cern.jet.random
Class Logarithmic

java.lang.Object
  extended by cern.colt.PersistentObject
      extended by cern.jet.random.AbstractDistribution
          extended by cern.jet.random.AbstractContinousDistribution
              extended by cern.jet.random.Logarithmic
All Implemented Interfaces:
DoubleFunction, IntFunction, java.io.Serializable, java.lang.Cloneable

public class Logarithmic
extends AbstractContinousDistribution

Logarithmic distribution.

Valid parameter ranges: 0 < p < 1.

Instance methods operate on a user supplied uniform random number generator; they are unsynchronized.

Static methods operate on a default uniform random number generator; they are synchronized.

Implementation:

Method: Inversion/Transformation.
This is a port of lsk.c from the C-RAND / WIN-RAND library. C-RAND's implementation, in turn, is based upon

A.W. Kemp (1981): Efficient generation of logarithmically distributed pseudo-random variables, Appl. Statist. 30, 249-253.

Author:
wolfgang.hoschek@cern.ch
See Also:
Serialized Form

Field Summary
protected  double my_p
           
protected static Logarithmic shared
           
 
Fields inherited from class cern.jet.random.AbstractDistribution
randomGenerator
 
Fields inherited from class cern.colt.PersistentObject
serialVersionUID
 
Constructor Summary
Logarithmic(double p, RandomEngine randomGenerator)
          Constructs a Logarithmic distribution.
 
Method Summary
 double nextDouble()
          Returns a random number from the distribution.
 double nextDouble(double a)
          Returns a random number from the distribution; bypasses the internal state.
 void setState(double p)
          Sets the distribution parameter.
static double staticNextDouble(double p)
          Returns a random number from the distribution.
 java.lang.String toString()
          Returns a String representation of the receiver.
 
Methods inherited from class cern.jet.random.AbstractDistribution
apply, apply, clone, getRandomGenerator, makeDefaultGenerator, nextInt, setRandomGenerator
 
Methods inherited from class java.lang.Object
equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait
 

Field Detail

my_p

protected double my_p

shared

protected static Logarithmic shared
Constructor Detail

Logarithmic

public Logarithmic(double p,
                   RandomEngine randomGenerator)
Constructs a Logarithmic distribution.

Method Detail

nextDouble

public double nextDouble()
Returns a random number from the distribution.

Specified by:
nextDouble in class AbstractDistribution

nextDouble

public double nextDouble(double a)
Returns a random number from the distribution; bypasses the internal state.


setState

public void setState(double p)
Sets the distribution parameter.


staticNextDouble

public static double staticNextDouble(double p)
Returns a random number from the distribution.


toString

public java.lang.String toString()
Returns a String representation of the receiver.

Overrides:
toString in class java.lang.Object