Polish

Trajectories/trajectories.py

@@ -26,6 +26,7 @@ traj_prop = g.new_vertex_property('int', val = - 1)
 # the index in lists traj_segm and expanded_traj.
 
 all_cost = g.get_edges([g.edge_properties.cost_function])
+# numpy array with dtype float64
 
 # Array of indices that sort on cost:
 ind_cost = np.argsort(all_cost[:, 2])