com.numericalmethod.suanshu.stats.random.pseudorandom.linear
Class CombinedLinearCongruentialGenerator

java.lang.Object
  com.numericalmethod.suanshu.stats.random.pseudorandom.linear.CombinedLinearCongruentialGenerator

All Implemented Interfaces:

LinearCongruentialGenerator, RandomLongGenerator, RandomNumberGenerator

public class CombinedLinearCongruentialGenerator
extends java.lang.Object
implements LinearCongruentialGenerator

This class takes a number of simple LinearCongruentialGenerator, such as Lehmer, to form one longer period generator by first summing values and then taking modulus. The resultant generator in general has a superior uniformity and longer period, without overflowing the arithmetics.

Constructor Summary

CombinedLinearCongruentialGenerator(LinearCongruentialGenerator[] rng)
Construct a linear congruential generator from some simpler and shorter modulus generators.

Method Summary

long	modulus() Get the modulus of this linear congruential generator.
double	nextDouble() Get the next random double between 0 and 1.
long	nextLong() Get the next random long.
int	order() Get the order of recursion.
void	seed(long... seeds) Seed the random number generator to produce repeatable sequences.

Methods inherited from class java.lang.Object

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

Constructor Detail

CombinedLinearCongruentialGenerator

public CombinedLinearCongruentialGenerator(LinearCongruentialGenerator[] rng)

Construct a linear congruential generator from some simpler and shorter modulus generators.

Parameters:

rng - an array of LinearCongruentialGenerators

Method Detail

seed

public void seed(long... seeds)

Description copied from interface: RandomNumberGenerator

Seed the random number generator to produce repeatable sequences.

Specified by:

seed in interface RandomNumberGenerator

Parameters:

seeds - the seeds

order

public int order()

Description copied from interface: LinearCongruentialGenerator

Get the order of recursion.

Specified by:

order in interface LinearCongruentialGenerator

Returns:

the order of recursion

modulus

public long modulus()

Description copied from interface: LinearCongruentialGenerator

Get the modulus of this linear congruential generator.

Specified by:

modulus in interface LinearCongruentialGenerator

Returns:

m

nextLong

public long nextLong()

Description copied from interface: RandomLongGenerator

Get the next random long.

Specified by:

nextLong in interface RandomLongGenerator

Returns:

the next random long

nextDouble

public double nextDouble()

Get the next random double between 0 and 1.

Specified by:

nextDouble in interface RandomNumberGenerator

Returns:

the next random number between 0 and 1