
> which should look like as follows:-
> 
> Node          No of neighbours          List of neighbours
> 1                       2                              21   27
> 2                       5                              11   20  23  9  8
> -                        -                               --
> -                        -                               --
> -                        -                               --
> -                        -                               --
> 100                   4                              89  78  77  34
> 
> I am newbie. Please be kind and help.
> 
> regards
> Amit

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-- 
Csardi Gabor <address@hidden>    MTA RMKI, ELTE TTK