domain_fourD_periodic_nucleus_change_basis_tensor.cpp

/*
    Copyright 2017 Philippe Grandclement
 
    This file is part of Kadath.
 
    Kadath is free software: you can redistribute it and/or modify
    it under the terms of the GNU General Public License as published by
    the Free Software Foundation, either version 3 of the License, or
    (at your option) any later version.
 
    Kadath is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU General Public License for more details.
 
    You should have received a copy of the GNU General Public License
    along with Kadath.  If not, see <http://www.gnu.org/licenses/>.
*/
 
#include "headcpp.hpp"
 
#include "utilities.hpp"
#include "fourD_periodic.hpp"
#include "scalar.hpp"
#include "tensor_impl.hpp"
#include "tensor.hpp"
namespace Kadath {
 
Tensor Domain_fourD_periodic_nucleus::change_basis_spher_to_cart (int dd, const Tensor& so) const {
  
  // Lust start from spherical tensorial basis
  if (so.get_basis().get_basis(dd) != SPHERICAL_BASIS) {
      cerr << "The input tensorial basis must be spherical in Domain_fourD_periodic_nucleus::change_basis_spher_to_cart" << endl ;
      abort() ;
  }
  
  // Need to remove the symetry :
  int val = so.get_valence() ;
  Array<int> type_ind (so.get_index_type()) ;
  Tensor res (so.get_space(), val, type_ind, so.get_basis()) ;
  
  if (so.is_name_affected()) {
      res.set_name_affected() ;
      for (int i=0 ; i<val ; i++)
      res.set_name_ind (i, so.get_name_ind()[i]) ;
  }
  for (int i=0 ; i<res.get_n_comp() ; i++)
    res.set(res.indices(i)).set_domain(dd) = so(res.indices(i))(dd) ;
  
  // Loop on the number of indices : 
  Dim_array dimother (so.get_valence()-1) ;
  for (int i=0 ; i<so.get_valence()-1 ; i++)
    dimother.set(i) = 4 ;
  
  for (int ind=0 ; ind<so.get_valence() ; ind++) {
    
   
   Index posother (dimother) ;
    do {
     
    
      Index posr (so) ;
      Index post (so) ;
      Index posp (so) ;
      int pos_inother= 0 ;
 
      for (int conte=0 ; conte<so.get_valence() ; conte++) {
    if (conte==ind) {
      posr.set(conte) = 0 ;
      post.set(conte) = 1 ;
      posp.set(conte) = 2 ;
    }
    else {
      posr.set(conte) = posother(pos_inother) ;
      post.set(conte) = posother(pos_inother) ;
      posp.set(conte) = posother(pos_inother) ;
      pos_inother ++ ;
    }
      }
       
     Val_domain tmp (res(posr)(dd).mult_sin_theta() + res(post)(dd).mult_cos_theta()) ;
     Val_domain vx (tmp.mult_cos_phi() - res(posp)(dd).mult_sin_phi()) ;
     Val_domain vy (tmp.mult_sin_phi() + res(posp)(dd).mult_cos_phi()) ;
     Val_domain vz (res(posr)(dd).mult_cos_theta() - res(post)(dd).mult_sin_theta()) ;
     res.set(posr).set_domain(dd) = vx ;
     res.set(post).set_domain(dd) = vy ;
     res.set(posp).set_domain(dd) = vz ;
    }
    while (posother.inc()) ;
  }
 
  res.set_basis(dd) = CARTESIAN_BASIS ;
  return res ;
}  
     
}