Class DotyHumphreySmallFastCounting32

java.lang.Object
org.apache.commons.rng.core.BaseProvider
org.apache.commons.rng.core.source32.IntProvider
org.apache.commons.rng.core.source32.DotyHumphreySmallFastCounting32
All Implemented Interfaces:
RandomIntSource, RestorableUniformRandomProvider, UniformRandomProvider

public class DotyHumphreySmallFastCounting32 extends IntProvider
Implement the Small, Fast, Counting (SFC) 32-bit generator of Chris Doty-Humphrey. The original source is the PractRand test suite by the same author.

The state size is 128-bits; the period is a minimum of 232 and an average of approximately 2127.

Since:
1.3
See Also:
  • Field Details

    • SEED_SIZE

      private static final int SEED_SIZE
      Size of the seed.
      See Also:
    • a

      private int a
      State a.
    • b

      private int b
      State b.
    • c

      private int c
      State c.
    • counter

      private int counter
      Counter.
  • Constructor Details

    • DotyHumphreySmallFastCounting32

      public DotyHumphreySmallFastCounting32(int[] seed)
      Creates an instance with the given seed.
      Parameters:
      seed - Initial seed. If the length is larger than 3, only the first 3 elements will be used; if smaller, the remaining elements will be automatically set.
  • Method Details

    • setSeedInternal

      private void setSeedInternal(int[] seed)
      Seeds the RNG.
      Parameters:
      seed - Seed.
    • next

      public final int next()
      Returns:
      the next random value.
    • getStateInternal

      protected byte[] getStateInternal()
      Creates a snapshot of the RNG state.
      Overrides:
      getStateInternal in class IntProvider
      Returns:
      the internal state.
    • setStateInternal

      protected void setStateInternal(byte[] s)
      Resets the RNG to the given state.
      Overrides:
      setStateInternal in class IntProvider
      Parameters:
      s - State (previously obtained by a call to BaseProvider.getStateInternal()).
      See Also: