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java.lang.Objectorg.apache.mahout.math.function.DoubleFunction
org.apache.mahout.math.jet.random.AbstractDistribution
org.apache.mahout.math.jet.random.AbstractContinousDistribution
org.apache.mahout.math.jet.random.Gamma
public class Gamma
| Constructor Summary | |
|---|---|
Gamma(double alpha,
double rate,
Random randomGenerator)
Constructs a Gamma distribution with a given shape (alpha) and rate (beta). |
|
| Method Summary | |
|---|---|
double |
cdf(double x)
Returns the cumulative distribution function. |
static double |
logGamma(double x)
Returns a quick approximation of log(gamma(x)). |
double |
nextDouble()
Returns a random number from the distribution. |
double |
nextDouble(double alpha,
double rate)
Returns a random number from the distribution; bypasses the internal state. |
double |
pdf(double x)
Returns the probability distribution function. |
String |
toString()
|
| Methods inherited from class org.apache.mahout.math.jet.random.AbstractContinousDistribution |
|---|
nextInt |
| Methods inherited from class org.apache.mahout.math.jet.random.AbstractDistribution |
|---|
apply, apply, getRandomGenerator, randomDouble, setRandomGenerator |
| Methods inherited from class org.apache.mahout.math.function.DoubleFunction |
|---|
isDensifying |
| Methods inherited from class java.lang.Object |
|---|
clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait |
| Constructor Detail |
|---|
public Gamma(double alpha,
double rate,
Random randomGenerator)
alpha - The shape parameter.rate - The rate parameter.randomGenerator - The random number generator that generates bits for us.
IllegalArgumentException - if alpha <= 0.0 || alpha <= 0.0.| Method Detail |
|---|
public double cdf(double x)
cdf in class AbstractContinousDistributionx - The end-point where the cumulation should end.public double nextDouble()
nextDouble in class AbstractDistribution
public double nextDouble(double alpha,
double rate)
alpha - Shape parameter.rate - Rate parameter (=1/scale).
public double pdf(double x)
pdf in class AbstractContinousDistributionx - Where to compute the density function.
public String toString()
toString in class Objectpublic static double logGamma(double x)
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