| public static HighAccuracyFunction ( double x ) : double | ||
| x | double | |
| return | double | |
public static double HighAccuracyFunction(double x)
{
double sum = x;
double term = 0;
double nextTerm = x;
double pwr = x * x;
double i = 1;
// Iterate until adding next terms doesn't produce
// any change within the current numerical accuracy.
while (sum != term)
{
term = sum;
// Next term
nextTerm *= pwr / (i += 2);
sum += nextTerm;
}
return 0.5 + sum * Math.Exp(-0.5 * pwr - 0.5 * Constants.Log2PI);
}