I'm seeing a weird problem in fruchterman_reingold.hpp that after the displacements are calculated for every vertex, it gets down to the loop where it updates the positions (starting on line 327), and all the displacements are (0,0) by that point (they had been sensible values up in the calculation loop). Any idea what I could be doing to cause that? Here is my code: struct spring_attractive_force { template<typename Graph, typename T> T operator()(typename graph_traits<Graph>::edge_descriptor, T k, T d, const Graph&) const { return d; } }; struct magnetic_repulsive_force { template<typename Graph, typename T> T operator()(typename graph_traits<Graph>::vertex_descriptor, typename graph_traits<Graph>::vertex_descriptor, T k, T d, const Graph&) const { return 1 / (d * d); } }; typedef adjacency_list<listS, listS, undirectedS, // Vertex properties property<vertex_index_t, int, property<vertex_position_t, point> >, // Edge properties property<edge_weight_t, double> > Graph; enum {A, B, C, D, E, F, G, H}; simple_edge triangular_edges[14] = { {A, B}, {B, C}, {C, A}, {D, E}, {E, F}, {F, G}, {G, H}, {H, D}, {D, F}, {F, H}, {H, E}, {E, G}, {G, D} }; Graph g(&triangular_edges[0], &triangular_edges[13], 8); // Generate (x,y) coordinates for every node // - Randomly layout vertices of graph minstd_rand gen; rectangle_topology<> rect_top(gen, -25, -25, 25, 25); random_graph_layout(g, get(vertex_position, g), rect_top); // - Run Fruchterman Reingold algorithm on them typedef square_topology<> Topology; Topology topology(gen, 50.0); fruchterman_reingold_force_directed_layout(g, get(vertex_position, g), topology, attractive_force(spring_attractive_force()). repulsive_force(magnetic_repulsive_force()). force_pairs(all_force_pairs()). cooling(linear_cooling<double>(100))); -- View this message in context: http://boost.2283326.n4.nabble.com/Trouble-w-fruchterman-reingold-tp4636494.... Sent from the Boost - Users mailing list archive at Nabble.com.