RandMrg
umontreal.iro.lecuyer.rng

Class RandMrg

    • 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(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 TypeMethod and Description
      voidadvanceState(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.
      RandMrgclone()
      Deprecated. 
      Clones the current generator and return its copy.
      double[]getState()
      Deprecated. 
      Returns the current state Cg of this stream.
      voidincreasedPrecis(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.
      voidnextArrayOfDouble(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.
      voidnextArrayOfInt(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.
      doublenextDouble()
      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.
      intnextInt(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.
      voidresetNextSubstream()
      Deprecated. 
      Reinitializes the stream to the beginning of its next substream: Ng is computed, and Cg and Bg are set to Ng.
      voidresetStartStream()
      Deprecated. 
      Reinitializes the stream to its initial state Ig: Cg and Bg are set to Ig.
      voidresetStartSubstream()
      Deprecated. 
      Reinitializes the stream to the beginning of its current substream: Cg is set to Bg.
      voidsetAntithetic(boolean anti)
      Deprecated. 
       
      static voidsetPackageSeed(long[] seed)
      Deprecated. 
      Sets the initial seed for the class RandMrg to the six integers in the vector seed[0..5].
      voidsetSeed(long[] seed)
      Deprecated. 
      Sets the initial seed Ig of this stream to the vector seed[0..5].
      StringtoString()
      Deprecated. 
      Returns a string containing the current state of this stream.
      StringtoStringFull()
      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 Ig, sets Bg and Cg equal to Ig, and sets its antithetic switch to false. The seed Ig 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 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 Ig: Cg and Bg are set to Ig.
        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: Cg is set to Bg.
        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: Ng is computed, and Cg and Bg are set to Ng.
        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 Bg and Ig associated with this stream. If e > 0, then k = 2e + 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 Ig 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 Cg 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/(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 Object
        Returns:
        A deep copy of the current generator

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