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135 lines
3.0 KiB
C++
135 lines
3.0 KiB
C++
/*************************************************************************************
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Grid physics library, www.github.com/paboyle/Grid
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Source file: ./tests/Test_cheby.cc
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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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#include <Grid/Grid.h>
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using namespace std;
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using namespace Grid;
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;
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RealD InverseApproximation(RealD x){
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return 1.0/x;
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}
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RealD SqrtApproximation(RealD x){
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return std::sqrt(x);
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}
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RealD Approximation32(RealD x){
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return std::pow(x,-1.0/32.0);
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}
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RealD Approximation2(RealD x){
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return std::pow(x,-1.0/2.0);
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}
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RealD StepFunction(RealD x){
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if ( x<10.0 ) return 1.0;
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else return 0.0;
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}
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int main (int argc, char ** argv)
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{
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Grid_init(&argc,&argv);
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GridCartesian *grid = SpaceTimeGrid::makeFourDimGrid(GridDefaultLatt(),
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GridDefaultSimd(Nd,vComplex::Nsimd()),
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GridDefaultMpi());
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double lo=0.1;
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double hi=64.0;
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Chebyshev<LatticeFermion> ChebyInv(lo,hi,2000,InverseApproximation);
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{
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std::ofstream of("chebyinv");
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ChebyInv.csv(of);
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}
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ChebyInv.JacksonSmooth();
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{
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std::ofstream of("chebyinvjack");
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ChebyInv.csv(of);
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}
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Chebyshev<LatticeFermion> ChebyStep(lo,hi,200,StepFunction);
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{
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std::ofstream of("chebystep");
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ChebyStep.csv(of);
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}
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ChebyStep.JacksonSmooth();
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{
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std::ofstream of("chebystepjack");
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ChebyStep.csv(of);
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}
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lo=-8;
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hi=8;
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Chebyshev<LatticeFermion> ChebyIndefInv(lo,hi,40,InverseApproximation);
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{
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std::ofstream of("chebyindefinv");
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ChebyIndefInv.csv(of);
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}
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lo=0;
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hi=64;
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Chebyshev<LatticeFermion> ChebyNE(lo,hi,40,InverseApproximation);
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{
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std::ofstream of("chebyNE");
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ChebyNE.csv(of);
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}
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lo=0.0;
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hi=4.0;
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Chebyshev<LatticeFermion> Cheby32(lo,hi,2000,Approximation32);
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{
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std::ofstream of("cheby32");
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Cheby32.csv(of);
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}
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Cheby32.JacksonSmooth();
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{
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std::ofstream of("cheby32jack");
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Cheby32.csv(of);
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}
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Chebyshev<LatticeFermion> ChebySqrt(lo,hi,2000,Approximation2);
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{
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std::ofstream of("chebysqrt");
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ChebySqrt.csv(of);
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}
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ChebySqrt.JacksonSmooth();
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{
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std::ofstream of("chebysqrtjack");
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ChebySqrt.csv(of);
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}
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Grid_finalize();
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}
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