Herezh_dev/Resolin/preconditionnement/diagpre_double_GR.cc

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/*+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++*/
/* ******** *** SparseLib++ */
/* ******* ** *** *** *** v. 1.5c */
/* ***** *** ******** ******** */
/* ***** *** ******** ******** R. Pozo */
/* ** ******* *** ** *** *** K. Remington */
/* ******** ******** A. Lumsdaine */
/*+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++*/
/* */
/* */
/* SparseLib++ : Sparse Matrix Library */
/* */
/* National Institute of Standards and Technology */
/* University of Notre Dame */
/* Authors: R. Pozo, K. Remington, A. Lumsdaine */
/* */
/* NOTICE */
/* */
/* Permission to use, copy, modify, and distribute this software and */
/* its documentation for any purpose and without fee is hereby granted */
/* provided that the above notice appear in all copies and supporting */
/* documentation. */
/* */
/* Neither the Institutions (National Institute of Standards and Technology, */
/* University of Notre Dame) nor the Authors make any representations about */
/* the suitability of this software for any purpose. This software is */
/* provided ``as is'' without expressed or implied warranty. */
/* */
/*+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++*/
#include <stdlib.h>
#include "diagpre_double_GR.h" // modif GR : découle d'une classe virtuelle
// pour avoir une interface standard
#include "Mat_pleine.h"
#include "MatBand.h"
#include "Mat_creuse_CompCol.h"
#include "ConstMath.h"
#include "MathUtil.h"
DiagPreconditioner_double::DiagPreconditioner_double(const CompRow_Mat_double &C)
: diag_(C.dim(0))
{
int i;
if ((i = CopyInvDiagonals(C.dim(0), &C.row_ptr(0), &C.col_ind(0),
&C.val(0), &diag(0))) != 0) {
cerr << "Diagonal preconditioner failure.";
cerr << " Zero detected in element " << i << endl;
Sortie(1);
}
}
DiagPreconditioner_double::DiagPreconditioner_double(const CompCol_Mat_double &C)
: diag_ (C.dim (0))
{
int i;
if ((i = CopyInvDiagonals(C.dim(0), &C.col_ptr(0), &C.row_ind(0),
&C.val(0), &diag(0))) != 0) {
cerr << "Diagonal preconditioner failure.";
cerr << " Zero detected in element " << i << endl;
Sortie(1);
}
}
// cas d'une matrice abstraite
DiagPreconditioner_double::DiagPreconditioner_double(const Mat_abstraite &A) :
diag_ (A.Nb_ligne())
{ int i;
switch (A.Type_matrice())
{ case CREUSE_COMPRESSEE_LIGNE :
{const CompRow_Mat_double &C = (CompRow_Mat_double &) A;
// ici il y aura une modif a faire comme pour les matrices compressées colonne
// il faut passer la matrice dérivée et non la matrice mère
cout << "\n problème dans DiagPreconditioner_double(.. "
<< "voir le source .cpp, il y a du travail a faire";
Sortie(1);
if ((i = CopyInvDiagonals(C.dim(0), &C.row_ptr(0), &C.col_ind(0),
&C.val(0), &diag(0))) != 0)
{ cerr << "Diagonal preconditioner failure.";
cerr << " Zero detected in element " << i << endl;
Sortie(1);
}
break;
}
case CREUSE_COMPRESSEE_COLONNE :
{const Mat_creuse_CompCol &C = (Mat_creuse_CompCol &) A;
if ((i = CopyInvDiagonals(C.dim(0), &C.col_ptr(0), &C.row_ind(0),
&C.val(0), &diag(0))) != 0)
{ cerr << "Diagonal preconditioner failure.";
cerr << " Zero detected in element " << i << endl;
Sortie(1);
}
break;
}
default :
{if ((i = CopyInvDiagonals(A)) != 0)
{ cerr << "Diagonal preconditioner failure.";
cerr << " Zero detected in element " << i << endl;
Sortie(1);
}
}
};
};
int
DiagPreconditioner_double::CopyInvDiagonals
(int n, const int *pntr, const int *indx
,const double *sa, double *diag)
{
int i, j;
for (i = 0; i < n; i++)
diag[i] = 0;
/* Find the diagonal elements */
for (i = 0; i < n; i++) {
for (j = pntr[i]; j < pntr[i+1]; j++) {
if (indx[j] == i) {
if (sa[j] == 0)
return i;
diag[i] = 1. / sa[j];
break;
}
}
if (diag[i] == 0)
return -i;
}
return 0;
}
// surcharge de la fonction pour les matrices carrées et/ou bande
int DiagPreconditioner_double::CopyInvDiagonals(const Mat_abstraite& A)
{ switch (A.Type_matrice())
{ case CARREE :
break;
case CARREE_LAPACK :
break;
case BANDE_SYMETRIQUE :
case CARREE_SYMETRIQUE : break;
case RECTANGLE : break;
case BANDE_NON_SYMETRIQUE: break;
case CARREE_SYMETRIQUE_LAPACK : break;
case RECTANGLE_LAPACK : break;
case BANDE_SYMETRIQUE_LAPACK : break;
case BANDE_NON_SYMETRIQUE_LAPACK : break;
case CREUSE_NON_COMPRESSEE : break;
case CREUSE_COMPRESSEE_COLONNE : break;
case CREUSE_COMPRESSEE_LIGNE : break;
case DIAGONALE : break;
default :
cout << "\nErreur : valeur incorrecte du type de matrice !"
<< " = " << A.Type_matrice() << " , ce tye n'est pas encore "
<< " pris en compte dans le préconditionnement diagonal\n";
cout << "\n CopyInvDiagonals(Mat_abstraite& A, double *diag)\n";
Sortie(1);
};
int n = A.Nb_ligne();
for (int i = 1; i <= n; i++)
if (Abs(A(i,i)) < ConstMath::trespetit)
return -1;
else
diag(i-1) = 1./A(i,i);
return 0;
};
VECTOR_double
DiagPreconditioner_double::solve (const VECTOR_double &x) const
{
VECTOR_double y(x.size());
for (int i = 0; i < x.size(); i++)
y(i) = x(i) * diag(i);
return y;
}
VECTOR_double
DiagPreconditioner_double::trans_solve (const VECTOR_double &x) const
{
VECTOR_double y(x.size());
for (int i = 0; i < x.size(); i++)
y(i) = x(i) * diag(i);
return y;
}