Mathc initiation/0051

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	x_stokyx.h

/* ---------------------------------- */
/* save as x_stokyx.h                 */
/* ---------------------------------- */
/* ---------------------------------- */
double  stokes_dy(
double (*P_M)(double x, double y, double z),
double (*P_N)(double x, double y, double z),
double (*P_P)(double x, double y, double z),

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

double (*Py0)(double x),
double (*Py1)(double x),
   int   ny,
   
double    x
)
{
pt2d p;

   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.;}

 p.y =   ((*Py0)(x))+ 
      i*(((*Py1)(x))-((*Py0)(x)))
                    /ny;
 p.x = x;

 M += m * curlF_u(
              (*P_M),(*P_N),(*P_P),
              (*P_f),
                p);
 }

return(((((*Py1)(x))-((*Py0)(x)))*M)
                    / (3*ny) );
}
/* ---------------------------------- */
double stokes_dydx(

double (*P_M)(double x, double y, double z),
double (*P_N)(double x, double y, double z),
double (*P_P)(double x, double y, double z),

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

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 * stokes_dy((*P_M),(*P_N),(*P_P),
                    (*P_f),
                    (*Py0),(*Py1),ny,
                    (x0 + i*(x1-x0)/nx));
 }

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