Class edu.cornell.lassp.houle.RngPack.RandomSeedable
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Class edu.cornell.lassp.houle.RngPack.RandomSeedable

java.lang.Object
   |
   +----edu.cornell.lassp.houle.RngPack.RandomElement
           |
           +----edu.cornell.lassp.houle.RngPack.RandomSeedable

public class RandomSeedable
extends RandomElement
RandomSeedable is an abstract class that extends the RandomElement class to include the ability to automatically generate a valid long seed from the clock. Thus it provides a consistent interface for seeding interchangable generators. It is reccomended that a RandomSeedable have a constructor that takes a long for a seed. For example, if you write a generator called ReallyRandom, you want to be able to do
long seed=ReallyRandom.ClockSeed();
RandomSeedable e=new ReallyRandom(seed);
this makes it convenient to keep a copy of the seed in case you want to restart the generator with the same seed some time in the future.

If one is going to use a long to generate a smaller seed by taking Clockseed() modulus another number, we reccomend that you use a prime number; this ensures that the generator would have the maximum "period" if it were started at regular issues, for instance, by a batch job. See Ranmar for an example.

Source code is available.

Version:
1.0
Author:
Paul Houle (E-mail: houle@msc.cornell.edu)
See Also:
Ranecu, Ranlux, Ranmar

Constructor Index

 o RandomSeedable()

Method Index

 o ClockSeed(Date)
Return a long integer seed given a date
 o ClockSeed()
Return a long integer seed calculated from the date.

Constructors

 o RandomSeedable
  public RandomSeedable()

Methods

 o ClockSeed
  public static long ClockSeed(Date d)
Return a long integer seed given a date
Parameters:
d - a date
Returns:
a long integer seed
 o ClockSeed
  public static long ClockSeed()
Return a long integer seed calculated from the date. Equivalent to ClockSeed(new Date());
Returns:
a long integer seed

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