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SSJ V. 2.6.2. |
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java.lang.Object umontreal.iro.lecuyer.rng.RandomStreamBase umontreal.iro.lecuyer.rng.LFSR113
public class LFSR113
Extends RandomStreamBase
using a composite linear feedback
shift register (LFSR) (or Tausworthe) RNG as defined in.
This generator is the LFSR113 proposed by.
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()
Constructs a new stream. |
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LFSR113(String name)
Constructs a new stream with the identifier name. |
Method Summary | |
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LFSR113 |
clone()
Clones the current generator and return its copy. |
int[] |
getState()
Returns the current state of the stream, represented as an array of four integers. |
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)
Sets the initial seed for the class LFSR113 to the four integers of the vector seed[0..3]. |
void |
setSeed(int[] seed)
This method is discouraged for normal use. |
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)
name
- name of the streamMethod Detail |
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public static void setPackageSeed(int[] seed)
seed
- array of 4 elements representing the seedpublic void setSeed(int[] seed)
seed
- array of 4 elements representing the seedpublic 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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