Hi, I am very much a newbie at this and would greatly appreciate some help on how I could get the brandes_betweenness_centrality function to work for me. I have the following code that compiles without error, but seg faults when I run it: #include <map> #include <boost/graph/graph_traits.hpp> #include <boost/graph/adjacency_list.hpp> #include <boost/graph/graph_utility.hpp> #include <boost/graph/betweenness_centrality.hpp> #include <boost/graph/exterior_property.hpp> int main() { ... // I am reading a network from a file and storing it into lEdges and lNumVertices typedef adjacency_list<vecS, vecS, undirectedS > Graph; Graph g(lEdges.begin(), lEdges.end(), lNumVertices); typedef boost::exterior_vertex_property<Graph, float> BetweennessProperty; typedef BetweennessProperty::map_type BetweennessMap; BetweennessMap lMap; brandes_betweenness_centrality(g, lMap); } If I could get this to work, I then have aspirations that the helper function central_point_dominance(g, lMap) might give me the betweenness centralization measure that I'm after. Thanks in advance for your help! Matthew