Package cern.jet.random
Class ExponentialPower
- java.lang.Object
-
- cern.colt.PersistentObject
-
- cern.jet.random.AbstractDistribution
-
- cern.jet.random.AbstractContinousDistribution
-
- cern.jet.random.ExponentialPower
-
- All Implemented Interfaces:
DoubleFunction
,IntFunction
,java.io.Serializable
,java.lang.Cloneable
public class ExponentialPower extends AbstractContinousDistribution
Exponential Power distribution.Valid parameter ranges: tau >= 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: Non-universal rejection method for logconcave densities.
- This is a port of epd.c from the C-RAND / WIN-RAND library. C-RAND's implementation, in turn, is based upon
L. Devroye (1986): Non-Uniform Random Variate Generation , Springer Verlag, New York.
- Version:
- 1.0, 09/24/99
- See Also:
- Serialized Form
-
-
Field Summary
Fields Modifier and Type Field Description private double
s
protected static ExponentialPower
shared
private double
sm1
protected double
tau
private double
tau_set
-
Fields inherited from class cern.jet.random.AbstractDistribution
randomGenerator
-
Fields inherited from class cern.colt.PersistentObject
serialVersionUID
-
-
Constructor Summary
Constructors Constructor Description ExponentialPower(double tau, RandomEngine randomGenerator)
Constructs an Exponential Power distribution.
-
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 tau)
Returns a random number from the distribution; bypasses the internal state.void
setState(double tau)
Sets the distribution parameter.static double
staticNextDouble(double tau)
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
-
-
-
-
Field Detail
-
tau
protected double tau
-
s
private double s
-
sm1
private double sm1
-
tau_set
private double tau_set
-
shared
protected static ExponentialPower shared
-
-
Constructor Detail
-
ExponentialPower
public ExponentialPower(double tau, RandomEngine randomGenerator)
Constructs an Exponential Power distribution. Example: tau=1.0.- Throws:
java.lang.IllegalArgumentException
- if tau < 1.0.
-
-
Method Detail
-
nextDouble
public double nextDouble()
Returns a random number from the distribution.- Specified by:
nextDouble
in classAbstractDistribution
-
nextDouble
public double nextDouble(double tau)
Returns a random number from the distribution; bypasses the internal state.- Throws:
java.lang.IllegalArgumentException
- if tau < 1.0.
-
setState
public void setState(double tau)
Sets the distribution parameter.- Throws:
java.lang.IllegalArgumentException
- if tau < 1.0.
-
staticNextDouble
public static double staticNextDouble(double tau)
Returns a random number from the distribution.- Throws:
java.lang.IllegalArgumentException
- if tau < 1.0.
-
toString
public java.lang.String toString()
Returns a String representation of the receiver.- Overrides:
toString
in classjava.lang.Object
-
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.
-
-