org.hipparchus.random

Class AbstractWell.IndexTable

java.lang.Object

org.hipparchus.random.AbstractWell.IndexTable

Enclosing class:

AbstractWell

protected static final class AbstractWell.IndexTable
extends Object

Inner class used to store the indirection index table which is fixed for a given type of WELL class of pseudo-random number generator.

Constructor Summary

Constructors

Constructor and Description
IndexTable(int k, int m1, int m2, int m3) Creates a new pre-calculated indirection index table.

Method Summary

Modifier and Type	Method and Description
int	getIndexM1(int index) Returns index + M1 modulo the table size.
int	getIndexM2(int index) Returns index + M2 modulo the table size.
int	getIndexM3(int index) Returns index + M3 modulo the table size.
int	getIndexPred(int index) Returns the predecessor of the given index modulo the table size.
int	getIndexPred2(int index) Returns the second predecessor of the given index modulo the table size.

Methods inherited from class java.lang.Object

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

Constructor Detail

IndexTable

public IndexTable(int k,
                  int m1,
                  int m2,
                  int m3)

Creates a new pre-calculated indirection index table.

Parameters:

k - number of bits in the pool (not necessarily a multiple of 32)

m1 - first parameter of the algorithm

m2 - second parameter of the algorithm

m3 - third parameter of the algorithm

Method Detail

getIndexPred

public int getIndexPred(int index)

Returns the predecessor of the given index modulo the table size.

Parameters:

index - the index to look at

Returns:

(index - 1) % table size

getIndexPred2

public int getIndexPred2(int index)

Returns the second predecessor of the given index modulo the table size.

Parameters:

index - the index to look at

Returns:

(index - 2) % table size

getIndexM1

public int getIndexM1(int index)

Returns index + M1 modulo the table size.

Parameters:

index - the index to look at

Returns:

(index + M1) % table size

getIndexM2

public int getIndexM2(int index)

Returns index + M2 modulo the table size.

Parameters:

index - the index to look at

Returns:

(index + M2) % table size

getIndexM3

public int getIndexM3(int index)

Returns index + M3 modulo the table size.

Parameters:

index - the index to look at

Returns:

(index + M3) % table size