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Re: [igraph] clusters does not like empty string node names

From: Gábor Csárdi
Subject: Re: [igraph] clusters does not like empty string node names
Date: Thu, 23 Feb 2012 17:52:18 -0500

Yep, this seems to be a bug. The empty node name becomes NA, and
messes up the graph structure.


On Mon, Feb 20, 2012 at 11:34 AM, Katharina Zweig
<address@hidden> wrote:
> Dear all,
> I just found an interesting behavior of the clusters function which might be
> considered a bug. Here is the minimal code to produce the result:
>> v1 <- c("", "Anne", "Bert", "Charlotte")
>> v2 <- c("", "Bert", "Charlotte", "Anne")
>> df <- data.frame(v1, v2)
>> g <- graph.data.frame(df)
>> summary(g)
> As you can see there should be a single node with an empty string name and a
> triangle between the other three nodes but due to the empty string name of
> the first node the  clusters function thinks that all nodes are singletons.
> It seems to be independent of the order in which the 'empty' node name is
> given.  It  got worsed, when I replaced one of the empty names by a real
> string: my R GUI crashed....
> Hope that helps.
> Nina
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> igraph-help mailing list
> address@hidden
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Gabor Csardi <address@hidden>     MTA KFKI RMKI

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