Re: [igraph] reading weighted graph with edgelist format

[Gábor Csárdi]

The NCOL format has some nasty bugs in the 0.5.3 version IFAIK, but
you can just read the file with scan(), create a matrix from it with
matrix() and then use graph.data.frame():

el <- matrix(scan("filename"), byrow=TRUE, ncol=3)
g <- graph.data.frame(as.data.frame(el))

Best,
Gabor

On Thu, Jun 24, 2010 at 9:52 AM, Tamas Nepusz <address@hidden> wrote:
>> Can edgelist format read a weighted graph from a file consists of 3 columns, 
>> with weights on the 3rd column?
> Yes, it is called the NCOL format. (Pass format="ncol" to read.graph). In the 
> case of the NCOL format, you can use names instead of vertex IDs in the first 
> and second columns; vertex names will be assigned to the "name" vertex 
> attribute and edge weights will be assigned to the "weight" edge attribute.
>
> --
> Tamas
>
>
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-- 
Gabor Csardi <address@hidden>     UNIL DGM