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8688ff8b3a
but non-identity matrix l1 0 0 0 .... 0 l2 0 0 .... 0 0 l3 0 ... . . . . . . . . . And apply the multishift CG to it. Sum the poles and residues. Insist that this be the same as the exactly taken square root where l1,l2,l3 >= 0.
57 lines
1.3 KiB
C++
57 lines
1.3 KiB
C++
#include <Grid.h>
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using namespace std;
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using namespace Grid;
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using namespace Grid::QCD;
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template<class d>
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struct scal {
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d internal;
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};
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Gamma::GammaMatrix Gmu [] = {
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Gamma::GammaX,
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Gamma::GammaY,
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Gamma::GammaZ,
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Gamma::GammaT
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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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std::vector<int> latt_size = GridDefaultLatt();
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std::vector<int> simd_layout = GridDefaultSimd(Nd,vComplexF::Nsimd());
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std::vector<int> mpi_layout = GridDefaultMpi();
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GridCartesian Grid(latt_size,simd_layout,mpi_layout);
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GridRedBlackCartesian RBGrid(latt_size,simd_layout,mpi_layout);
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std::vector<int> seeds({1,2,3,4});
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GridParallelRNG pRNG(&Grid); pRNG.SeedFixedIntegers(seeds);
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LatticeFermion src(&Grid); random(pRNG,src);
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RealD nrm = norm2(src);
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LatticeFermion result(&Grid); result=zero;
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LatticeGaugeField Umu(&Grid); random(pRNG,Umu);
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std::vector<LatticeColourMatrix> U(4,&Grid);
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double volume=1;
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for(int mu=0;mu<Nd;mu++){
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volume=volume*latt_size[mu];
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}
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for(int mu=0;mu<Nd;mu++){
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U[mu] = peekIndex<LorentzIndex>(Umu,mu);
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}
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RealD mass=0.5;
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WilsonFermion Dw(Umu,Grid,RBGrid,mass);
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MdagMLinearOperator<WilsonFermion,LatticeFermion> HermOp(Dw);
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ConjugateGradient<LatticeFermion> CG(1.0e-8,10000);
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CG(HermOp,src,result);
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Grid_finalize();
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}
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