Package de.tilman_neumann.jml.transcendental

Class Exp

java.lang.Object

de.tilman_neumann.jml.transcendental.Exp

public class Exp
extends Object

Implementation of the exponential function for big decimals.

Author:

Tilman Neumann

Constructor Summary

Constructors

Constructor	Description
Exp()

Method Summary

Modifier and Type	Method	Description
static BigDecimal	exp(BigDecimal x, Precision outPrec)
static BigDecimal	exp(BigDecimal w, Scale outScale)	Compute exp(w) using a more powerful argument reduction.
static void	main(String[] argv)	Test.

Methods inherited from class java.lang.Object

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

Constructor Detail

Exp

public Exp()

Method Detail

exp

public static BigDecimal exp(BigDecimal x,
                             Precision outPrec)

exp

public static BigDecimal exp(BigDecimal w,
                             Scale outScale)

Compute exp(w) using a more powerful argument reduction. This function uses the transform exp(w)=exp(x)^(2^K) with x=w*2^(-K). This way, we can bring the argument to develop in a power series arbitrarily near to 0 with very high convergence speed.

Parameters:

w - argument

outScale - wanted precision in after-floating point decimal digits

Returns:

exp(w)

main

public static void main(String[] argv)

Test.

Parameters:

argv - ignored