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61 lines
2.2 KiB
C++
61 lines
2.2 KiB
C++
/*************************************************************************************
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Grid physics library, www.github.com/paboyle/Grid
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Source file: ./lib/algorithms/iterative/NormalEquations.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_NORMAL_EQUATIONS_H
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#define GRID_NORMAL_EQUATIONS_H
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namespace Grid {
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///////////////////////////////////////////////////////////////////////////////////////////////////////
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// Take a matrix and form an NE solver calling a Herm solver
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///////////////////////////////////////////////////////////////////////////////////////////////////////
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template<class Field> class NormalEquations : public OperatorFunction<Field>{
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private:
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SparseMatrixBase<Field> & _Matrix;
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OperatorFunction<Field> & _HermitianSolver;
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public:
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/////////////////////////////////////////////////////
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// Wrap the usual normal equations trick
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/////////////////////////////////////////////////////
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NormalEquations(SparseMatrixBase<Field> &Matrix, OperatorFunction<Field> &HermitianSolver)
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: _Matrix(Matrix), _HermitianSolver(HermitianSolver) {};
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void operator() (const Field &in, Field &out){
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Field src(in._grid);
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_Matrix.Mdag(in,src);
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_HermitianSolver(src,out); // Mdag M out = Mdag in
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}
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};
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}
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#endif
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