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80 lines
2.4 KiB
C++
80 lines
2.4 KiB
C++
/*************************************************************************************
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Grid physics library, www.github.com/paboyle/Grid
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Source file: ./lib/algorithms/iterative/EigenSort.h
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Copyright (C) 2015
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Author: Peter Boyle <paboyle@ph.ed.ac.uk>
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License along
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with this program; if not, write to the Free Software Foundation, Inc.,
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51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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See the full license in the file "LICENSE" in the top level distribution directory
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*************************************************************************************/
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/* END LEGAL */
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#ifndef GRID_EIGENSORT_H
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#define GRID_EIGENSORT_H
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namespace Grid {
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/////////////////////////////////////////////////////////////
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// Eigen sorter to begin with
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/////////////////////////////////////////////////////////////
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template<class Field>
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class SortEigen {
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private:
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static bool less_lmd(RealD left,RealD right){
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return fabs(left) < fabs(right);
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}
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static bool less_pair(std::pair<RealD,Field>& left,
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std::pair<RealD,Field>& right){
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return fabs(left.first) < fabs(right.first);
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}
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public:
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void push(DenseVector<RealD>& lmd,
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DenseVector<Field>& evec,int N) {
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DenseVector<std::pair<RealD, Field> > emod;
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typename DenseVector<std::pair<RealD, Field> >::iterator it;
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for(int i=0;i<lmd.size();++i){
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emod.push_back(std::pair<RealD,Field>(lmd[i],evec[i]));
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}
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partial_sort(emod.begin(),emod.begin()+N,emod.end(),less_pair);
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it=emod.begin();
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for(int i=0;i<N;++i){
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lmd[i]=it->first;
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evec[i]=it->second;
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++it;
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}
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}
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void push(DenseVector<RealD>& lmd,int N) {
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std::partial_sort(lmd.begin(),lmd.begin()+N,lmd.end(),less_lmd);
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}
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bool saturated(RealD lmd, RealD thrs) {
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return fabs(lmd) > fabs(thrs);
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}
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};
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}
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#endif
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