Mathc initiation/Fichiers h : c60a7
Installer ce fichier dans votre répertoire de travail.
x_surfyx.h |
---|
/* ---------------------------------- */
/* save as x_surfyx.h */
/* ---------------------------------- */
double Sint_dyx(
double (*P_g)(double x, double y, double z),
double (*P_f)(double x, double y),
double (*P_u)(double x),
double (*P_v)(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 = ((*P_u)(x)) + i*(((*P_v)(x))-((*P_u)(x)))/ny;
p.x = x;
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)(x)) -((*P_u)(x)))*M) / (3*ny) );
}
/* ---------------------------------- */
double surface_dydx(
double (*P_g)(double x, double y, double z),
double (*P_f)(double x, double y),
double (*P_u)(double x),
double (*P_v)(double x),
int nx,
double ax,
double bx,
int ny
)
{
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 * Sint_dyx( (*P_g),(*P_f),
(*P_u),(*P_v), ny,
(ax + i*(bx-ax)/nx));
}
return( ((bx -ax)*M) / (3*nx) );
}
/* ---------------------------------- */
/* ---------------------------------- */
Déclaration des fichiers h.