Mathc initiation/Fichiers h : c63a9

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	x_pluzyx.h

/* --------------------------------- */
/* save as x_pluzyx.h                */
/* --------------------------------- */
double FLUX_z_dzdydx(

double (*P_f)(double x, double y, double z),

double (*P_fxyz_n)( double (*P_f)(double x, double y, double z), 
                    double h, pt3d n),

double (*Pz0)(double x, double y),
double (*Pz1)(double x, double y),
   int   nz,
   
double    y,

double    x
)
{
pt3d n;

   int i = 0;
double m = 0.;
double M = 0.;

 for(i = 0; i <= nz; i++)
 {
       if(i ==0 || i== nz){m = 1.;}
  else if(fmod(i,2) ==  0){m = 2.;}
  else                    {m = 4.;}

          n.x = x;
          n.y = y;
          n.z = ((*Pz0)(x,y)) + i*(((*Pz1)(x,y))-((*Pz0)(x,y)))/nz;


  M += m * (*P_fxyz_n)((*P_f),H,n);
 }

  return( ((((*Pz1)(x,y)) -((*Pz0)(x,y)))*M) / (3*nz) );
}
/* --------------------------------- */
double FLUX_y_dzdydx(
double (*P_f)(double x, double y, double z),

double (*P_fxyz_n)( double (*P_f)(double x, double y, double z), 
                    double h, pt3d ny),

double (*Pz0)(double x, double y),
double (*Pz1)(double x, double y),
   int   nz,
   
double (*Py0)(double x),
double (*Py1)(double x),
   int   ny,
   
double    x
)
{
   int i = 0;
double m = 0.;
double M = 0.;

 for(i = 0; i <= ny; i++)
 {
       if(i ==0 || i== ny){m = 1.;}
  else if(fmod(i,2) ==  0){m = 2.;}
  else                    {m = 4.;}

  M += m * FLUX_z_dzdydx(     (*P_f),
                              (*P_fxyz_n),
                              (*Pz0),(*Pz1),nz,                              
   (((*Py0)(x))+i*(((*Py1)(x))-((*Py0)(x)))/ny),
                               x);
 }

 return( ((((*Py1)(x)) -((*Py0)(x)))*M) / (3*ny) );
}
/* --------------------------------- */
double FLUX_dzdydx(
double (*P_f)(double x, double y, double z),

double (*P_fxyz_n)( double (*P_f)(double x, double y, double z), 
                    double h, pt3d ny),

double (*Pz0)(double x, double y),
double (*Pz1)(double x, double y),
   int   nz,
   
double (*Py0)(double x),
double (*Py1)(double x),
   int   ny,
   
double   x0,
double   x1,
   int   nx
)
{
   int i = 0;
double m = 0.;
double M = 0.;

 for(i = 0; i <= nx; i++)
 {
       if(i ==0 || i== nx){m = 1.;}
  else if(fmod(i,2) ==  0){m = 2.;}
  else                    {m = 4.;}

  M += m * FLUX_y_dzdydx(     (*P_f),  
                              (*P_fxyz_n),                              
                              (*Pz0),(*Pz1),nz,
                              (*Py0),(*Py1),ny,                              
                              (x0+i*(x1-x0)/nx));
 }

  return( ((x1 -x0)*M) / (3*nx) );
}
/* --------------------------------- */
/* --------------------------------- */