Re: [igraph] subgraph by passing list of nodes that grabs also nodes pointing to that list

[Jose Quesada]

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Hi Gabor,



Gábor Csárdi wrote:
> Jose,
> 
> there are many ways to do this, perhaps the simplest is to use
> neighborhood() to collect the neighboring vertices and then call
> subgraph().
> 
> vv <- neighborhood(g, order=1, nodes=mynodes, mode="in")
> subgraph(g, unique(unlist(vv)))
> 

The problem with this solution is that it doesn't keep the edges.
Subgraph returns only the vertices. I cannot think of a case where I'd
need the vertices and not the edges.
Is there any way to do what subgraph does, but keeping the edges?

Thanks!


Best,
- -Jose

> Best,
> Gabor
> 
> On Wed, May 13, 2009 at 7:55 AM, Jose Quesada <address@hidden> wrote:
>> Hi igraph help,
>>
>> I have a large bipartite network. It's hard to see what's going on, so I
>> would want to do a sizeable, but manageable, subset. Something I can
>> plot. For this, I want the nodes I set, plus nodes pointing at them. Is
>> there any way to do this? I'm thinking about something like subgraph but
>> passing a list of nodes grabs also nodes pointing to that list.
>>
>> Is this possible? Thanks
>>
>>
>> Best,
>> -Jose
>>
>> --
>> Jose Quesada, PhD.
>> Max Planck Institute,
>> Center for Adaptive Behavior and Cognition -ABC-,
>> Lentzeallee 94, office 224, 14195 Berlin
>> http://www.josequesada.name/
>>
>>
>>
>> _______________________________________________
>> igraph-help mailing list
>> address@hidden
>> http://lists.nongnu.org/mailman/listinfo/igraph-help
>>
> 
> 
> 

- --
Jose Quesada, PhD.
Max Planck Institute,
Center for Adaptive Behavior and Cognition -ABC-,
Lentzeallee 94, office 224, 14195 Berlin
http://www.josequesada.name/
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