LORENE
chebimp_ini.C
1 /*
2  * Copyright (c) 1999-2001 Eric Gourgoulhon
3  *
4  * This file is part of LORENE.
5  *
6  * LORENE is free software; you can redistribute it and/or modify
7  * it under the terms of the GNU General Public License as published by
8  * the Free Software Foundation; either version 2 of the License, or
9  * (at your option) any later version.
10  *
11  * LORENE is distributed in the hope that it will be useful,
12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14  * GNU General Public License for more details.
15  *
16  * You should have received a copy of the GNU General Public License
17  * along with LORENE; if not, write to the Free Software
18  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
19  *
20  */
21 
22 
23 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 $" ;
24 
25 
26 /*
27  * Routine de calcul des points de collocations
28  *
29  * x_i = sin( pi/2 i/(n-1) ) 0 <= i <= n-1
30  *
31  * des echantillonnages de [0, 1] rarefies en 0.
32  * Ces valeurs sont notamment utilisees pour les transformations de Tchebyshev
33  * impaires.
34  *
35  *
36  * Entree:
37  * -------
38  * const int n : nombre de degres de liberte
39  *
40  * Sortie:
41  * -------
42  * double* chebimp_ini : pointeur sur la table des points de collocation
43  * L'espace memoire correspondant a ce pointeur
44  * est alloue par la routine.
45  */
46 
47 /*
48  * $Id: chebimp_ini.C,v 1.6 2014/10/13 08:53:11 j_novak Exp $
49  * $Log: chebimp_ini.C,v $
50  * Revision 1.6 2014/10/13 08:53:11 j_novak
51  * Lorene classes and functions now belong to the namespace Lorene.
52  *
53  * Revision 1.5 2014/10/06 15:16:01 j_novak
54  * Modified #include directives to use c++ syntax.
55  *
56  * Revision 1.4 2005/02/18 13:14:12 j_novak
57  * Changing of malloc/free to new/delete + suppression of some unused variables
58  * (trying to avoid compilation warnings).
59  *
60  * Revision 1.3 2003/01/31 10:31:23 e_gourgoulhon
61  * Suppressed the directive #include <malloc.h> for malloc is defined
62  * in <stdlib.h>
63  *
64  * Revision 1.2 2002/10/16 14:36:53 j_novak
65  * Reorganization of #include instructions of standard C++, in order to
66  * use experimental version 3 of gcc.
67  *
68  * Revision 1.1.1.1 2001/11/20 15:19:29 e_gourgoulhon
69  * LORENE
70  *
71  * Revision 2.1 1999/11/24 16:18:29 eric
72  * Modif affichage.
73  *
74  * Revision 2.0 1999/02/22 15:44:12 hyc
75  * *** empty log message ***
76  *
77  *
78  * $Header: /cvsroot/Lorene/C++/Source/Non_class_members/Coef/chebimp_ini.C,v 1.6 2014/10/13 08:53:11 j_novak Exp $
79  *
80  */
81 
82 // headers du C
83 #include <cassert>
84 #include <cmath>
85 #include <cstdlib>
86 
87 #include "headcpp.h"
88 
89 // Variable externe de loch
90 //int loch_chebimp_ini = 0 ;
91 
92 namespace Lorene {
93 //*****************************************************************************
94 
95 double* chebimp_ini(const int n )
96 {
97 
98 // Variables locales statiques
99 // ---------------------------
100 #define NMAX 30 /* Nombre maximun de dimensions differentes */
101 static double* table_x[NMAX] ; /* Tableau des pointeurs sur les tableaux */
102 static int nwork = 0 ; /* Nombre de tableaux deja initialises */
103 static int tbn[NMAX] ; /* Tableau des points deja initialises */
104 int indice ;
105 
106  // Mise en zone critique de toute la routine
107 // #pragma critical (loch_chebimp_ini)
108  {
109  // Ce nombre de points a-t-il deja ete utilise ?
110  indice = -1 ;
111  int i ;
112  for ( i=0 ; i < nwork ; i++ ) {
113  if ( tbn[i] == n ) indice = i ;
114  }
115 
116  // Initialisation
117  if (indice == -1) { /* Il faut une nouvelle initialisation */
118  if ( nwork >= NMAX ) {
119  cout << "chebimp_ini: nwork > NMAX : "
120  << nwork << " <-> " << NMAX << endl ;
121  abort () ;
122  }
123  indice = nwork ; nwork++ ; tbn[indice] = n ;
124 
125  table_x[indice] = new double[n] ;
126 
127  double xx = M_PI / double(2*(n-1));
128  for ( i = 0; i < n ; i++ ) {
129  table_x[indice][i] = sin( xx * i );
130  }
131  }
132 
133  } // Fin de la zone critique
134 
135  // Valeurs de retour
136  return table_x[indice] ;
137 
138 }
139 }
Cmp sin(const Cmp &)
Sine.
Definition: cmp_math.C:69
Lorene prototypes.
Definition: app_hor.h:64