Method exp

src/com/winvector/opt/impl/HelperFns.java:122–125

from: http://martin.ankerl.com/2007/02/11/optimized-exponential-functions-for-java/ �A Fast, Compact Approximation of the Exponential Function� Nicol N. Schraudolph 1998 @param x

(final double val)

	 * @param x
	 */
	private static double exp(final double val) {
		final long tmp = (long) (1512775 * val + 1072632447);
		return Double.longBitsToDouble(tmp << 32);
	}
	
	private static final double estExp0 = HelperFns.exp(0.0);