Mathc initiation/c36a5

Installer ce fichier dans votre répertoire de travail.

	x_yxz.h

/* ---------------------------------- */
/* save as x_yxz.h                   */
/* --------------------------------- */
double inty_dydxdz(
double (*P_f)(double x, double y, double z),

double (*Py0)(double x, double z),
double (*Py1)(double x, double z),
   int   ny,

double    x,

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 * (*P_f)( x, ((*Py0)(x,z)) + i*(((*Py1)(x,z))-((*Py0)(x,z)))/ny, z);
 }

  return( ((((*Py1)(x,z)) -((*Py0)(x,z)))*M) / (3*ny) );
}
/* --------------------------------- */
double intx_dydxdz(
double (*P_f)(double x, double y, double z),
   
double (*Py0)(double x, double z),
double (*Py1)(double x, double z),
   int    ny,

double (*Px0)(double z),
double (*Px1)(double z),
   int    nx,

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

 return( ((((*Px1)(z)) -((*Px0)(z)))*M) / (3*nx) );
}
/* --------------------------------- */
double simpson_dydxdz(
double (*P_f)(double x, double y, double z),
   
double (*Py0)(double x, double z),
double (*Py1)(double x, double z),
   int    ny,
   
double (*Px0)(double x),
double (*Px1)(double x),
   int   nx,

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 * intx_dydxdz(
       (*P_f),         
       (*Py0),(*Py1),ny,       
       (*Px0),(*Px1),nx, 
       (z0+i*(z1-z0)/nz));
 }

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