Hi everyone, I've been working around with graph-tool and I have found a strange behaviour. A have this input .dot file graph G { 0 ; 10 ; 200 ; 1000 ; 0--200 ; 10--200 ; 1000--200 ; 1000--10 ; } I load the graph in graph_tool using g=load_graph("example.dot") and everything is OK. Now I want to know the output_degree of the node with identifier 200 (index 2). I use: g.vertex(2).out_degree() that returns 2 Obviously vertex with identifier 200 (index 2) must return 3. I have executed g.save("graphtool_dump.dot") with the following output: graph G { 0; 10; 1000; 200; 0--200 ; 10--200 ; 1000--200 ; 1000--10 ; } The nodes have been reordered (probably following alphabetic order) and now the vertex with identifier "200" is in position 3 instead of 2. This behaviour can be very annoying in some cases, and can lead to confusion. Does exist any way to avoid this reordering? Thanks in advance, Juan