Package it.unimi.dsi.util

Class XorShift1024StarRandom

java.lang.Object

java.util.Random

it.unimi.dsi.util.XorShift1024StarRandom

All Implemented Interfaces:

java.io.Serializable

@Deprecated
public class XorShift1024StarRandom
extends java.util.Random

Deprecated.

Please use XorShift1024StarPhiRandom instead.

A fast, high-quality pseudorandom number generator that combines a long-period instance of George Marsaglia's Xorshift generators (described in “Xorshift RNGs”, Journal of Statistical Software, 8:1−6, 2003) with a multiplication.

See Also:

it.unimi.dsi.util, Random, Serialized Form

Constructor Summary

Constructors

Constructor	Description
XorShift1024StarRandom()	Deprecated. Creates a new generator seeded using Util.randomSeed().
XorShift1024StarRandom(long seed)	Deprecated. Creates a new generator using a given seed.

Method Summary

Modifier and Type	Method	Description
void	jump()	Deprecated. The jump function for this generator.
protected int	next(int bits)	Deprecated.
boolean	nextBoolean()	Deprecated.
void	nextBytes(byte[] bytes)	Deprecated.
double	nextDouble()	Deprecated.
float	nextFloat()	Deprecated.
int	nextInt()	Deprecated.
int	nextInt(int n)	Deprecated.
long	nextLong()	Deprecated.
long	nextLong(long n)	Deprecated. Returns a pseudorandom uniformly distributed long value between 0 (inclusive) and the specified value (exclusive), drawn from this random number generator's sequence.
void	setSeed(long seed)	Deprecated. Sets the seed of this generator.
void	setState(long[] state, int p)	Deprecated. Sets the state of this generator.
XorShift1024StarRandom	split()	Deprecated. Returns a new instance that shares no mutable state with this instance.

Methods inherited from class java.lang.Object

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

Methods inherited from class java.util.Random

doubles, doubles, doubles, doubles, ints, ints, ints, ints, longs, longs, longs, longs, nextGaussian

Constructor Detail

XorShift1024StarRandom

public XorShift1024StarRandom()

Deprecated.

Creates a new generator seeded using Util.randomSeed().

XorShift1024StarRandom

public XorShift1024StarRandom(long seed)

Deprecated.

Creates a new generator using a given seed.

Parameters:

seed - a seed for the generator.

Method Detail

next

protected int next(int bits)

Deprecated.

Overrides:

next in class java.util.Random

nextLong

public long nextLong()

Deprecated.

Overrides:

nextLong in class java.util.Random

nextInt

public int nextInt()

Deprecated.

Overrides:

nextInt in class java.util.Random

nextInt

public int nextInt(int n)

Deprecated.

Overrides:

nextInt in class java.util.Random

nextLong

public long nextLong(long n)

Deprecated.

Returns a pseudorandom uniformly distributed long value between 0 (inclusive) and the specified value (exclusive), drawn from this random number generator's sequence. The algorithm used to generate the value guarantees that the result is uniform, provided that the sequence of 64-bit values produced by this generator is.

Parameters:

n - the positive bound on the random number to be returned.

Returns:

the next pseudorandom long value between 0 (inclusive) and n (exclusive).

nextDouble

public double nextDouble()

Deprecated.

Overrides:

nextDouble in class java.util.Random

nextFloat

public float nextFloat()

Deprecated.

Overrides:

nextFloat in class java.util.Random

nextBoolean

public boolean nextBoolean()

Deprecated.

Overrides:

nextBoolean in class java.util.Random

nextBytes

public void nextBytes(byte[] bytes)

Deprecated.

Overrides:

nextBytes in class java.util.Random

jump

public void jump()

Deprecated.

The jump function for this generator. It is equivalent to 2⁵¹² calls to nextLong(); it can be used to generate 2⁵¹² non-overlapping subsequences for parallel computations.

split

public XorShift1024StarRandom split()

Deprecated.

Returns a new instance that shares no mutable state with this instance. The sequence generated by the new instance depends deterministically from the state of this instance, but the probability that the sequence generated by this instance and by the new instance overlap is negligible.

Returns:

the new instance.

setSeed

public void setSeed(long seed)

Deprecated.

Sets the seed of this generator.

The argument will be used to seed a SplitMix64RandomGenerator, whose output will in turn be used to seed this generator. This approach makes “warmup” unnecessary, and makes the probability of starting from a state with a large fraction of bits set to zero astronomically small.

Overrides:

setSeed in class java.util.Random

Parameters:

seed - a seed for this generator.

setState

public void setState(long[] state,
                     int p)

Deprecated.

Sets the state of this generator.

The internal state of the generator will be reset, and the state array filled with the provided array.

Parameters:

state - an array of 16 longs; at least one must be nonzero.

p - the internal index.