Class BoostMath

java.lang.Object

org.apache.commons.numbers.gamma.BoostMath

final class BoostMath
extends Object

Math functions used by the Boost functions.

This code has been adapted from the Boost c++ implementations in <boost/math/special_functions/>. All work is copyright John Maddock 2006 and subject to the Boost Software License.

Constructor Summary

Constructors

Modifier	Constructor	Description
private	BoostMath()	Private constructor.

Method Summary

Modifier and Type	Method	Description
(package private) static double	powm1(double x, double y)	Returns pow(x, y) - 1.

Methods inherited from class Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Details

BoostMath

private BoostMath()

Private constructor.

Method Details

powm1

static double powm1(double x,
 double y)

Returns pow(x, y) - 1. This function is accurate when x -> 1 or y is small.

Adapted from boost/math/special_functions/powm1.hpp. Explicit handling of edges cases (overflow, domain error) using the policy has been removed.

Parameters:

x - the x

y - the y

Returns:

pow(x, y) - 1