public static Atom scaleEquals(Atom a, double s) {
		double x = a.getX();
		double y = a.getY();
		double z = a.getZ();

		x *= s;
		y *= s;
		z *= s;

		//Atom b = new AtomImpl();
		a.setX(x);
		a.setY(y);
		a.setZ(z);

		return a;
	}
public static Atom scaleEquals ( Atom a , double s ) { double x = a . getX ( ) ; double y = a . getY ( ) ; double z = a . getZ ( ) ; x *= s ; y *= s ; z *= s ; a . setX ( x ) ; a . setY ( y ) ; a . setZ ( z ) ; return a ; }
Multiply elements of a by s (in place)

@param a
@param s
@return the modified a