Hi
igraph edgelist files use zero-based vertex indices, so your edgelist file
contains 1134 vertices since the highest vertex ID in the file is 1133.
Subtract 1 from every edge ID in the file and you should be okay. (However,
note that vertex indices in R start from 1, so if you have a vertex with ID=X
in your file, this will be vertex X+1 in R).
In case you wonder why edgelist files are zero-based: this is for sake of
compatibility with edgelist files created from the raw C API of igraph or from
igraph’s Python interface because those are zero-based.
--
T.
On Tuesday, 19 November 2013 at 16:00, Prithwiraj MUKHERJEE wrote:
> Hi
>
> I have attached an edgelist file "email_edges.txt". The graph has 1133
> vertices. I am reading it as
>
> G<-read.graph("email_edges.txt", format="edgelist")
>
> On checking the graph, it has 1134 vertices (one extra vertex). Is there
> something I am missing?
>
> I am using igraph's latest version (i updated it today) on R 2.15.3 (64 bit)
> for Windows 7.
>
> Regards
> Prithwiraj
>
> _______________________________________________
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>
>
>
>
> Attachments:
> - email_edges.txt
>
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