Hi Stephan, There was a bug in the subgraph implementation. The vertex_index property map for the subgraph was returning the global indices instead of the local indices, which caused havoc when it tried to use the global indices to lookup in a local property map. I've checked in the fix to subgraph.hpp into CVS. On Wed, 6 Aug 2003, Stephan [iso-8859-1] Höfer wrote: yg-boo> yg-boo> int main(void) yg-boo> { yg-boo> Graph g(7); Also note that the above should be "8" instead of "7". yg-boo> boost::property_map<Graph, boost::edge_weight_t>::type weightmap = yg-boo> boost::get(boost::edge_weight, g); yg-boo> Edge e; bool inserted; yg-boo> yg-boo> boost::tie(e, inserted) = boost::add_edge(0, 1, g); weightmap[e] = 1; yg-boo> boost::tie(e, inserted) = boost::add_edge(1, 2, g); weightmap[e] = 1; yg-boo> boost::tie(e, inserted) = boost::add_edge(2, 3, g); weightmap[e] = 1; yg-boo> boost::tie(e, inserted) = boost::add_edge(3, 4, g); weightmap[e] = 1; yg-boo> boost::tie(e, inserted) = boost::add_edge(4, 5, g); weightmap[e] = 1; yg-boo> boost::tie(e, inserted) = boost::add_edge(5, 2, g); weightmap[e] = 1; yg-boo> boost::tie(e, inserted) = boost::add_edge(5, 6, g); weightmap[e] = 1; yg-boo> boost::tie(e, inserted) = boost::add_edge(6, 1, g); weightmap[e] = 1; yg-boo> boost::tie(e, inserted) = boost::add_edge(6, 7, g); weightmap[e] = 1; yg-boo> boost::tie(e, inserted) = boost::add_edge(7, 0, g); weightmap[e] = 1; Best Regards, Jeremy ---------------------------------------------------------------------- Jeremy Siek http://php.indiana.edu/~jsiek/ Ph.D. Student, Indiana Univ. B'ton email: jsiek@osl.iu.edu C++ Booster (http://www.boost.org) office phone: (812) 855-3608 ----------------------------------------------------------------------