umontreal.iro.lecuyer.rng

Class RandMrg

java.lang.Object

umontreal.iro.lecuyer.rng.RandMrg

All Implemented Interfaces:

java.io.Serializable, java.lang.Cloneable, CloneableRandomStream, RandomStream

Deprecated.

@Deprecated
public class RandMrg
extends java.lang.Object
implements CloneableRandomStream, java.io.Serializable

See Also:

Serialized Form

Constructor Summary

Constructors

Constructor and Description
RandMrg() Deprecated. Constructs a new stream, initializes its seed Ig, sets Bg and Cg equal to Ig, and sets its antithetic switch to false.
RandMrg(java.lang.String name) Deprecated. Constructs a new stream with an identifier name (can be used when printing the stream state, in error messages, etc.).

Method Summary

Modifier and Type	Method and Description
void	advanceState(int e, int c) Deprecated. Advances the state of this stream by k values, without modifying the states of other streams (as in setSeed), nor the values of Bg and Ig associated with this stream.
RandMrg	clone() Deprecated. Clones the current generator and return its copy.
double[]	getState() Deprecated. Returns the current state Cg of this stream.
void	increasedPrecis(boolean incp) Deprecated. After calling this method with incp = true, each call to the generator (direct or indirect) for this stream will return a uniform random number with (roughly) 53 bits of resolution instead of 32 bits, and will advance the state of the stream by 2 steps instead of 1.
void	nextArrayOfDouble(double[] u, int start, int n) Deprecated. Generates n (pseudo)random numbers from the uniform distribution and stores them into the array u starting at index start.
void	nextArrayOfInt(int i, int j, int[] u, int start, int n) Deprecated. Generates n (pseudo)random numbers from the discrete uniform distribution over the integers {i, i + 1,..., j}, using this stream and stores the result in the array u starting at index start.
double	nextDouble() Deprecated. Returns a (pseudo)random number from the uniform distribution over the interval (0, 1), using this stream, after advancing its state by one step.
int	nextInt(int i, int j) Deprecated. Returns a (pseudo)random number from the discrete uniform distribution over the integers {i, i + 1,..., j}, using this stream.
void	resetNextSubstream() Deprecated. Reinitializes the stream to the beginning of its next substream: Ng is computed, and Cg and Bg are set to Ng.
void	resetStartStream() Deprecated. Reinitializes the stream to its initial state Ig: Cg and Bg are set to Ig.
void	resetStartSubstream() Deprecated. Reinitializes the stream to the beginning of its current substream: Cg is set to Bg.
void	setAntithetic(boolean anti) Deprecated.
static void	setPackageSeed(long[] seed) Deprecated. Sets the initial seed for the class RandMrg to the six integers in the vector seed[0..5].
void	setSeed(long[] seed) Deprecated. Sets the initial seed Ig of this stream to the vector seed[0..5].
java.lang.String	toString() Deprecated. Returns a string containing the current state of this stream.
java.lang.String	toStringFull() Deprecated. Returns a string containing the name of this stream and the values of all its internal variables.

Methods inherited from class java.lang.Object

equals, getClass, hashCode, notify, notifyAll, wait, wait, wait

Constructor Detail

RandMrg

public RandMrg()

Deprecated.

Constructs a new stream, initializes its seed I_g, sets B_g and C_g equal to I_g, and sets its antithetic switch to false. The seed I_g is equal to the initial seed of the package given by setPackageSeed if this is the first stream created, otherwise it is Z steps ahead of that of the stream most recently created in this class.

RandMrg

public RandMrg(java.lang.String name)

Deprecated.

Constructs a new stream with an identifier name (can be used when printing the stream state, in error messages, etc.).

Parameters:

name - name of the stream

Method Detail

setPackageSeed

public static void setPackageSeed(long[] seed)

Deprecated.

Sets the initial seed for the class RandMrg to the six integers in the vector seed[0..5]. This will be the seed (initial state) of the first stream. If this method is not called, the default initial seed is (12345, 12345, 12345, 12345, 12345, 12345). If it is called, the first 3 values of the seed must all be less than m₁ = 4294967087, and not all 0; and the last 3 values must all be less than m₂ = 4294944443, and not all 0.

Parameters:

seed - array of 6 elements representing the seed

resetStartStream

public void resetStartStream()

Deprecated.

Description copied from interface: RandomStream

Reinitializes the stream to its initial state I_g: C_g and B_g are set to I_g.

Specified by:

resetStartStream in interface RandomStream

resetStartSubstream

public void resetStartSubstream()

Deprecated.

Description copied from interface: RandomStream

Reinitializes the stream to the beginning of its current substream: C_g is set to B_g.

Specified by:

resetStartSubstream in interface RandomStream

resetNextSubstream

public void resetNextSubstream()

Deprecated.

Description copied from interface: RandomStream

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.

