From my previous experience with BGL, the subgraph function has similar

Hi, I use g++ (GCC) 3.2.2 20030222 (Red Hat Linux 3.2.2-5). What I did is as follows: ===================================================================== 1. Use "brandes_betweenness_centrality()" to calculate the vertex betweenness centrality for all the vertices in the graph. 2. Find the vertex with the highest betweenness value. 3. Delete the vertex from the graph. 4. Repeat step 1 until no vertex left in the graph. ===================================================================== The code is sketched as follows: ======================================================================== typedef property VertexName; typedef property VertexProperty; typedef property EdgeProperty; typedef adjacency_list Graph; Graph G; //load graph ... while(num_vertices(G)>0) { int V = num_vertices(G); vector<double> vertex_centrality(V); brandes_betweenness_centrality(G, make_iterator_property_map(vertex_centrality.begin(), get(vertex_index, G), double())); //print the vertex betweenness centrality for all the vertices ... //find the index of the vertex with the highest betweenness centrality ... clear_vertex(...); remove_vertex(...); } ======================================================================== The above code is run on a graph with 8 vertices and 9 edges. Below is the edge list representation of my graph: node0 node4 node0 node1 node0 node2 node0 node3 node1 node2 node2 node3 node4 node5 node4 node6 node4 node7 The problem is as follows: 1. Extremely slow. The first iteration is fast, but you have to wait for a long time before the results of the second iteration to print out. 2. After several iterations, the vertex name printed out is wrong. (In my graph, at the third iteration, the vertex name is printed out wrong) 3. When there are two vertices and no edges in the graph, the program stops printing out anything, basically freezes there. problem. When I create a subgraph from a graph, everything is inherited correctly, including vertex names, edges, etc. When I try to create a subgraph from the subgraph from the previous step, I get segmentation fault when trying to print out vertex names. I think there may be some bugs in the source files dealing with the graph structure modification. Best regards, Qiaofeng