Package cern.jet.random
Class Logarithmic
- java.lang.Object
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- cern.colt.PersistentObject
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- cern.jet.random.AbstractDistribution
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- cern.jet.random.AbstractContinousDistribution
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- cern.jet.random.Logarithmic
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- 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.
- Version:
- 1.0, 09/24/99
- See Also:
- Serialized Form
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Field Summary
Fields Modifier and Type Field Description private double
a_prev
private double
h
protected double
my_p
protected static Logarithmic
shared
private double
t
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Fields inherited from class cern.jet.random.AbstractDistribution
randomGenerator
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Fields inherited from class cern.colt.PersistentObject
serialVersionUID
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Constructor Summary
Constructors Constructor Description Logarithmic(double p, RandomEngine randomGenerator)
Constructs a Logarithmic distribution.
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Method Summary
All Methods Static Methods Instance Methods Concrete Methods Modifier and Type Method Description 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.private static void
xstaticSetRandomGenerator(RandomEngine randomGenerator)
Sets the uniform random number generated shared by all static methods.-
Methods inherited from class cern.jet.random.AbstractDistribution
apply, apply, clone, getRandomGenerator, makeDefaultGenerator, nextInt, setRandomGenerator
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Field Detail
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my_p
protected double my_p
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t
private double t
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h
private double h
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a_prev
private double a_prev
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shared
protected static Logarithmic shared
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Constructor Detail
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Logarithmic
public Logarithmic(double p, RandomEngine randomGenerator)
Constructs a Logarithmic distribution.
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Method Detail
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nextDouble
public double nextDouble()
Returns a random number from the distribution.- Specified by:
nextDouble
in classAbstractDistribution
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nextDouble
public double nextDouble(double a)
Returns a random number from the distribution; bypasses the internal state.
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setState
public void setState(double p)
Sets the distribution parameter.
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staticNextDouble
public static double staticNextDouble(double p)
Returns a random number from the distribution.
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toString
public java.lang.String toString()
Returns a String representation of the receiver.- Overrides:
toString
in classjava.lang.Object
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xstaticSetRandomGenerator
private static void xstaticSetRandomGenerator(RandomEngine randomGenerator)
Sets the uniform random number generated shared by all static methods.- Parameters:
randomGenerator
- the new uniform random number generator to be shared.
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