On 09.07.2015 10:46, François Kawala wrote:
2015-07-08 16:32 GMT+02:00 François Kawala <francois.kawala@gmail.com <mailto:francois.kawala@gmail.com>>:
Hello,
Here is a code snippet where I try to use the shortest_path function with a precomputed predecessor_map.
targets = range(1,10)
source = 0
distances_in, pred_map = shortest_distance(graph, source=source, target=targets, weights=graph.ep[EDGE_LEN], pred_map=True)
inward_path = shortest_path(graph, source=source, target=targets[5], pred_map=pred_map)
To run that code ends in:
File "/usr/lib/python2.7/dist-packages/graph_tool/topology/__init__.py", line 1348, in shortest_path if pred_map[target] == int(target): # no path to target File "/usr/lib/python2.7/dist-packages/graph_tool/__init__.py", line 438, in __getitem__ return self.__map[self.__key_trans(k)] Boost.Python.ArgumentError: Python argument types in VertexPropertyMap<int64_t>.__getitem__(VertexPropertyMap<int64_t>, numpy.int64) did not match C++ signature: __getitem__(graph_tool::PythonPropertyMap<boost::checked_vector_property_map<long, boost::typed_identity_property_map<unsigned long> > > {lvalue}, graph_tool::PythonVertex)
How could i circumvent that issue ?
You have to pass vertex descriptors, not integers. For instance, just use graph.vertex(source) instead of source. Same thing for target. Best, Tiago -- Tiago de Paula Peixoto <tiago@skewed.de>