sim.util.distribution
Class Logarithmic

java.lang.Object
  extended by sim.util.distribution.AbstractDistribution
      extended by sim.util.distribution.AbstractContinousDistribution
          extended by sim.util.distribution.Logarithmic
All Implemented Interfaces:
java.io.Serializable

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.

See Also:
Serialized Form

Field Summary
protected  double my_p
           
 
Fields inherited from class sim.util.distribution.AbstractDistribution
randomGenerator
 
Constructor Summary
Logarithmic(double p, MersenneTwisterFast 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.
 java.lang.String toString()
          Returns a String representation of the receiver.
 
Methods inherited from class sim.util.distribution.AbstractDistribution
apply, apply, getRandomGenerator, nextInt, setRandomGenerator
 
Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait
 

Field Detail

my_p

protected double my_p
Constructor Detail

Logarithmic

public Logarithmic(double p,
                   MersenneTwisterFast 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.


toString

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

Overrides:
toString in class java.lang.Object