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68 lines
2.2 KiB
C++
68 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/approx/MultiShiftFunction.h
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Copyright (C) 2015
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Author: Azusa Yamaguchi <ayamaguc@staffmail.ed.ac.uk>
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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 MULTI_SHIFT_FUNCTION
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#define MULTI_SHIFT_FUNCTION
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namespace Grid {
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class MultiShiftFunction {
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public:
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int order;
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std::vector<RealD> poles;
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std::vector<RealD> residues;
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std::vector<RealD> tolerances;
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RealD norm;
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RealD lo,hi;
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MultiShiftFunction(int n,RealD _lo,RealD _hi): poles(n), residues(n), lo(_lo), hi(_hi) {;};
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RealD approx(RealD x);
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void csv(std::ostream &out);
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void gnuplot(std::ostream &out);
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void Init(AlgRemez & remez,double tol,bool inverse)
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{
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order=remez.getDegree();
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tolerances.resize(remez.getDegree(),tol);
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poles.resize(remez.getDegree());
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residues.resize(remez.getDegree());
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remez.getBounds(lo,hi);
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if ( inverse ) remez.getIPFE (&residues[0],&poles[0],&norm);
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else remez.getPFE (&residues[0],&poles[0],&norm);
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}
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// Allow deferred initialisation
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MultiShiftFunction(void){};
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MultiShiftFunction(AlgRemez & remez,double tol,bool inverse)
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{
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Init(remez,tol,inverse);
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}
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};
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}
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#endif
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