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

**From**: |
Tamás Nepusz |

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

**Date**: |
Sun, 13 Feb 2011 13:21:12 +0100 |

>* 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