Re: [igraph] as.dendrogram

[Gábor Csárdi]

Hi Simone,

based on the output this seems to be the development version of
igraph. The as.dendrogram() function has been recently rewritten, and
I don't know what exactly is causing your problem (I don't even know
which version exactly you are using), but as.dendrogram() seems to
work fine on the output of walktrap.community() in the latest version.

The latest version, however, has 1-based vertex/edge indexing, and
will probably break some of your code.

Sorry about this,
Gabor

On Thu, Nov 4, 2010 at 12:20 PM, Simone Gabbriellini
<address@hidden> wrote:
> Hello List,
>
> I have found communities in my graph through the walktrap.community function. 
> Here's the result:
>
>> mywalktrap
> Graph community structure calculated with the walktrap algorithm
> Number of communities (best split): 27
> Modularity (best split): 0.8075689
> Membership vector:
>  [1]  1 19  1  1 10 12 10  0  8 11 15 11 11  1  4  1  1 11 20  1 12  7  1 13 
> 11 18  6 11 12
>  [30]  1  5 13 16  1  6 16 21  1  3  1  1  1 13  1 12  3  5  2 26  0 17  2  6 
>  1  1 11  5 25
>  [59]  0  0 20 20  5 11  6 11 13  1  8 24 11  5  1  4  0  6 19 13  3 14  1  6 
> 13 20  4 13  0
>  [88]  1  1  1 11  1  1  4  5  5 12 14  0  8  5  8  1  2 19  3  3  1  1  3 10 
> 23  1  5 13  5
> [117]  1 18 14  7  3  1  2  4 11  0  8  1  1 14 12 21  1 12  5  1  0  1 12 11 
>  1 17 11 11  1
> [146] 18 13  4  1  0 12  3 12  1  0 14  9  1  5 22 18  0  1  3  2 22 14  1  1 
>  1  6  4  9  8
> [175] 14  3 12  1  8 13 25  1  1  8  1  8  3 11 13 13 19 24 15 13 13 14  7  0 
>  1 11  1  2 12
> [204] 17  0  1 13 15  6  0  5 13  1  3 11  1  2  5 14 12 22 26 20  1  1  3  1 
>  8  6  6  0 11
> [233] 19  3  1 12 15  1 17 13  1  7  1 21 12  3  1 12 13 15 12 17  1 11  5  0 
>  0  9 11 11  3
> [262] 12 16  5  1 11  1  0  3 11  1 23 11 12 13  5  5 15  3  8 12 13 15  1  5 
>  1 12
>
> maybe I don't understand well the dendrogram structure, but when I call 
> as.dendrogram I obtain:
>
>> as.dendrogram(mywalktrap)
> 'dendrogram' with 2 branches and 2 members total, at height 286
>
> which is not really helpful once plotted...
>
> Am I missing something?
>
> thanks in advance for any help!
>
> best,
> simone
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>



-- 
Gabor Csardi <address@hidden>     UNIL DGM