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java.lang.Object umontreal.iro.lecuyer.rng.RandomStreamBase umontreal.iro.lecuyer.rng.F2NL607
public class F2NL607
Implements the RandomStream
interface by using as a backbone
generator the combination of the WELL607 proposed in
(and implemented in WELL607
) with a nonlinear generator.
This nonlinear generator is made up of a small number of components (say n)
combined via addition modulo 1. Each component contains an array already
filled with a ``random'' permutation of
{0,..., s  1} where s is the
size of the array.
These numbers and the lengths of the components can be changed by the user.
Each call to the generator uses the next number in each array
(or the first one if we are at the end of the array). By default,
there are 3 components of lengths 1019, 1021, and 1031, respectively.
The nonlinear generator is combined with the WELL using a bitwise XOR operation.
This ensures that the new generator has at least as much equidistribution
as the WELL607, as shown in.
The combined generator has a period length of approximatively
2^{637}. The values of V, W and Z
are 2^{250},
2^{150}, and 2^{400}, respectively (see RandomStream
for their
definition). The seed of the RNG has two part: the linear part is a
19dimensional vector of 32bit integers, while the nonlinear part is
made up of a ndimensional vector of indices, representing the position
of the generator in each array of the nonlinear components.
Constructor Summary  

F2NL607()
Constructs a new stream, initializing it at its beginning. 

F2NL607(String name)
Constructs a new stream with the identifier name (used in the toString method). 
Method Summary  

F2NL607 
clone()
Clones the current generator and return its copy. 
int[] 
getLinearState()
Returns the current state of the linear part of the stream, represented as an array of 19 integers. 
static int[][] 
getNonLinearData()
Return the data of all the components of the nonlinear part of the random number generator. 
int[] 
getNonLinearState()
Returns the current state of the nonlinear part of the stream, represented as an array of n integers, where n is the number of components in the nonlinear generator. 
void 
resetNextSubstream()
Reinitializes the stream to the beginning of its next substream: N_{g} is computed, and C_{g} and B_{g} are set to N_{g}. 
void 
resetStartStream()
Reinitializes the stream to its initial state I_{g}: C_{g} and B_{g} are set to I_{g}. 
void 
resetStartSubstream()
Reinitializes the stream to the beginning of its current substream: C_{g} is set to B_{g}. 
void 
setLinearSeed(int[] seed)
This method is discouraged for normal use. 
static void 
setNonLinearData(int[][] data)
Selects new data for the components of the nonlinear generator. 
void 
setNonLinearSeed(int[] seed)
This method is discouraged for normal use. 
static void 
setPackageLinearSeed(int[] seed)
Sets the initial seed of the linear part of the class F2NL607 to the 19 integers of the vector seed[0..18]. 
static void 
setPackageNonLinearSeed(int[] seed)
Sets the nonlinear part of the initial seed of the class F2NL607 to the n integers of the vector seed[0..n1], where n is the number of components of the nonlinear part. 
static void 
setScrambleData(RandomStream rand,
int steps,
int[] size)
Selects new data for the components of the nonlinear generator. 
String 
toString()
Returns a string containing the current state of this stream. 
Methods inherited from class umontreal.iro.lecuyer.rng.RandomStreamBase 

formatState, formatStateFull, increasedPrecision, nextArrayOfDouble, nextArrayOfInt, nextDouble, nextInt 
Methods inherited from class java.lang.Object 

equals, getClass, hashCode, notify, notifyAll, wait, wait, wait 
Constructor Detail 

public F2NL607()
public F2NL607(String name)
name
 name of the streamMethod Detail 

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 static void setPackageLinearSeed(int[] seed)
seed
 array of 19 elements representing the seedpublic void setLinearSeed(int[] seed)
seed
 array of 19 elements representing the seedpublic int[] getLinearState()
public static void setPackageNonLinearSeed(int[] seed)
seed
 array of n elements representing the nonlinear seedpublic void setNonLinearSeed(int[] seed)
seed
 public int[] getNonLinearState()
public static int[][] getNonLinearData()
public static void setNonLinearData(int[][] data)
NOTE : This method cannot be called if at least one instance of
F2NL607 has been constructed. In that case, it will throw
an IllegalStateException
.
data
 the new data of the components
IllegalStateException
 if an instance of the class was
constructed beforepublic static void setScrambleData(RandomStream rand, int steps, int[] size)
NOTE : This method cannot be called if at least one instance of
F2NL607 has been constructed. In that case, it will throw
an IllegalStateException
.
rand
 the random numbers source to do the scramblingsteps
 number of time to do the scramblingsize
 size of each components
IllegalStateException
 if an instance of the class was
constructed beforepublic F2NL607 clone()
clone
in interface CloneableRandomStream
public String toString()
RandomStream
toString
in interface RandomStream
toString
in class RandomStreamBase

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