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>


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