Re: [igraph] Node numbering

[Gábor Csárdi]

No, it is not a mistake. In R nodes are numbered from 1, but in the 'edgelist' file format they are numbered from zero. This is to make sure that files are handled the same way between C, R and Python and also to make sure that old files work the same way in the new version.

In brief, this is a property of the 'edgelist' file format.

Gabor

On Thu, Mar 14, 2013 at 9:15 AM, Thomas <address@hidden> wrote:

I've just upgraded to igraph 0.6, running it in R and with the following edgelist I get the following degrees:

1  2
1  3
1  4
1  5
1  6
1  7
1  8
1  9
1  10
g <- read.graph("edgelist2.txt", format=c("edgelist"), directed=FALSE)

degree(g)
 [1] 0 9 1 1 1 1 1 1 1 1 1

So it looks like it's still expecting Node 0 in the edgelist. Is this a mistake?

Thank you,

Thomas
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Gabor Csardi <address@hidden>     MTA KFKI RMKI