ChengBetaSampler (VirtualDataSet API)

java.lang.Object
- org.apache.commons.rng.sampling.distribution.SamplerBase
- - org.apache.commons.rng.sampling.distribution.ChengBetaSampler

All Implemented Interfaces:: ContinuousSampler

public class ChengBetaSampler
extends SamplerBase
implements ContinuousSampler

Utility class implementing Cheng's algorithms for beta distribution sampling.

 R. C. H. Cheng,
 "Generating beta variates with nonintegral shape parameters",
 Communications of the ACM, 21, 317-322, 1978.

Sampling uses UniformRandomProvider.nextDouble().

Since:: 1.0

- Constructor Summary
  
  Constructors
  Constructor Description
  
  ChengBetaSampler(UniformRandomProvider rng, double alpha, double beta)
  Creates a sampler instance.
- Method Summary
  
  Modifier and Type Method Description
  
  double sample()
  Creates a sample.
  
  java.lang.String toString()
  - Methods inherited from class org.apache.commons.rng.sampling.distribution.SamplerBase
    nextDouble, nextInt, nextInt, nextLong
  - Methods inherited from class java.lang.Object
    clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait

- Constructor Detail
  - ChengBetaSampler
```
public ChengBetaSampler(UniformRandomProvider rng,
                        double alpha,
                        double beta)
```
    Creates a sampler instance.
    
    Parameters:
    
    rng - Generator of uniformly distributed random numbers.
    
    alpha - Distribution first shape parameter.
    
    beta - Distribution second shape parameter.
    
    Throws:
    
    java.lang.IllegalArgumentException - if alpha <= 0 or beta <= 0
- Method Detail
  - sample
```
public double sample()
```
    Creates a sample.
    
    Specified by:
    
    sample in interface ContinuousSampler
    
    Returns:
    
    a sample.
  - toString
```
public java.lang.String toString()
```
    Overrides:
    
    toString in class SamplerBase