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[igraph] Problem with Graph.Adjacency

From: Jonathan Donges
Subject: [igraph] Problem with Graph.Adjacency
Date: Thu, 25 Feb 2010 00:35:19 +0100

Dear Tamas,

I once again encountered a problem with the Graph.Adjacency function of the igraph Python interface v0.6, using Mac OSX. I usually create and store the adjacency matrix in Numpy int8 format to save memory for large networks.


>>> a = numpy.array([[1,0,1],[0,1,0],[1,0,1]], dtype="int8")
>>> g = igraph.Graph.Adjacency(list(a))


__main__:1: Warning: non-numeric value in matrix ignored


>>> print g
Directed graph (|V| = 3, |E| = 0)

On my local MacBook, it works when a.dtype = "int32". However, on our 64bit Linux cluster, only a.dtype = "float64" works, wasting a lot of memory.

Do you have any idea, what could be the cause of this issue?

Thank you very much!

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