graph_laplacian.cc 2.41 KB
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// graph-tool -- a general graph modification and manipulation thingy
//
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// Copyright (C) 2006-2020 Tiago de Paula Peixoto <tiago@skewed.de>
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//
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// This program is free software; you can redistribute it and/or modify it under
// the terms of the GNU Lesser General Public License as published by the Free
// Software Foundation; either version 3 of the License, or (at your option) any
// later version.
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//
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// This program is distributed in the hope that it will be useful, but WITHOUT
// ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
// FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License for more
// details.
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//
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// You should have received a copy of the GNU Lesser General Public License
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// along with this program. If not, see <http://www.gnu.org/licenses/>.

#include <boost/python.hpp>
#include "graph.hh"
#include "graph_filtering.hh"
#include "graph_util.hh"
#include "numpy_bind.hh"

#include "graph_selectors.hh"
#include "graph_properties.hh"

#include "graph_laplacian.hh"

using namespace std;
using namespace boost;
using namespace graph_tool;

void laplacian(GraphInterface& g, boost::any index, boost::any weight,
               string sdeg,
               python::object odata, python::object oi,
               python::object oj)
{
    if (!belongs<vertex_scalar_properties>()(index))
        throw ValueException("index vertex property must have a scalar value type");

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    typedef UnityPropertyMap<double, GraphInterface::edge_t> weight_map_t;
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    typedef mpl::push_back<edge_scalar_properties, weight_map_t>::type
        weight_props_t;

    if (!weight.empty() && !belongs<edge_scalar_properties>()(weight))
        throw ValueException("weight edge property must have a scalar value type");

    if(weight.empty())
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        weight = weight_map_t();
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    deg_t deg;
    if (sdeg == "in")
        deg = IN_DEG;
    if (sdeg == "out")
        deg = OUT_DEG;
    if (sdeg == "total")
        deg = TOTAL_DEG;

    multi_array_ref<double,1> data = get_array<double,1>(odata);
    multi_array_ref<int32_t,1> i = get_array<int32_t,1>(oi);
    multi_array_ref<int32_t,1> j = get_array<int32_t,1>(oj);
    run_action<>()
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        (g, std::bind(get_laplacian(),
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                      std::placeholders::_1,  std::placeholders::_2,  std::placeholders::_3,
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                      deg, std::ref(data), std::ref(i), std::ref(j)),
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         vertex_scalar_properties(),
         weight_props_t())(index, weight);

}