Re: [igraph] Question about finding power in a scale-free graph

[Tamás Nepusz]

> I get an alpha = 2.8 , which is different from the power I used in building 
> the graph. Does anyone have any explanation for this?
The power argument does not specify the alpha exponent of the degree 
distribution; it specifies the exponent used when igraph determines the 
attachment probabilities after a new vertex is added. power=1 corresponds to 
linear preferential attachment, which should indeed correspond to alpha = 3 in 
the infinite limit, so the value of 2.8 you get seems to be correct.

-- 
Tamas