Mathc initiation/Fichiers h : c45a5

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	x_l2d_dx.h

/* ---------------------------------- */
/* save as x_l2d_dx.h                 */
/* ---------------------------------- */
double lint2d_dx(
double (*P_f)(double x, double y),

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

double   x0,
double   x1,
   int   nx
)
{
double t;
   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.;}

  t  = (x0 + i*(x1-x0)/nx);
  
            /* f (g(t),h(t)) * g(t)' */
            
  M += m * (*P_f)((*P_g)(t),(*P_h)(t)) *
  
                  fx_x((*P_g),t,H) ;
 }

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