Polish

Trajectories/trajectories.py

@@ -14,6 +14,7 @@ import json
 import sys
 import numpy as np
 
+if len(sys.argv) != 2: sys.exit("Required argument: input-graph")
 g = graph_tool.load_graph(sys.argv[1])
 traj_prop = g.new_vertex_property('int', val = - 1)
 all_cost_functions = g.get_edges([g.edge_properties.cost_function])