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SSJ  V. 2.6.  | 
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java.lang.Objectumontreal.iro.lecuyer.randvar.RandomVariateGen
umontreal.iro.lecuyer.randvar.InverseGammaGen
public class InverseGammaGen
This class implements random variate generators for the inverse gamma distribution with shape parameter α > 0 and scale parameter β > 0. The density function of this distribution is
| Constructor Summary | |
|---|---|
InverseGammaGen(RandomStream s,
                double alpha)
Creates an inverse gamma random variate generator with parameters α = alpha and β = 1, using stream s.  | 
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InverseGammaGen(RandomStream s,
                double alpha,
                double beta)
Creates an inverse gamma random variate generator with parameters α = alpha and β = beta, using stream s.  | 
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InverseGammaGen(RandomStream s,
                InverseGammaDist dist)
Creates a new generator for the distribution dist, using stream s.  | 
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| Method Summary | |
|---|---|
 double | 
getAlpha()
Returns the parameter α of this object.  | 
 double | 
getBeta()
Returns the parameter β of this object.  | 
static double | 
nextDouble(RandomStream s,
           double alpha,
           double beta)
Generates a variate from the inverse gamma distribution with shape parameter α > 0 and scale parameter β > 0.  | 
| Methods inherited from class umontreal.iro.lecuyer.randvar.RandomVariateGen | 
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getDistribution, getStream, nextArrayOfDouble, nextDouble, setStream, toString | 
| Methods inherited from class java.lang.Object | 
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equals, getClass, hashCode, notify, notifyAll, wait, wait, wait | 
| Constructor Detail | 
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public InverseGammaGen(RandomStream s,
                       double alpha,
                       double beta)
public InverseGammaGen(RandomStream s,
                       double alpha)
public InverseGammaGen(RandomStream s,
                       InverseGammaDist dist)
| Method Detail | 
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public static double nextDouble(RandomStream s,
                                double alpha,
                                double beta)
public double getAlpha()
public double getBeta()
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SSJ  V. 2.6.  | 
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