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156 lines
4.0 KiB
C++
156 lines
4.0 KiB
C++
/*************************************************************************************
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Grid physics library, www.github.com/paboyle/Grid
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Source file: ./tests/Test_synthetic_lanczos.cc
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Copyright (C) 2015
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Author: Peter Boyle <paboyle@ph.ed.ac.uk>
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Author: paboyle <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 <fenv.h>
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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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static int
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FEenableexcept (unsigned int excepts)
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{
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#if 0
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static fenv_t fenv;
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unsigned int new_excepts = excepts & FE_ALL_EXCEPT,
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old_excepts; // previous masks
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if ( fegetenv (&fenv) ) return -1;
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old_excepts = fenv.__control & FE_ALL_EXCEPT;
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// unmask
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fenv.__control &= ~new_excepts;
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fenv.__mxcsr &= ~(new_excepts << 7);
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return ( fesetenv (&fenv) ? -1 : old_excepts );
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#else
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return 0;
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#endif
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}
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*/
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template<class Field> class DumbOperator : public LinearOperatorBase<Field> {
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public:
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LatticeComplex scale;
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DumbOperator(GridBase *grid) : scale(grid)
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{
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GridParallelRNG pRNG(grid);
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std::vector<int> seeds({5,6,7,8});
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pRNG.SeedFixedIntegers(seeds);
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random(pRNG,scale);
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scale = exp(-Grid::real(scale)*3.0);
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std::cout << " True matrix \n"<< scale <<std::endl;
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}
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// Support for coarsening to a multigrid
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void OpDirAll (const Field &in, std::vector<Field> &out){};
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void OpDiag (const Field &in, Field &out) {};
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void OpDir (const Field &in, Field &out,int dir,int disp){};
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void Op (const Field &in, Field &out){
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out = scale * in;
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}
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void AdjOp (const Field &in, Field &out){
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out = scale * in;
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}
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void HermOp(const Field &in, Field &out){
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double n1, n2;
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HermOpAndNorm(in,out,n1,n2);
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}
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void HermOpAndNorm(const Field &in, Field &out,double &n1,double &n2){
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ComplexD dot;
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out = scale * in;
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dot= innerProduct(in,out);
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n1=real(dot);
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dot = innerProduct(out,out);
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n2=real(dot);
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}
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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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GridParallelRNG RNG(grid);
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std::vector<int> seeds({1,2,3,4});
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RNG.SeedFixedIntegers(seeds);
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RealD alpha = 1.2;
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RealD beta = 0.1;
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int order = 11;
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Chebyshev<LatticeComplex> Cheby(alpha,beta,order);
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std::ofstream file("cheby.dat");
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Cheby.csv(file);
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DumbOperator<LatticeComplex> HermOp(grid);
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FunctionHermOp<LatticeComplex> OpCheby(Cheby,HermOp);
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PlainHermOp<LatticeComplex> Op(HermOp);
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const int Nk = 40;
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const int Nm = 80;
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const int Nit= 10000;
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int Nconv;
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RealD eresid = 1.0e-6;
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ImplicitlyRestartedLanczos<LatticeComplex> IRL(Op,Op,Nk,Nk,Nm,eresid,Nit);
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ImplicitlyRestartedLanczos<LatticeComplex> ChebyIRL(OpCheby,Op,Nk,Nk,Nm,eresid,Nit);
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LatticeComplex src(grid); gaussian(RNG,src);
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{
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std::vector<RealD> eval(Nm);
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std::vector<LatticeComplex> evec(Nm,grid);
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IRL.calc(eval,evec,src, Nconv);
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}
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{
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std::vector<RealD> eval(Nm);
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std::vector<LatticeComplex> evec(Nm,grid);
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ChebyIRL.calc(eval,evec,src, Nconv);
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}
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Grid_finalize();
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}
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