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// -------------------------------------------------------------------------
// Definition des fonctions mathematiques hyperboliques: acosh, asinh, atanh
// pour Windows/NT uniquement.
// -------------------------------------------------------------------------
#ifdef WNT
#include <math.h>
#include <Standard_math.hxx>
#ifndef _Standard_MacroHeaderFile
# include <Standard_Macro.hxx>
#endif // _Standard_MacroHeaderFile
Standard_EXPORT double __cdecl acosh( double X)
{
double res;
res = log(X + sqrt(X * X - 1));
return res;
};
Standard_EXPORT double __cdecl asinh( double X)
{
double res;
// Modified by Sergey KHROMOV - Mon Nov 11 16:27:11 2002 Begin
// Correction of the formula to avoid numerical problems.
// res = log(X + sqrt(X * X + 1));
if (X > 0.)
res = log(X + sqrt(X * X + 1));
else
res = -log(sqrt(X * X + 1) - X);
// Modified by Sergey KHROMOV - Mon Nov 11 16:27:13 2002 End
return res;
};
Standard_EXPORT double __cdecl atanh( double X)
{
double res;
res = log((1 + X) / (1 - X)) / 2;
return res;
};
#endif
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