Mathc initiation/Fichiers h : c60a5

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	x_surfxy.h

/* ---------------------------------- */
/* save as x_surfxy.h                 */
/* ---------------------------------- */
double   Sint_dxy(
double (*P_g)(double x, double y, double z),

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

double (*P_u)(double y),
double (*P_v)(double y),
   int nx,
   
double  y
)
{
pt2d p;
   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.;}

        p.x = ((*P_u)(y)) + i*(((*P_v)(y))-((*P_u)(y)))/nx;
        p.y = y;

  M += m * (       (*P_g)(p.x,p.y,(*P_f)(p.x,p.y)) *
                    sqrt( pow(fxy_x((*P_f),H,p),2) +
                          pow(fxy_y((*P_f),H,p),2) +
                          1));
 }

  return( ((((*P_v)(y)) -((*P_u)(y)))*M) / (3*nx) );
}
/* ---------------------------------- */
double surface_dxdy(
double (*P_g)(double x, double y, double z),
double (*P_f)(double x, double y),

double (*P_u)(double y),
double (*P_v)(double y),
   int nx,
   
double ay,
double by,
   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 * Sint_dxy( (*P_g),(*P_f),
                     (*P_u),(*P_v), nx,                                   
                     (ay + i*(by-ay)/ny));
 }

  return( ((by -ay)*M) / (3*ny) );
}
/* ---------------------------------- */
/* ---------------------------------- */

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