fatanh static method

double fatanh(double x)

Implementation

static double fatanh( double x ){
	if( ClipMath.abs( x ) > _eps5 ){
		return ClipMath.log( (1.0 + x) / (1.0 - x) ) * 0.5;
	}
	return x * (1.0 + x * x / 3.0);
}