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SSJ V. 1.2.5. |
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java.lang.Objectumontreal.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 quasi-Monte 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: 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. |
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 RandomStreampublic void resetStartSubstream()
RandomStream
resetStartSubstream in interface RandomStreampublic void resetNextSubstream()
RandomStream
resetNextSubstream in interface RandomStreampublic String toString()
toString in interface RandomStreamtoString in class Objectpublic double nextDouble()
nextDouble in interface RandomStream
public int nextInt(int i,
int j)
nextDouble (in which the baker transformation is applied).
nextInt in interface RandomStreami - smallest integer that can be generatedj - greatest integer that can be generated
public void nextArrayOfDouble(double[] u,
int start,
int n)
nextArrayOfDouble in interface RandomStreamu - 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
public void nextArrayOfInt(int i,
int j,
int[] u,
int start,
int n)
nextArrayOfInt in interface RandomStreami - 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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SSJ V. 1.2.5. |
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