Mathc initiation/c36a3

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	x_xyz.h

/* --------------------------------- */
/* save as x_xyz.h                   */
/* --------------------------------- */
double intx_dxdydz(

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

double (*Px0)(double y, double z),
double (*Px1)(double y, double z),
   int   nx,
   
double    y,
   
double    z
)
{
   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 * (*P_f)( ((*Px0)(y,z)) + i*(((*Px1)(y,z))-((*Px0)(y,z)))/nx, y, z);
 }

  return( ((((*Px1)(y,z)) -((*Px0)(y,z)))*M) / (3*nx) );
}
/* --------------------------------- */
double inty_dxdydz(
double (*P_f)(double x, double y, double z),
   
double (*Px0)(double y, double z),
double (*Px1)(double y, double z),
   int   nx,

double (*Py0)(double x),
double (*Py1)(double x),
   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 * intx_dxdydz(  
       (*P_f),     
       (*Px0),(*Px1),nx,         
     (((*Py0)(z))+i*(((*Py1)(z))-((*Py0)(z)))/ny),         
          z);
 }

 return( ((((*Py1)(z)) -((*Py0)(z)))*M) / (3*ny) );
}
/* --------------------------------- */
double simpson_dxdydz(
double (*P_f)(double x, double y, double z),
   
double (*Px0)(double y, double z),
double (*Px1)(double y, double z),
   int   nx,
   
double (*Py0)(double x),
double (*Py1)(double x),
   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 * inty_dxdydz(
       (*P_f),         
       (*Px0),(*Px1),nx,       
       (*Py0),(*Py1),ny,          
       (z0+i*(z1-z0)/nz));
 }

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