Mathc initiation/Fichiers h : c45a6

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	x_l2d_dy.h

/* ---------------------------------- */
/* save as x_l2d_dy.h                 */
/* ---------------------------------- */
double lint2d_dy(
double (*P_f)(double x, double y),

double (*P_g)(double t),
double (*P_h)(double t),

double   y0,
double   y1,
   int   ny 
)
{
double t;
   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.;}

  t  = (y0 + i*(y1-y0)/ny);
  
           /* f(g(t),h(t)) * h(t)' */
           
  M += m * (*P_f)((*P_g)(t),(*P_h)(t)) *
  
                  fx_x((*P_h),t,H) ;
 }

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