Class: RandomMT19937

• Inheritance
• Description
• Related information
• Class protocol
  • instance creation
• Instance protocol
  • initialization
  • random numbers

Inheritance:

   Object
   |
   +--RandomMT19937

Package:

stx:libbasic2

Category:

Magnitude-Numbers-Random

Version:

rev: 1.10 date: 2018/03/02 13:04:23

user: cg

file: RandomMT19937.st directory: libbasic2

module: stx stc-classLibrary: libbasic2

Author:

Original algorithm by Takuji Nishimura and Makoto Matsumoto

Ported to Smalltalk by Claus Gittinger.

Description:

Warning: this generator should not be used for cryptographic work.

NO WARRANTY

A Mersenne Twister based on code by Takuji Nishimura and Makoto Matsumoto.

Before using, initialize the state by using initGen(seed) or initByArray(init_key).

RandomMT19937 new nextInteger
(RandomMT19937 new:5489) nextInteger
(RandomMT19937 newByArray:{16r123 . 16r234 .16r345 . 16r456}) nextInteger

If heavily used, it may be useful to embed the original C code as inline C code for a big speedup)

Please read:
    Wikipedia article on Mersenne Twister end esp. MT19937
    http://de.wikipedia.org/wiki/Liste_von_Zufallszahlengeneratoren
    MT home page http://www.math.sci.hiroshima-u.ac.jp/~m-mat/MT/emt.html

Related information:

    http://www0.cs.ucl.ac.uk/staff/d.jones/GoodPracticeRNG.pdf
    RandomGenerator
    -
    the
    default;
    uses
    the
    machine's
    /dev/random
    if
    available
    Random
    -
    fast,
    but
    generates
    less
    quality
    random
    numbers
    RandomTT800
    -
    another
    random
    generator
    RandomParkMiller
    -
    another
    random
    generator

Class protocol:

 new

 new: seed

 newByArray: keyArray

Instance protocol:

 initByArray: keyArray

MSB is 1; assuring non-zero initial array

 initGenRand: seedUsed

self new nextInteger

 initialize

constant vector a

usage example(s):

mti==N+1 means mt[N] is not initialized */

 nextBoolean

generates a boolean random

 nextInteger

generates the next integer in 0..FFFFFFFF