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java.lang.Objectimagescience.random.GammaGenerator
public class GammaGenerator
Gamma random number generator of positive integer order. This implementation is based on the algorithm described by W. H. Press, S. A. Teukolsky, W. T. Vetterling, B. P. Flannery, Numerical Recipes in C: The Art of Scientific Computing (2nd edition), Cambridge University Press, Cambridge, 1992, Section 7.3, and uses UniformGenerator
as a source of uniform random numbers.
Constructor Summary | |
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GammaGenerator()
Constructs a generator of random numbers from the first-order gamma distribution initialized with a random seed |
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GammaGenerator(int order)
Constructs a generator of random numbers from the gamma distribution with given order and initialized with a random seed. |
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GammaGenerator(int order,
int seed)
Constructs a generator of random numbers from the gamma distribution with given order and initialized with the given seed . |
Method Summary | |
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double |
next()
Returns a random number from the gamma distribution with order specified at construction. |
double |
next(int order)
Returns a random number from the gamma distribution with given order . |
Methods inherited from class java.lang.Object |
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equals, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait |
Constructor Detail |
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public GammaGenerator()
public GammaGenerator(int order)
order
and initialized with a random seed.
order
- The order of the gamma distribution. Must be larger than 0
.
java.lang.IllegalArgumentException
- If order
is less than or equal to 0
.public GammaGenerator(int order, int seed)
order
and initialized with the given seed
.
order
- The order of the gamma distribution. Must be larger than 0
.seed
- The seed used for initialization of the generator.
java.lang.IllegalArgumentException
- If order
is less than or equal to 0
.Method Detail |
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public double next()
next
in interface RandomGenerator
public double next(int order)
order
.
order
.
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Copyright (C) Erik Meijering. Permission to use this software and corresponding documentation for educational, research, and not-for-profit purposes, without a fee and without a signed licensing agreement, is granted, subject to the following terms and conditions.
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