de.jstacs.utils.random
Class ErlangMRGParams

java.lang.Object
  de.jstacs.utils.random.MRGParams
      de.jstacs.utils.random.ErlangMRGParams

public class ErlangMRGParams
extends MRGParams

The container for parameters of an Erlang multivariate random generator.

Author:

Jens Keilwagen

See Also:

MRGParams

Constructor Summary

ErlangMRGParams(int[] alpha)
Constructor which creates a new hyperparameter vector for an Erlang random generator.

ErlangMRGParams(int alpha, int n)
Constructor which creates a new hyperparameter vector for an Erlang random generator.

Method Summary

int	getDimension() Returns the dimension of the hyperparameter vector of the underlying Erlang distribution.
int	getHyperparameter(int i) Returns the value at position i of the hyperparameter vector of the underlying Erlang distribution.
int	getSumOfHyperparameter() Returns the sum of the hyperparameters (entries of the hyperparameter vector) of the underlying Erlang distribution.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

ErlangMRGParams

public ErlangMRGParams(int alpha,
                       int n)
                throws IllegalArgumentException

Constructor which creates a new hyperparameter vector for an Erlang random generator. The hyperparameter vector of the underlying Erlang distribution consists of the same value at every position.

Parameters:

alpha - the value for the hyperparameter vector

n - the dimension of the hyperparameter vector

Throws:

IllegalArgumentException - if n is chosen incorrectly (has to be greater than 2) or if alpha is chosen incorrectly (has to be positive)

ErlangMRGParams

public ErlangMRGParams(int[] alpha)
                throws IllegalArgumentException

Constructor which creates a new hyperparameter vector for an Erlang random generator.

Parameters:

alpha - the hyperparameter vector

Throws:

IllegalArgumentException - if at least one of the hyperparameters is not positive

Method Detail

getDimension

public int getDimension()

Returns the dimension of the hyperparameter vector of the underlying Erlang distribution.

Returns:

the dimension of the hyperparameter vector of the underlying Erlang distribution

getHyperparameter

public int getHyperparameter(int i)

Returns the value at position i of the hyperparameter vector of the underlying Erlang distribution.

Parameters:

i - the position of the hyperparameter vector

Returns:

the value at position i of the hyperparameter vector of the underlying Erlang distribution

getSumOfHyperparameter

public int getSumOfHyperparameter()

Returns the sum of the hyperparameters (entries of the hyperparameter vector) of the underlying Erlang distribution.

Returns:

the sum of the hyperparameters (entries of the hyperparameter vector) of the underlying Erlang distribution