com.numericalmethod.suanshu.stats.random.univariate.uniform

Class SHR3

java.lang.Object

com.numericalmethod.suanshu.stats.random.univariate.uniform.SHR3

All Implemented Interfaces:

RandomLongGenerator, RandomNumberGenerator, java.io.Serializable

public class SHR3
extends java.lang.Object
implements RandomLongGenerator

SHR3 is a 3-shift-register generator with period 2^32-1. It uses y(n)=y(n-1)(I+L^17)(I+R^13)(I+L^5), with the y's viewed as binary vectors, L the 32x32 binary matrix that shifts a vector left 1, and R its transpose. SHR3 seems to pass all tests except those related to the binary rank test, since 32 successive values, as binary vectors, must be linearly independent, while 32 successive truly random 32-bit integers, viewed as binary vectors, will be linearly independent only about 29% of the time.

See Also:

Serialized Form

Constructor Summary

Constructors

Constructor and Description
SHR3()

Method Summary

Modifier and Type	Method and Description
double	nextDouble() Get the next random double.
int	nextInt()
long	nextLong() Get the next random long.
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

SHR3

public SHR3()

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

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()

Description copied from interface: RandomNumberGenerator

Get the next random double.

Specified by:

nextDouble in interface RandomNumberGenerator

Returns:

the next random number

nextInt

public int nextInt()