edu.rit.util
Class Mcg1Random

java.lang.Object
  edu.rit.util.Random
      edu.rit.util.Mcg1Random

All Implemented Interfaces:

Serializable

public class Mcg1Random
extends Random

Class Mcg1Random provides a default pseudorandom number generator (PRNG) designed for use in parallel scientific programming. To create an instance of class Mcg1Random, either use the Mcg1Random() constructor, or use the static getInstance(long,String) method in class Random.

Class Mcg1Random uses L'Ecuyer's 63-bit multiplicative congruential generator:

     seed := seed * A (mod M);
 

with A = 2307085864 and M = 2⁶³-25. For further information, see P. L'Ecuyer, F. Blouin, and R. Couture, A search for good multiple recursive random number generators, ACM Transactions on Modeling and Computer Simulation, 3(2):87-98, April 1993.

See Also:

Serialized Form

Constructor Summary

Mcg1Random(long seed)
Construct a new PRNG with the given seed.

Method Summary

protected long	next() Return the next 64-bit pseudorandom value in this PRNG's sequence.
protected long	next(long skip) Return the 64-bit pseudorandom value the given number of positions ahead in this PRNG's sequence.
void	setSeed(long seed) Set this PRNG's seed.

Methods inherited from class edu.rit.util.Random

getInstance, getInstance, nextBoolean, nextBoolean, nextByte, nextByte, nextCharacter, nextCharacter, nextDouble, nextDouble, nextFloat, nextFloat, nextInt, nextInt, nextInteger, nextInteger, nextLong, nextLong, nextShort, nextShort, nextUnsignedByte, nextUnsignedByte, nextUnsignedShort, nextUnsignedShort, skip, skip

Methods inherited from class java.lang.Object

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

Constructor Detail

Mcg1Random

public Mcg1Random(long seed)

Construct a new PRNG with the given seed. The seed must not be 0.

Parameters:

seed - Seed.

Throws:

IllegalArgumentException - (unchecked exception) Thrown if seed = 0.

Method Detail

setSeed

public void setSeed(long seed)

Set this PRNG's seed. The seed must not be 0.

Specified by:

setSeed in class Random

Parameters:

seed - Seed.

Throws:

IllegalArgumentException - (unchecked exception) Thrown if seed = 0.

next

protected long next()

Return the next 64-bit pseudorandom value in this PRNG's sequence.

Specified by:

next in class Random

Returns:

Pseudorandom value.

next

protected long next(long skip)

Return the 64-bit pseudorandom value the given number of positions ahead in this PRNG's sequence.

Specified by:

next in class Random

Parameters:

skip - Number of positions to skip, assumed to be > 0.

Returns:

Pseudorandom value.