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Re: [igraph] igraph_barabasi_game doubt

From: Gábor Csárdi
Subject: Re: [igraph] igraph_barabasi_game doubt
Date: Fri, 13 Jun 2014 16:25:30 -0400

Hi, I am not sure what exactly you expect us to do?

The 3 exponent is only true in the infinite limit, and also, you need
to allow multiple and loop edges, AFAIK. If I remember well this was
proven by Fan Chung et al.


On Fri, Jun 13, 2014 at 4:12 PM, Guilherme Ferraz de Arruda
<address@hidden> wrote:
> Hi,
> I am using the igraph library in C to generate Barabasi-Albert (the original
> model) networks that behaves as P(k) ~ k^(gamma), however when I tried to
> measure the gamma parameter (using
> http://tuvalu.santafe.edu/~aaronc/powerlaws/) but the estimated values are
> around 2.3~2.4 when the expected values should be near 3.
> I am using the following code:
> igraph_barabasi_game ( &graph, N, 1, m, 0, 0, 1, IGRAPH_UNDIRECTED,
> for N =4000 and m=4.
> Thanks in advance.
> Guilherme.
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