Specified by:

resetNextSubstream in interface RandomStream

increasedPrecis

public void increasedPrecis(boolean incp)

Deprecated.

After calling this method with incp = true, each call to the generator (direct or indirect) for this stream will return a uniform random number with (roughly) 53 bits of resolution instead of 32 bits, and will advance the state of the stream by 2 steps instead of 1. More precisely, if s is a stream of the class RandMrg, in the non-antithetic case, the instruction ``u = s.nextDouble()'', when the resolution has been increased, is equivalent to ``u = (s.nextDouble() + s.nextDouble()*fact) % 1.0'' where the constant fact is equal to 2^-24. This also applies when calling nextDouble indirectly (e.g., via nextInt, etc.).

By default, or if this method is called again with incp = false, each call to nextDouble for this stream advances the state by 1 step and returns a number with 32 bits of resolution.

Parameters:

incp - true if increased precision is desired, false otherwise

setAntithetic

public void setAntithetic(boolean anti)

Deprecated.

advanceState

public void advanceState(int e,
                         int c)

Deprecated.

Advances the state of this stream by k values, without modifying the states of other streams (as in setSeed), nor the values of B_g and I_g associated with this stream. If e > 0, then k = 2^e + c; if e < 0, then k = - 2^-e + c; and if e = 0, then k = c. Note: c is allowed to take negative values. This method should be used only in very exceptional cases; proper use of the reset... methods and of the stream constructor cover most reasonable situations.

Parameters:

e - an exponent

c - a constant

setSeed

public void setSeed(long[] seed)

Deprecated.

Sets the initial seed I_g of this stream to the vector seed[0..5]. This vector must satisfy the same conditions as in setPackageSeed. The stream is then reset to this initial seed. The states and seeds of the other streams are not modified. As a result, after calling this method, the initial seeds of the streams are no longer spaced Z values apart. For this reason, this method should be used only in very exceptional situations; proper use of reset... and of the stream constructor is preferable.

Parameters:

seed - array of 6 integers representing the new seed

getState

public double[] getState()

Deprecated.

Returns the current state C_g of this stream. This is a vector of 6 integers represented in floating-point format. This method is convenient if we want to save the state for subsequent use.

Returns:

the current state of the generator

toString

public java.lang.String toString()

Deprecated.

Description copied from interface: RandomStream

Returns a string containing the current state of this stream.

Specified by:

toString in interface RandomStream

Overrides:

toString in class java.lang.Object

Returns:

the state of the generator formated as a string

toStringFull

public java.lang.String toStringFull()

Deprecated.

Returns a string containing the name of this stream and the values of all its internal variables.

Returns:

the detailed state of the generator, formatted as a string

nextDouble

public double nextDouble()

Deprecated.

Returns a (pseudo)random number from the uniform distribution over the interval (0, 1), using this stream, after advancing its state by one step. Normally, the returned number has 32 bits of resolution, in the sense that it is always a multiple of 1/(2³² - 208). However, if the precision has been increased by calling increasedPrecis for this stream, the resolution is higher and the stream state advances by two steps.

Specified by:

nextDouble in interface RandomStream

Returns:

the next generated uniform

nextArrayOfDouble

public void nextArrayOfDouble(double[] u,
                              int start,
                              int n)

Deprecated.

Description copied from interface: RandomStream

Generates n (pseudo)random numbers from the uniform distribution and stores them into the array u starting at index start.

Specified by:

nextArrayOfDouble in interface RandomStream

Parameters:

u - array that will contain the generated uniforms

start - starting index, in the array u, to write uniforms from

n - number of uniforms to generate

nextInt

public int nextInt(int i,
                   int j)

Deprecated.

Description copied from interface: RandomStream

Returns a (pseudo)random number from the discrete uniform distribution over the integers {i, i + 1,..., j}, using this stream. (Calls nextDouble once.)

Specified by:

nextInt in interface RandomStream

Parameters:

i - smallest integer that can be generated

j - greatest integer that can be generated

Returns:

the generated integer

nextArrayOfInt

public void nextArrayOfInt(int i,
                           int j,
                           int[] u,
                           int start,
                           int n)

Deprecated.

Description copied from interface: RandomStream

Generates n (pseudo)random numbers from the discrete uniform distribution over the integers {i, i + 1,..., j}, using this stream and stores the result in the array u starting at index start. (Calls nextInt n times.)

Specified by:

nextArrayOfInt in interface RandomStream

Parameters:

i - smallest integer that can be generated

j - greatest integer that can be generated

u - array that will contain the generated values

start - starting index, in the array u, to write integers from

n - number of values being generated

clone

public RandMrg clone()

Deprecated.

Clones the current generator and return its copy.

Specified by:

clone in interface CloneableRandomStream

Overrides:

clone in class java.lang.Object

Returns:

A deep copy of the current generator