public void timesIP( double scalar ) {
		x *= scalar;
		y *= scalar;
		z *= scalar;
		w *= scalar;
	}
public void timesIP( double scalar ) {
		x *= scalar;
		y *= scalar;
		z *= scalar;
		w *= scalar;
	}
public void timesIP ( double scalar ) { x *= scalar ; y *= scalar ; z *= scalar ; w *= scalar ; }
In-place scalar multiplication
@param scalar value that it is multiplied by
In - place scalar multiplication