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## Re: [igraph] motifs of size 4 tassonomy

 From: Simone Gabbriellini Subject: Re: [igraph] motifs of size 4 tassonomy Date: Mon, 24 Jan 2011 15:53:53 +0100

```I got it, plotting is not available on my system!

I'll try to fix that. Thanks,
Simone

Il giorno 24/gen/2011, alle ore 15.30, Tamas Nepusz ha scritto:

> Hi Simone,
>
> You're right, this is not documented properly. Item i in the result
> counts the number of motifs isomorphic to the graph with 4 vertices and
> isomorphy class i. There are 11 possible non-isomorphic undirected
> graphs of size 4, and these can be plotted as follows:
>
> for i in xrange(11):
>    plot(Graph.Isoclass(4, i), "isoclass_%d.pdf" % i, bbox=(100, 100),
> layout="circle")
>
> This snippet gives you 11 PDF files that show each of the isomorphy classes.
>
> --
> Tamas
>
> On 01/24/2011 03:24 PM, Simone Gabbriellini wrote:
>> Hello List,
>>
>> I would like to calculate a value of transitivity for an *undirected*
>> bipartite graph. I have to find the number of quadruplets of nodes with four
>> links and  the number of quadruplets of nodes with at least three. I use
>> motifs to extract the quadruplets census:
>>
>> (Python)
>> trans = g.motifs_randesu(size=4)
>>
>> but I cannot figure out the right classification for the census list. I
>> guess the first value is the number of quadruplets with no links, but how
>> exactly this classification goes on?
>>
>> thanks for any help!
>>
>> Best regards,
>> Simone
>>
>>
>>
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>>
>
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