PrecondSolv.cpp

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#include <PrecondSolv.h>
#include <Check_espace_virtuel.h>
 
Implemente_instanciable(PrecondSolv,"PrecondSolv",Precond_base);
// XD precondsolv precond_base precondsolv NO_BRACE not_set
// XD attr solveur solveur_sys_base solveur REQ Solver type.
 
//
// printOn et readOn
 
Sortie& PrecondSolv::printOn(Sortie& s ) const
{
  return s;
}
 
Entree& PrecondSolv::readOn(Entree& is )
{
  is >> solveur;
  solveur.nommer("PrecondSolv");
  // Pour eviter trop d'affichage (Convergence)
  if (!solveur->limpr())
    solveur->fixer_limpr(-1);
  return is;
}
 
void PrecondSolv::prepare_(const Matrice_Base& m, const DoubleVect& src)
{
  solveur->reinit();
  Precond_base::prepare_(m, src);
}
 
/*! @brief Calcule la solution du systeme lineaire: A * solution = b avec la methode de relaxation PrecondSolv.
 *
 */
int PrecondSolv::preconditionner_(const Matrice_Base& matrice,
                                  const DoubleVect& b,
                                  DoubleVect& solution)
{
  double norme=mp_norme_vect(b);
  if (norme > 0.)
    {
      DoubleVect b2(b);
      // Certains solveurs peuvent avoir besoin de l'espace virtuel,
      // on calcule tout le vecteur:
      assert_espace_virtuel_vect(b2);
      operator_multiply(b2, 1. / norme, VECT_ALL_ITEMS);
 
      solveur.resoudre_systeme(matrice, b2, solution);
 
      if (echange_ev_solution_)
        {
          // On veut renvoyer un vecteur avec espace virtuel a jour
          // Plutot que de refaire un echange on multiplie tous les elements
          // mais il faut que l'espace virtuel soit deja a jour avant:
          assert_espace_virtuel_vect(solution);
          operator_multiply(solution, norme, VECT_ALL_ITEMS);
        }
      else
        {
          operator_multiply(solution, norme);
        }
    }
  else
    {
      if (echange_ev_solution_)
        {
          operator_egal(solution, 0., VECT_ALL_ITEMS);
        }
      else
        {
          operator_egal(solution, 0.);
        }
    }
  return 1;
}