etomica.util
Class RandomMersenneTwister

java.lang.Object
  etomica.util.RandomMersenneTwister

All Implemented Interfaces:

IRandom

public class RandomMersenneTwister
extends Object
implements IRandom

Mersenne Twister RNG. seed initialization and nextInt() methods written in C by Takuji Nishimura and Makoto Matsumoto as described above, and translated into Java. Other methods added for the Java version.

Field Summary

protected boolean	hasNextGaussian
protected static int	LOWER_MASK
protected static int	M
protected static int	MATRIX_A
protected int[]	mt
protected int	mti
protected static int	N
protected double	nextGaussian
protected static int	UPPER_MASK

Constructor Summary

RandomMersenneTwister(int s)
Creates a Mersenne Twister with the given seed.

RandomMersenneTwister(int[] s)
Creates a Mersenne Twister with the given array of seeds.

Method Summary

double	nextDouble() Returns a pseudorandom double, uniformly distributed between 0.0 (inclusive) and 1.0 (exclusive).
float	nextFloat()
double	nextGaussian() Returns a pseudorandom double, Gaussian ("normally") distributed value with mean 0.0 and standard deviation 1.0.
int	nextInt()
int	nextInt(int max) Returns a random int ranging from 0 to max-1.
long	nextLong()
void	setSeed(int s) Configures the RNG with the given seed.
void	setSeedArray(int[] init_key) Configures the RNG with an array of seeds

Methods inherited from class java.lang.Object

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

Field Detail

N

protected static final int N

See Also:

Constant Field Values

M

protected static final int M

See Also:

Constant Field Values

MATRIX_A

protected static final int MATRIX_A

See Also:

Constant Field Values

UPPER_MASK

protected static final int UPPER_MASK

See Also:

Constant Field Values

LOWER_MASK

protected static final int LOWER_MASK

See Also:

Constant Field Values

mt

protected final int[] mt

mti

protected int mti

hasNextGaussian

protected boolean hasNextGaussian

nextGaussian

protected double nextGaussian

Constructor Detail

RandomMersenneTwister

public RandomMersenneTwister(int s)

Creates a Mersenne Twister with the given seed.

RandomMersenneTwister

public RandomMersenneTwister(int[] s)

Creates a Mersenne Twister with the given array of seeds.

Method Detail

setSeed

public void setSeed(int s)

Configures the RNG with the given seed.

setSeedArray

public void setSeedArray(int[] init_key)

Configures the RNG with an array of seeds

nextInt

public int nextInt()

nextLong

public long nextLong()

nextInt

public int nextInt(int max)

Returns a random int ranging from 0 to max-1.

Specified by:

nextInt in interface IRandom

nextDouble

public double nextDouble()

Description copied from interface: IRandom

Returns a pseudorandom double, uniformly distributed between 0.0 (inclusive) and 1.0 (exclusive).

Specified by:

nextDouble in interface IRandom

nextGaussian

public double nextGaussian()

Description copied from interface: IRandom

Returns a pseudorandom double, Gaussian ("normally") distributed value with mean 0.0 and standard deviation 1.0.

Specified by:

nextGaussian in interface IRandom

nextFloat

public float nextFloat()