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/* Copyright (c) 1997-2018
Ewgenij Gawrilow, Michael Joswig (Technische Universitaet Berlin, Germany)
http://www.polymake.org
This program is free software; you can redistribute it and/or modify it
under the terms of the GNU General Public License as published by the
Free Software Foundation; either version 2, or (at your option) any
later version: http://www.gnu.org/licenses/gpl.txt.
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 General Public License for more details.
--------------------------------------------------------------------------------
*/
#ifndef POLYMAKE_TOPAZ_GRAPH_H
#define POLYMAKE_TOPAZ_GRAPH_H
#include "polymake/Graph.h"
#include "polymake/FacetList.h"
#include "polymake/topaz/complex_tools.h"
namespace polymake { namespace topaz {
// Computes the graph of a simplicial complex.
template <typename Complex>
Graph<> vertex_graph(const Complex& C)
{
const PowerSet<int> OSK=k_skeleton(C,1);
const Set<int> V = accumulate(OSK, operations::add());
Graph<> G(V.size());
for (auto c_it=entire(OSK); !c_it.at_end(); ++c_it)
if (c_it->size() == 2) // is edge
G.edge(c_it->front(), c_it->back());
return G;
}
// Computes the dual graph of a simplicial complex.
Graph<> dual_graph(const FacetList& C);
} }
#endif // POLYMAKE_TOPAZ_GRAPH_H
// Local Variables:
// mode:C++
// c-basic-offset:3
// indent-tabs-mode:nil
// End:
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