Re: [igraph] Choosing between different methods of detecting communities

[Roey Angel]

Thanks Gabor,
Using community() gave the right input for Tamas' function (haven't tried your solution, Tamas).

Thank you both for the help
Roey


On 10/09/2012 04:02 PM, Gábor Csárdi wrote:

On Tue, Oct 9, 2012 at 6:51 AM, Roey Angel <address@hidden> wrote:

Hi Tamas,
Thanks again. This is exactly my prob. I know about membership() but that
produces an an numeric not a list. Even coercing it with as.list() doesn't
do the trick and the function doesn't work.
The problem is to convert membership to a list of communities containing
each it's respective nodes, but I can't figure out how to do that. I'm just
not familiar enough with these objects to even understand where exactly the
node names are stored.

You don't need to be familiar with the internal representation(s) of
these object. In fact, quite the contrary, you should not use the
internals, because they might change. Just use the API. E.g. to get
the list you want, just use the communities() function. See more at
?communities. E.g.

g <- graph.ring(10)
fc <- fastgreedy.community(g)
membership(fc)
#  [1] 2 2 2 2 1 1 1 1 3 3
communities(fc)
# $`1`
# [1] 5 6 7 8
#
# $`2`
# [1] 1 2 3 4
#
# $`3`
# [1]  9 10

Gabor

[...]

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