umontreal.iro.lecuyer.rng

## Class RandMrg

- java.lang.Object
- umontreal.iro.lecuyer.rng.RandMrg

- All Implemented Interfaces:
- Serializable, Cloneable, CloneableRandomStream, RandomStream

**Deprecated.**@Deprecatedpublic class RandMrgextends Objectimplements CloneableRandomStream, Serializable

- See Also:
- Serialized Form

### Constructor Summary

Constructors Constructor and Description **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`.**RandMrg**(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

Methods 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*B*_{g}and*I*_{g}associated with this stream.`RandMrg`

**clone**()**Deprecated.**Clones the current generator and return its copy.`double[]`

**getState**()**Deprecated.**Returns the current state*C*_{g}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:*N*_{g}is computed, and*C*_{g}and*B*_{g}are set to*N*_{g}.`void`

**resetStartStream**()**Deprecated.**Reinitializes the stream to its initial state*I*_{g}:*C*_{g}and*B*_{g}are set to*I*_{g}.`void`

**resetStartSubstream**()**Deprecated.**Reinitializes the stream to the beginning of its current substream:*C*_{g}is set to*B*_{g}.`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*I*_{g}of this stream to the vector`seed[0..5]`.`String`

**toString**()**Deprecated.**Returns a string containing the current state of this stream.`String`

**toStringFull**()**Deprecated.**Returns a string containing the name of this stream and the values of all its internal variables.

### 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(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*m*_{1}= 4294967087, and not all 0; and the last 3 values must all be less than*m*_{2}= 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 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`Object`

- Returns:
- the state of the generator formated as a string

#### toStringFull

public 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/(2^{32}- 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`Object`

- Returns:
- A deep copy of the current generator

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