opened 01:38AM - 05 Feb 16 UTC

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The built-in function [neighborhood.size(graph, order, nodes=V(graph), ,,,)](htt…p://www.inside-r.org/packages/cran/igraph/docs/neighborhood) is implemented for an integer order (0, 1, 2, 3).
It would be usefull to write a code for non-integer order, for example, r=1.5; 2.5, 3.5.
Here is an example for order =1, 1.5, and 2: http://scalar.usc.edu/works/querying-social-media-with-nodexl/media/TwoDegreesArticleNetworkonWikipedia.jpg
Here is a possible solution for the order = 1.5:
http://stackoverflow.com/questions/32470713/how-to-calculate-the-neighborhood-of-a-graph-with-order-1-5
Mailing list reference: http://lists.nongnu.org/archive/html/igraph-help/2016-02/msg00000.html