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Re: [igraph] R: igraph: decompose.graph: Error: protect(): protection st
From: |
Tamás Nepusz |
Subject: |
Re: [igraph] R: igraph: decompose.graph: Error: protect(): protection stack overflow |
Date: |
Wed, 21 Mar 2012 21:07:23 +0100 |
> > which(sc.cl$membership == 0)
>
> [1] 1 2 92259 280860
>
> BUT:
> > subgraph(sc.gr (http://sc.gr), which(sc.cl$membership == 0))
>
> […]
> this is not a weakly connected component!
Unless you are using igraph 0.6, you were probably bitten by the off-by-one
indexing trap: node indices in igraph start from zero, but which() returns
1-based indexes, so you have to subtract 1 from the result of which().
--
T.