Python 2.6.5 (r265:79063, Apr 16 2010, 13:57:41) In [1]: import igraph In [2]: g = igraph.Graph([(0,1), (0,2), (2,3), (3,4), (4,2), (2,5), (5,0), (6,3), (5,6)]) In [3]: g.eigenvector_centrality() Segmentation fault (core dumped) I get a segmentation fault error whenever I attempt to calculate eigenvector centrality using igraph. I am using version 0.5.4. What OS are you using and how did you insta