Mathc initiation/a318

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	x_pluyxz.h

/* --------------------------------- */
/* save as x_pluxyz.h                */
/* --------------------------------- */
double FLUX_y_dxdydz(

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 (*Px0)(double y, double z),
double (*Px1)(double y, double z),
   int   nx,
   
double    y,
   
double    z
)
{
pt3d n;

   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.;}

          n.z = z;
          n.x = ((*Px0)(y,z)) + i*(((*Px1)(y,z))-((*Px0)(y,z)))/nx;
          n.y = y;

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

  }

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

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 (*Px0)(double y, double z),
double (*Px1)(double y, double z),
   int   nx,
   
double (*Py0)(double z),
double (*Py1)(double z),
   int   ny,
   
double    z
)
{
   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_y_dxdydz(    (*P_f),
                             (*P_fxyz_n),
                             (*Px0),(*Px1),nx,
                           (((*Py0)(z))+i*(((*Py1)(z))-((*Py0)(z)))/ny),
                               z);
 }

 return( ((((*Py1)(z)) -((*Py0)(z)))*M) / (3*ny) );
}
/* --------------------------------- */
double FLUX_dxdydz(

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 (*Px0)(double y, double z),
double (*Px1)(double y, double z),
   int   nx,
   
double (*Py0)(double z),
double (*Py1)(double z),
   int   ny,
   
double   z0,
double   z1,
   int   nz
)
{
   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.;}

  M += m * FLUX_z_dxdydz(    (*P_f),
                             (*P_fxyz_n),
                             (*Px0),(*Px1),nx,
                             (*Py0),(*Py1),ny,
                             (z0+i*(z1-z0)/nz));
 }

  return( ((z1 -z0)*M) / (3*nz) );
}
/* --------------------------------- */
/* --------------------------------- */