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## Re: [igraph] An elementary question

 From: Moses Boudourides Subject: Re: [igraph] An elementary question Date: Thu, 30 Jun 2011 21:42:20 +0200

```Thanks, Gabor. I'll try to do it next week on the boat from Italy to
Greece because tomorrow morning I'm leaving from Paris. --M

On Thu, Jun 30, 2011 at 9:31 PM, Gábor Csárdi <address@hidden> wrote:
> Moses,
>
> On Tue, Jun 28, 2011 at 11:12 AM, Moses Boudourides
>> Hello,
>>
>> I'm sorry to bother you with such a trivial question but it would save
>> me some time searching through manuals if you were able to give me
>>
>> Say I have a graph G and all vertices are associated to a binary
>> attribute which takes the values 1 and 0, i.e., for each vertex the
>> attribute is either 1 or 0.
>>
>> How would I get in igraph the following two graphs:
>>
>> (1) G1 which is what it remains from G if we DELETE ALL LINKS
>> connecting vertices with attribute 0 (but of course keeping in G1 all
>> vertices of G, although some of them now might turn out to be
>> isolated)?
>
> delete.edges(g, E(g)[ V(g)[attr == 0] %--% V(g)[attr == 0] ])
>
> 'g' is the graph, 'attr' is the name of the attribute. This might not
> be the fastest to run, but it should work. (Tell me if it does not.)
>
>> (2) G0 which is what it remains from G if we delete all links
>> connecting vertices with attribute 1 (but of course keeping all
>> vertices of G)?
>
> Similarly,
>
> delete.edges(g, E(g)[ V(g)[attr == 1] %--% V(g)[attr == 1] ])
>
> G.
>
>> Best,
>>
>> --Moses
>>
>> _______________________________________________
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>>
>
>
>
> --
> Gabor Csardi <address@hidden>     MTA KFKI RMKI
>
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