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/*
* Copyright (c) 1999-2001 Eric Gourgoulhon
*
* This file is part of LORENE.
*
* LORENE 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 2 of the License, or
* (at your option) any later version.
*
* LORENE 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 LORENE; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*
*/
char chebimp_ini_C[] = "$Header: /cvsroot/Lorene/C++/Source/Non_class_members/Coef/chebimp_ini.C,v 1.6 2014/10/13 08:53:11 j_novak Exp $" ;
/*
* Routine de calcul des points de collocations
*
* x_i = sin( pi/2 i/(n-1) ) 0 <= i <= n-1
*
* des echantillonnages de [0, 1] rarefies en 0.
* Ces valeurs sont notamment utilisees pour les transformations de Tchebyshev
* impaires.
*
*
* Entree:
* -------
* const int n : nombre de degres de liberte
*
* Sortie:
* -------
* double* chebimp_ini : pointeur sur la table des points de collocation
* L'espace memoire correspondant a ce pointeur
* est alloue par la routine.
*/
/*
* $Id: chebimp_ini.C,v 1.6 2014/10/13 08:53:11 j_novak Exp $
* $Log: chebimp_ini.C,v $
* Revision 1.6 2014/10/13 08:53:11 j_novak
* Lorene classes and functions now belong to the namespace Lorene.
*
* Revision 1.5 2014/10/06 15:16:01 j_novak
* Modified #include directives to use c++ syntax.
*
* Revision 1.4 2005/02/18 13:14:12 j_novak
* Changing of malloc/free to new/delete + suppression of some unused variables
* (trying to avoid compilation warnings).
*
* Revision 1.3 2003/01/31 10:31:23 e_gourgoulhon
* Suppressed the directive #include <malloc.h> for malloc is defined
* in <stdlib.h>
*
* Revision 1.2 2002/10/16 14:36:53 j_novak
* Reorganization of #include instructions of standard C++, in order to
* use experimental version 3 of gcc.
*
* Revision 1.1.1.1 2001/11/20 15:19:29 e_gourgoulhon
* LORENE
*
* Revision 2.1 1999/11/24 16:18:29 eric
* Modif affichage.
*
* Revision 2.0 1999/02/22 15:44:12 hyc
* *** empty log message ***
*
*
* $Header: /cvsroot/Lorene/C++/Source/Non_class_members/Coef/chebimp_ini.C,v 1.6 2014/10/13 08:53:11 j_novak Exp $
*
*/
// headers du C
#include <cassert>
#include <cmath>
#include <cstdlib>
#include "headcpp.h"
// Variable externe de loch
//int loch_chebimp_ini = 0 ;
namespace Lorene {
//*****************************************************************************
double* chebimp_ini(const int n )
{
// Variables locales statiques
// ---------------------------
#define NMAX 30 /* Nombre maximun de dimensions differentes */
static double* table_x[NMAX] ; /* Tableau des pointeurs sur les tableaux */
static int nwork = 0 ; /* Nombre de tableaux deja initialises */
static int tbn[NMAX] ; /* Tableau des points deja initialises */
int indice ;
// Mise en zone critique de toute la routine
// #pragma critical (loch_chebimp_ini)
{
// Ce nombre de points a-t-il deja ete utilise ?
indice = -1 ;
int i ;
for ( i=0 ; i < nwork ; i++ ) {
if ( tbn[i] == n ) indice = i ;
}
// Initialisation
if (indice == -1) { /* Il faut une nouvelle initialisation */
if ( nwork >= NMAX ) {
cout << "chebimp_ini: nwork > NMAX : "
<< nwork << " <-> " << NMAX << endl ;
abort () ;
}
indice = nwork ; nwork++ ; tbn[indice] = n ;
table_x[indice] = new double[n] ;
double xx = M_PI / double(2*(n-1));
for ( i = 0; i < n ; i++ ) {
table_x[indice][i] = sin( xx * i );
}
}
} // Fin de la zone critique
// Valeurs de retour
return table_x[indice] ;
}
}
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