
From:  Filippo Santi 
Subject:  [igraph] knn computation 
Date:  Tue, 23 Jan 2018 19:29:46 +0100 
Dear all,
I am new to R and even more to igraph. I am working on foreign direct investment network, and I am currently trying to compute average nearest neighbour degree and average nearest neighbour strength, using the knn function. My code is as following:
fdi.graph.2003 < graph_from_data_frame(fdi.edge.2003, directed = T, vertices = fdi.attr.2003)
ANND < knn(fdi.graph.2003)
However, R returns the following error message
Error in knn(fdi.graph.2003) :
At structural_properties.c:5889 : Average nearest neighbor degree Works only with simple graphs, Invalid value
Do you have any explanation to try to solve this issue? I tried to compute it building the graph from a simple binary edgelist too (the above message comes from computations based on a weighted network with plenty of edge attributes, built from a data.frame) but it is not working either.
Thanks for any help,
Filippo
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