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java.lang.Object umontreal.iro.lecuyer.rng.BakerTransformedStream
public class BakerTransformedStream
This container class permits one to apply the baker's transformation to
the output of any RandomStream
.
It transforms each
u∈[0, 1] into 2u if u <= 1/2 and 2(1  u)
if u > 1/2.
The nextDouble
method will return the result of this transformation
and the other next... methods are affected accordingly.
Any instance of this class contains a RandomStream
called its
base stream, used to generate its numbers and to which the
transformation is applied.
Any call to one of the next...
methods of this class will modify the state of the base stream.
The baker transformation is often applied when the RandomStream
is actually an iterator over a point set used for quasiMonte Carlo
integration (see the hups package).
Constructor Summary  

BakerTransformedStream(RandomStream stream)
Constructs a new baker transformed stream, using the random numbers from the base stream stream. 
Method Summary  

void 
nextArrayOfDouble(double[] u,
int start,
int n)
Calls nextArrayOfDouble (u, start, n) for the base stream, then applies the baker transformation. 
void 
nextArrayOfInt(int i,
int j,
int[] u,
int start,
int n)
Fills up the array by calling nextInt (i, j). 
double 
nextDouble()
Returns the baker transformation of s.nextDouble() where s is the base stream. 
int 
nextInt(int i,
int j)
Generates a random integer in {i,..., j} via nextDouble (in which the baker transformation is applied). 
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}. 
String 
toString()
Returns a string starting with "Baker transformation of " and finishing with the result of the call to the toString method of the generator. 
Methods inherited from class java.lang.Object 

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

public BakerTransformedStream(RandomStream stream)
Method Detail 

public void resetStartStream()
RandomStream
resetStartStream
in interface RandomStream
public void resetStartSubstream()
RandomStream
resetStartSubstream
in interface RandomStream
public void resetNextSubstream()
RandomStream
resetNextSubstream
in interface RandomStream
public String toString()
toString
in interface RandomStream
toString
in class Object
public double nextDouble()
nextDouble
in interface RandomStream
public int nextInt(int i, int j)
nextDouble
(in which the baker transformation is applied).
nextInt
in interface RandomStream
i
 smallest integer that can be generatedj
 greatest integer that can be generated
public void nextArrayOfDouble(double[] u, int start, int n)
nextArrayOfDouble
in interface RandomStream
u
 the array in which the numbers will be storedstart
 the first index of u to be usedn
 the number of random numbers to put in upublic void nextArrayOfInt(int i, int j, int[] u, int start, int n)
nextArrayOfInt
in interface RandomStream
i
 the smallest possible integer to put in uj
 the largest possible integer to put in uu
 the array in which the numbers will be storedstart
 the first index of u to be usedn
 the number of random numbers to put in u

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