math.rng

Class XorShift64Star

java.lang.Object

math.rng.AbstractRng64

math.rng.XorShift64Star

All Implemented Interfaces:

PseudoRandom, PseudoRandomStream

public class XorShift64Star
extends AbstractRng64

64-bit Xorshift* pseudo random generator by George Marsaglia (2003).

A faster and statistically better pseudo RNG than Random This generator has a period of 2⁶⁴ − 1.

At least the two lowest bits of a xorshift* generator satisfy a linear recurrence and will therefore fail linearity tests (MatrixRank and LinearComp in TestU01) which were designed to catch these linear relations. However, low linear complexity of the lowest bits has rarely an effect in practice, and certainly has no impact at all when the generator is only used to generate floating-point numbers.

This generator is 1-dimensionally equidistributed.

Field Summary

Fields

Modifier and Type	Field and Description
protected long	seed

Fields inherited from class math.rng.AbstractRng64

DOUBLE_NORM, FLOAT_NORM, nextGaussian, unused

Constructor Summary

Constructors

Constructor and Description
XorShift64Star()
XorShift64Star(long seed)
XorShift64Star(long[] seed)

Method Summary

Modifier and Type	Method and Description
static PseudoRandom	getDefault()
long	nextLong()

Methods inherited from class math.rng.AbstractRng64

beta, beta, cauchy, cauchy, chiSquare, chiSquare, doubles, doubles, doubles, doubles, exponential, exponential, gamma, gamma, getAlgorithm, getSeed, ints, ints, ints, ints, logNormal, logNormal, longs, longs, longs, longs, next, nextBoolean, nextBytes, nextDouble, nextDouble, nextDoubles, nextFloat, nextFloat, nextGaussian, nextGaussian, nextInt, nextInt, nextInt, nextLong, nextLong, nextLongs, normal, normal, saveSeed, saveSeed, studentT, studentT, weibull, weibull

Methods inherited from class java.lang.Object

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

Field Detail

seed

protected long seed

Constructor Detail

XorShift64Star

public XorShift64Star()

XorShift64Star

public XorShift64Star(long seed)

XorShift64Star

public XorShift64Star(long[] seed)

Method Detail

nextLong

public final long nextLong()

Specified by:

nextLong in interface PseudoRandom

Specified by:

nextLong in class AbstractRng64

getDefault

public static PseudoRandom getDefault()