Re: [igraph] trying to understand edge betweeness community detection implemented in igraph (re-send)

[Gábor Csárdi]

Ok, I don't have time to check this carefully, but a quick tip: igraph
numbers vertices from zero, so with this input file you will have an
isolate vertex in your graph (#0), could you try to subtract one from
the numbers in your edge list file?

G.

On Fri, May 22, 2009 at 7:30 AM, Enzo Tagliazucchi <address@hidden> wrote:
> Dear Gabor,
>
> I've tested this code in Ubuntu linux (version 8.04) and in Kubuntu linux
> (version 7.10, recently updated to latest version).
>
> I compile the code using:
>
> gcc community.c -I/usr/local/include/igraph  -L/usr/local/lib -ligraph
>
> I just updated gcc to the latest version - the problem persists (according
> to ubuntu's package manager, the version is 4:4.2.3-1ubuntu6).
>
> The igraph version I'm using is 0.5.2.
>
> In the attachments you'll find the karate graph I'm using, and the code I'm
> using (the one which generates the weird community values).
>
> I've checked and cross-checked everything as much as I could. I might be
> overlooking something or making some stupid mistake, I hope this isn't the
> case...
>
> (no problem about the delay, this is by no means urgent, I just need to get
> it working from here to some time in the future)
>
> thanks a lot, again!
>
> Enzo
>
>
>
>
>
>
>
> On Fri, May 22, 2009 at 1:08 AM, Gábor Csárdi <address@hidden> wrote:
>>
>> Enzo, I have just run your code, and both programs print the same
>> values, so this is quite strange. You might have a broken or old
>> igraph installation. Please try to give me all information that I
>> might need to reproduce this:
>>
>> - igraph version
>> - operating system and compiler version
>> - how did you compile the programs (i.e. gcc options if you use gcc)
>> - send me the karate.txt file as an attachment
>>
>> Thanks,
>> G.
>>
>> ps. I will be offline for most of the following three days, and might
>> answer on Monday only, sorry about that.
>>
>> On Thu, May 21, 2009 at 11:39 PM, Enzo Tagliazucchi <address@hidden>
>> wrote:
>> > Gabor,
>> >
>> > I don't get the same values. When running the following code (which
>> > prints
>> > the modularity values obtained by the merges, without constructing the
>> > membership vector),
>> >
>> [...]
>> >
>> > All this implies to me that either:
>> > a)  something is going wrong with the algorithms or my code (unlikely to
>> > me)
>> > b)  I've problems interpretating the results of the algorithms  (this
>> > might
>> > be the case)
>> [...]
>>
>> --
>> Gabor Csardi <address@hidden>     UNIL DGM
>>
>>
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>
>
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>



-- 
Gabor Csardi <address@hidden>     UNIL DGM