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SSJ V. labo. |
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java.lang.Objectumontreal.iro.lecuyer.rng.RandomStreamBase
umontreal.iro.lecuyer.rng.LFSR113
public class LFSR113
LFSR113
Extends RandomStreamBase using a composite linear feedback shift register (LFSR) (or Tausworthe) RNG as defined in[#!rLEC96a!#,#!rTEZ91b!#]. This generator is the LFSR113 proposed by[#!rLEC99a!#]. It has four 32-bit components combined by a bitwise xor. Its period length is approximatively 2^113 . The values of V, W and Z are 235, 255 and 290 respectively (see RandomStream for their definition). The seed of the RNG, and the state of a stream at any given step, are four-dimensional vectors of 32-bit integers. The default initial seed of the RNG is 1(987654321, 987654321, 987654321, 987654321). The nextValue method returns numbers with 32 bits of precision.
Constructor Summary | |
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LFSR113()
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LFSR113(String name)
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Method Summary | |
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LFSR113 |
clone()
. |
int[] |
getState()
. |
int |
nextInt(int i,
int j)
Calls nextDouble once to create one integer between i and j. |
void |
resetNextSubstream()
Reinitializes the stream to the beginning of its next substream: Ng is computed, and Cg and Bg are set to Ng. |
void |
resetStartStream()
Reinitializes the stream to its initial state Ig: Cg and Bg are set to Ig. |
void |
resetStartSubstream()
Reinitializes the stream to the beginning of its current substream: Cg is set to Bg. |
static void |
setPackageSeed(int[] seed)
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void |
setSeed(int[] seed)
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String |
toString()
Returns a string containing the current state of this stream. |
Methods inherited from class umontreal.iro.lecuyer.rng.RandomStreamBase |
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formatState, formatStateFull, increasedPrecision, nextArrayOfDouble, nextArrayOfInt, nextDouble |
Methods inherited from class java.lang.Object |
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equals, getClass, hashCode, notify, notifyAll, wait, wait, wait |
Constructor Detail |
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public LFSR113()
public LFSR113(String name)
Method Detail |
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public static void setPackageSeed(int[] seed)
public void setSeed(int[] seed)
public int[] getState()
public LFSR113 clone()
clone
in interface CloneableRandomStream
clone
in class RandomStreamBase
public void resetStartStream()
RandomStream
resetStartStream
in interface RandomStream
resetStartStream
in class RandomStreamBase
public void resetStartSubstream()
RandomStream
resetStartSubstream
in interface RandomStream
resetStartSubstream
in class RandomStreamBase
public void resetNextSubstream()
RandomStream
resetNextSubstream
in interface RandomStream
resetNextSubstream
in class RandomStreamBase
public String toString()
RandomStream
toString
in interface RandomStream
toString
in class RandomStreamBase
public int nextInt(int i, int j)
RandomStreamBase
nextInt
in interface RandomStream
nextInt
in class RandomStreamBase
i
- the smallest possible returned integerj
- the largest possible returned integer
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SSJ V. labo. |
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