Mathc initiation/Fichiers h : c63a8

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	x_pluzxy.h

/* --------------------------------- */
/* save as x_pluzxy.h                */
/* --------------------------------- */
double FLUX_z_dzdxdy(

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    x,
   
double    y
)
{
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_x_dzdxdy(

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 nx),

double (*Pz0)(double x, double y),
double (*Pz1)(double x, double y),
   int   nz,
   
double (*Px0)(double y),
double (*Px1)(double y),
   int   nx,
   
double    y
)
{
   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_z_dzdxdy(    (*P_f),
                             (*P_fxyz_n),
                             (*Pz0),(*Pz1),nz,
  (((*Px0)(y))+i*(((*Px1)(y))-((*Px0)(y)))/nx),
                              y);
 }

 return( ((((*Px1)(y)) -((*Px0)(y)))*M) / (3*nx) );
}
/* --------------------------------- */
double FLUX_dzdxdy(
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 nx),

double (*Pz0)(double x, double y),
double (*Pz1)(double x, double y),
   int   nz,
   
double (*Px0)(double y),
double (*Px1)(double y),
   int   nx,
   
double   y0,
double   y1,
   int   ny
)
{
   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_x_dzdxdy(     (*P_f),
                             (*P_fxyz_n),
                             (*Pz0),(*Pz1),nz,
                             (*Px0),(*Px1),nx,
                             (y0+i*(y1-y0)/ny));
 }

  return( ((y1 -y0)*M) / (3*ny) );
}
/* --------------------------------- */
/* --------------------------------- */