Class PcgMcgXshRr32

java.lang.Object

org.apache.commons.rng.core.BaseProvider

org.apache.commons.rng.core.source32.IntProvider

org.apache.commons.rng.core.source32.PcgMcgXshRr32

All Implemented Interfaces:

RandomIntSource, RestorableUniformRandomProvider, UniformRandomProvider

public class PcgMcgXshRr32
extends IntProvider

A Permuted Congruential Generator (PCG) that is composed of a 64-bit Multiplicative Congruential Generator (MCG) combined with the XSH-RR (xorshift; random rotate) output transformation to create 32-bit output.

State size is 64 bits and the period is 2⁶².

Since:

1.3

See Also:

• PCG, A Family of Better Random Number Generators

Constructor Summary

Constructors

Constructor	Description
PcgMcgXshRr32(Long seed)	Creates a new instance.

Method Summary

Modifier and Type	Method	Description
protected byte[]	getStateInternal()	Creates a snapshot of the RNG state.
int	next()	Return the next random value.
protected void	setStateInternal(byte[] s)	Resets the RNG to the given state.
protected int	transform(long x)	Transform the 64-bit state of the generator to a 32-bit output.

Methods inherited from class IntProvider

nextBoolean, nextBytes, nextBytes, nextDouble, nextInt, nextLong, resetCachedState

Methods inherited from class BaseProvider

checkIndex, checkStateSize, composeStateInternal, extendSeed, extendSeed, fillState, fillState, restoreState, saveState, splitStateInternal, toString

Methods inherited from class Object

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

Methods inherited from interface UniformRandomProvider

doubles, doubles, doubles, doubles, ints, ints, ints, ints, longs, longs, longs, longs, nextDouble, nextDouble, nextFloat, nextFloat, nextFloat, nextInt, nextInt, nextLong, nextLong

Constructor Details

PcgMcgXshRr32

public PcgMcgXshRr32(Long seed)

Creates a new instance.

Parameters:

seed - Initial seed.

Method Details

transform

protected int transform(long x)

Transform the 64-bit state of the generator to a 32-bit output. The transformation function shall vary with respect to different generators.

Parameters:

x - State.

Returns:

the output

next

public int next()

Return the next random value.

Returns:

the next random value.

getStateInternal

protected byte[] getStateInternal()

Creates a snapshot of the RNG state.

Overrides:

getStateInternal in class IntProvider

Returns:

the internal state.

setStateInternal

protected void setStateInternal(byte[] s)

Resets the RNG to the given state.

Overrides:

setStateInternal in class IntProvider

Parameters:

s - State (previously obtained by a call to BaseProvider.getStateInternal()).

See Also:

• BaseProvider.checkStateSize(byte[],int)