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java.lang.Objectumontreal.iro.lecuyer.rng.RandomStreamBase
umontreal.iro.lecuyer.rng.WELL607
public class WELL607
This class implements the RandomStream
interface via inheritance
from RandomStreamBase
. The backbone generator is a Well
Equidistributed Long period Linear Random Number Generator (WELL),
proposed by F. Panneton.
The implemented generator is the WELL607, which has a state
size of 607 bits
and a period length of approximatively
2607. The values of V, W and Z are 2150,
2250 and 2400 respectively (see RandomStream
for their
definition). The seed of the RNG, and the state of a stream at any given
step, is a 19-dimensional vector of 32-bit integers.
The output of nextValue has 32 bits of precision.
This implementation requires the use of about 100K of memory to run. This memory is shared between all instances of the class, and is only loaded when the first instance is created.
Constructor Summary | |
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WELL607()
Constructs a new stream. |
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WELL607(String name)
Constructs a new stream with the identifier name (used in the toString method). |
Method Summary | |
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int[] |
getState()
Returns the current state of the stream, represented as an array of 19 integers. |
static void |
main(String[] args)
This method is only meant to be used during the compilation process. |
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 of the class WELL607 to the 19 integers of the vector seed[0..18]. |
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, nextInt |
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 WELL607()
public WELL607(String name)
name
- name of the streamMethod Detail |
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public static void setPackageSeed(int[] seed)
seed
- array of 19 elements representing the seedpublic void setSeed(int[] seed)
seed
- array of 19 elements representing the seedpublic int[] getState()
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 static void main(String[] args)
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