tensorProd.cpp

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#include "tensorProd.h"
#include <cassert>

void tensorProd_Field_F(Field_G& u, const Field_F& v1, const Field_F& v2)
{
  return tensorProd_Field_F(u, 0, v1, v2);
}


void tensorProd_Field_F(Field_G& u, const int ex, const Field_F& v1, const Field_F& v2)
{
  int Nvol = u.nvol();
  int Nc   = CommonParameters::Nc();
  int Nd   = CommonParameters::Nd();

  assert(u.nvol() == v1.nvol());
  assert(u.nvol() == v2.nvol());
  assert(ex < u.nex());
  assert(v1.nex() == 1);
  assert(v2.nex() == 1);

  Mat_SU_N ut(v1.nc());
  double   utr, uti;

  for (int site = 0; site < Nvol; ++site) {
    for (int c1 = 0; c1 < Nc; ++c1) {
      for (int c2 = 0; c2 < Nc; ++c2) {
        utr = 0.0;
        uti = 0.0;
        for (int s = 0; s < Nd; ++s) {
          utr += v1.cmp_r(c2, s, site) * v2.cmp_r(c1, s, site)
                 + v1.cmp_i(c2, s, site) * v2.cmp_i(c1, s, site);
          uti += v1.cmp_r(c2, s, site) * v2.cmp_i(c1, s, site)
                 - v1.cmp_i(c2, s, site) * v2.cmp_r(c1, s, site);
        }
        ut.set(c1, c2, utr, uti);
      }
    }
    u.set_mat(site, ex, ut);
  }
}