// This file is part of libigl, a simple c++ geometry processing library.
// 
// Copyright (C) 2013 Alec Jacobson <alecjacobson@gmail.com>
// 
// This Source Code Form is subject to the terms of the Mozilla Public License 
// v. 2.0. If a copy of the MPL was not distributed with this file, You can 
// obtain one at http://mozilla.org/MPL/2.0/.
#include "all_pairs_distances.h"
#include <Eigen/Dense>

template <typename Mat>
IGL_INLINE void igl::all_pairs_distances(
  const Mat & V,
  const Mat & U,
  const bool squared,
  Mat & D)
{
  // dimension should be the same
  assert(V.cols() == U.cols());
  // resize output
  D.resize(V.rows(),U.rows());
  for(int i = 0;i<V.rows();i++)
  {
    for(int j=0;j<U.rows();j++)
    {
      D(i,j) = (V.row(i)-U.row(j)).squaredNorm();
      if(!squared)
      {
        D(i,j) = sqrt(D(i,j));
      }
    }
  }
}

#ifdef IGL_STATIC_LIBRARY
// Explicit template instantiation
// generated by autoexplicit.sh
template void igl::all_pairs_distances<Eigen::Matrix<double, -1, -1, 0, -1, -1> >(Eigen::Matrix<double, -1, -1, 0, -1, -1> const&, Eigen::Matrix<double, -1, -1, 0, -1, -1> const&, bool, Eigen::Matrix<double, -1, -1, 0, -1, -1>&);
#endif