Ok. After generating a long graph, I use linspace function to generate positions for the main paths of the graph. So I fixed these positions using the pin property. But after calling the function sfdp_layout all positions are changed. Is this the expected behavior? I presented the results in the previous post. Here is my relevant code: pin = g.new_vertex_property("bool") pos = g.new_vertex_property("vector<double>") v_c = g.new_vertex_property("double") v_s = g.new_vertex_property("int") # I created a graph with 11000 nodes. # setting positions for the main path position = np.linspace(0.0, 12.0, main_path_size) for i,idx in enumerate(main_path_i): pin[g.vertex(idx)] = True pos[g.vertex(idx)] = (0, position[i]) v_c[g.vertex(idx)] = 50 # color v_s[g.vertex(idx)] = 10 # size # setting positions for the second main path position = np.linspace(0.0, 12.0, sec_path_size) for i,idx in enumerate(sec_path_i): pin[g.vertex(idx)] = True pos[g.vertex(idx)] = (position[i], 12.0) v_c[g.vertex(idx)] = 250 # color v_s[g.vertex(idx)] = 10 # size # setting positions for the thirmain path position = np.linspace(0.0, 12.0, thi_path_size) for i,idx in enumerate(thi_path_i): pin[g.vertex(idx)] = True pos[g.vertex(idx)] = (-position[i], 12.0) v_c[g.vertex(idx)] = 350 # color v_s[g.vertex(idx)] = 10 # size # calling the layout function pos = gt.sfdp_layout(g, pin=pin, pos=pos) gt.graph_draw(g, pos, output_size=(1000, 1000), vertex_fill_color=v_c, vertex_size=v_s, vcmap=mat.cm.jet, output='mxt.png', fmt='png') -- View this message in context: http://main-discussion-list-for-the-graph-tool-project.982480.n3.nabble.com/... Sent from the Main discussion list for the graph-tool project mailing list archive at Nabble.com.