47 lines
1.6 KiB
C++
47 lines
1.6 KiB
C++
// This file is part of libigl, a simple c++ geometry processing library.
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//
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// Copyright (C) 2013 Alec Jacobson <alecjacobson@gmail.com>
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//
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// This Source Code Form is subject to the terms of the Mozilla Public License
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// v. 2.0. If a copy of the MPL was not distributed with this file, You can
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// obtain one at http://mozilla.org/MPL/2.0/.
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#include "median.h"
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#include "matrix_to_list.h"
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#include <vector>
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#include <algorithm>
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template <typename DerivedV, typename mType>
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IGL_INLINE bool igl::median(
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const Eigen::MatrixBase<DerivedV> & V, mType & m)
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{
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using namespace std;
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if(V.size() == 0)
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{
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return false;
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}
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vector<typename DerivedV::Scalar> vV;
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matrix_to_list(V,vV);
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// http://stackoverflow.com/a/1719155/148668
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size_t n = vV.size()/2;
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nth_element(vV.begin(),vV.begin()+n,vV.end());
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if(vV.size()%2==0)
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{
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nth_element(vV.begin(),vV.begin()+n-1,vV.end());
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m = 0.5*(vV[n]+vV[n-1]);
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}else
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{
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m = vV[n];
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}
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return true;
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}
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#ifdef IGL_STATIC_LIBRARY
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// Explicit template instantiation
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// generated by autoexplicit.sh
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template bool igl::median<Eigen::Block<Eigen::Matrix<float, -1, -1, 0, -1, -1>, -1, 1, true>, float>(Eigen::MatrixBase<Eigen::Block<Eigen::Matrix<float, -1, -1, 0, -1, -1>, -1, 1, true> > const&, float&);
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// generated by autoexplicit.sh
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template bool igl::median<Eigen::Block<Eigen::Matrix<double, -1, -1, 0, -1, -1>, -1, 1, true>, double>(Eigen::MatrixBase<Eigen::Block<Eigen::Matrix<double, -1, -1, 0, -1, -1>, -1, 1, true> > const&, double&);
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template bool igl::median<Eigen::Matrix<double, -1, 1, 0, -1, 1>, double>(Eigen::MatrixBase<Eigen::Matrix<double, -1, 1, 0, -1, 1> > const&, double&);
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#endif
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