Ln

java.lang.Object

de.tilman_neumann.jml.transcendental.Ln

public class Ln
extends java.lang.Object

Implementation of the natural logarithm function for BigDecimals.

Constructor Summary

Constructors

Constructor Description

Ln()

Method Summary

Modifier and Type	Method	Description
`static java.math.BigDecimal`	`ln(java.math.BigDecimal x, Precision outPrec)`
`static java.math.BigDecimal`	`ln(java.math.BigDecimal x, Scale outScale)`	Compute the natural logarithm of x, for x>0.
`static java.math.BigDecimal`	`ln2(Scale outScale)`	Faster ln2 implementation, computing the series expansion of 2^(1/k) for some optimally chosen k.
`static void`	`main(java.lang.String[] argv)`	Test.

Methods inherited from class java.lang.Object

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

Constructor Details
- Ln
  
  public Ln()
Method Details
- ln2
  
  public static java.math.BigDecimal ln2(Scale outScale)
  
  Faster ln2 implementation, computing the series expansion of 2^(1/k) for some optimally chosen k.
  
  Parameters:
  
  outScale - Wanted precision in after-comma decimal digits
  
  Returns:
  
  ln(2)
- ln
  
  public static java.math.BigDecimal ln(java.math.BigDecimal x, Precision outPrec)
- ln
  
  public static java.math.BigDecimal ln(java.math.BigDecimal x, Scale outScale)
  
  Compute the natural logarithm of x, for x>0. This algorithm takes the reciprocal of x>1 and then uses the simple reduction, followed by an AGM reduction. The fastest algorithm for all number ranges.
  
  Parameters:
  
  x -
  
  outScale -
  
  Returns:
  
  ln(x)
- main
  
  public static void main(java.lang.String[] argv)
  
  Test.
  
  Parameters:
  
  argv - ignored