I just want to make sure that I am using the function properly.
I know that it only will be 3 in the limit of large N, however I expected a
higher value for gamma. Besides, I tried to generate a similar network using
the networkx python library and got a gamma approximately 2.8
Guilherme.
Em Sexta-feira, 13 de Junho de 2014 17:25, Gábor Csárdi
<[email protected]> escreveu:
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.
Gabor
On Fri, Jun 13, 2014 at 4:12 PM, Guilherme Ferraz de Arruda
<[email protected]> 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,
> IGRAPH_BARABASI_PSUMTREE,0 );
> for N =4000 and m=4.
>
> Thanks in advance.
>
> Guilherme.
>
>
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>
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