/// <summary>
/// If $y > 25$, this returns $b$. If $y < -25$ returns $a$.
/// {@inheritDoc}
/// </summary>
public virtual double inverseTransform(double y)
{
if (y > TANH_MAX)
{
return(_upper);
}
else if (y < -TANH_MAX)
{
return(_lower);
}
return(_mid + _scale * TrigonometricFunctionUtils.tanh(y));
}
/// <summary>
/// {@inheritDoc} </summary>
/// <exception cref="IllegalArgumentException"> If $x > b$ or $x < a$ </exception>
public virtual double transform(double x)
{
ArgChecker.isTrue(x <= _upper && x >= _lower, "parameter out of range");
if (x == _upper)
{
return(TANH_MAX);
}
else if (x == _lower)
{
return(-TANH_MAX);
}
return(TrigonometricFunctionUtils.atanh((x - _mid) / _scale));
}
