Mathc initiation/Fichiers h : c60a5
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x_surfxy.h |
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/* ---------------------------------- */
/* 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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