Method pow2

JSAT/src/jsat/math/FastMath.java:117–124

Computes 2 x exactly be exploiting the IEEE format @param x the integer power to raise 2 too @return 2 x

(int x)

     * @return 2<sup>x</sup>
     */
    public static double pow2(int x)
    {
        if(x > Double.MAX_EXPONENT)
            return Double.POSITIVE_INFINITY;
        if(x < Double.MIN_EXPONENT)
            return 0;
        return longBitsToDouble((x+1023L)<<52);
    }
    
    /**
     * Computes 2<sup>x</sup>.<br>