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libmath-random-mt-perl - Perl implementation of the Mersenne Twister algorithm…  more info»

Math::Random::MT.3pm.gz

MT(3pm)          User Contributed Perl Documentation         MT(3pm)



NAME
       Math::Random::MT - The Mersenne Twister PRNG

SYNOPSIS
         ## Object-oriented interface:
         use Math::Random::MT;
         $gen = Math::Random::MT->new()        # or...
         $gen = Math::Random::MT->new($seed);  # or...
         $gen = Math::Random::MT->new(@seeds);
         $seed = $gen->get_seed();             # seed used to generate the random numbers
         $rand = $gen->rand(42);               # random number in the interval [0, 42)
         $dice = int($gen->rand(6)+1);         # random integer between 1 and 6
         $coin = $gen->rand() < 0.5 ?          # flip a coin
           "heads" : "tails"
         $int = $gen->irand();                 # random integer in [0, 2^32-1]

         ## Function-oriented interface:
         use Math::Random::MT qw(srand rand irand);
         # now use srand() and rand() as you usually do in Perl

DESCRIPTION
       The Mersenne Twister is a pseudorandom number generator
       developed by Makoto Matsumoto and Takuji Nishimura. It is
       described in their paper at
       <URL:http://www.math.keio.ac.jp/~nisimura/random/doc/mt.ps>.
       This algorithm has a very uniform distribution and is good
       for modelling purposes but do not use it for cryptography.

       This module implements two interfaces:

   Object-oriented interface
       new()
           Creates a new generator that is automatically seeded
           based on gettimeofday.

       new($seed)
           Creates a new generator seeded with an unsigned 32-bit
           integer.

       new(@seeds)
           Creates a new generator seeded with an array of (up to
           624) unsigned 32-bit integers.

       set_seed()
           Seeds the generator. It takes the same arguments as
           new().

       get_seed()
           Retrieves the value of the seed used.

       rand($num)
           Behaves exactly like Perl's builtin rand(), returning a
           number uniformly distributed in [0, $num) ($num defaults
           to 1).

       irand()
           Returns a 32-bit integer, i.e. an integer uniformly
           distributed in [0, 2^32-1].

   Function-oriented interface
       srand($seed)
           Behaves just like Perl's builtin srand(). As in Perl >=
           5.14, the seed is returned. If you use this interface, it
           is strongly recommended that you call srand() explicitly,
           rather than relying on rand() to call it the first time
           it is used.

       rand($num)
           Behaves exactly like Perl's builtin rand(), returning a
           number uniformly distributed in [0, $num) ($num defaults
           to 1).

       irand()
           Returns a 32-bit integer, i.e. an integer uniformly
           distributed in [0, 2^32-1].

SEE ALSO
       <URL:http://www.math.sci.hiroshima-u.ac.jp/~m-mat/MT/emt.html>

       Data::Entropy

ACKNOWLEDGEMENTS
       Sean M. Burke
           For giving me the idea to write this module.

       Philip Newton
           For several useful patches.

       Florent Angly
           For implementing seed generation and retrieval.

AUTHOR
       Abhijit Menon-Sen <ams@toroid.org>

       Copyright 2001 Abhijit Menon-Sen. All rights reserved.

       Based on the C implementation of MT19937 Copyright (C) 1997 -
       2002, Makoto Matsumoto and Takuji Nishimura

       This software is distributed under a (three-clause) BSD-style
       license.  See the LICENSE file in the distribution for
       details.



perl v5.14.2                 2012-08-07                      MT(3pm)
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