[igraph] Alpha Centrality Function Crashes

[Judd Antin]

Hi all,

I've been using igraph in R to look at a a very large, sparse directed 
network of about 58,000 nodes and 87,000 edges. I am interested in 
calculating alpha centrality scores, but the alpha.centrality function 
crashes R for me instantaneously. I've tried this on both Windows and 
Mac builds of the library (in case of a platform dependent issue), with 
the same results.

Does anyone have any insight on how I could get this to work? Is the 
size of the network simply too large? I also noticed in the manual that 
'singular adjacency matrices' can cause problems for the algorithm, but 
I'm not sure what a 'singular adjacency matrix' is.

Any advice appreciated.

Thanks!

--Judd

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Judd Antin
School of Information
University of California Berkeley
address@hidden
web: http://technotaste.com
blog: http://technotaste.com/blog