| Math::GSL::RNG(3pm) | User Contributed Perl Documentation | Math::GSL::RNG(3pm) |
Math::GSL::RNG - Random Number Generators
use Math::GSL::RNG;
my $rng = Math::GSL::RNG->new;
my @random = $rng->get(100);
my $rng = Math::GSL::RNG->new;
my $rng = Math::GSL::RNG->new($gsl_rng_knuthran,5);
Creates a new RNG object of type $type, seeded with $seed. Both of these parameters are optional. The type $gsl_rng_default is used when no $type is given.
my $copy = $rng->copy;
Make a copy of a RNG object.
$rng->free();
Free memory associated with RNG object.
my $name = $rng->name();
Get the name of the RNG object as a string.
my $nextval = $rng->get;
my (@values) = $rng->get(100);
Get the next random value from the RNG object. If given an integer N, returns the next N values.
my $raw = $rng->raw();
Return the raw GSL RNG object, useful for functions which take a RNG, such as the Monte Carlo integration functions or the random number distribution functions in Math::GSL::Randist.
my @array = $rng->shuffle(@other_array);
Given a RNG, shuffle an array.
my @array = $rng->choose(4, @other_array);
This function fills the destination array with k objects taken randomly from the n elements of the array argument. The objects are sampled without replacement, thus each object can only appear once in destination array. It is required that k be less than or equal to n.
my @array = $rng->sample(4, @other_array);
This method is like "choose" but samples k items from the original array of n items src with replacement, so the same object can appear more than once in the output sequence dest. There is no requirement that k be less than n in this case.
The original source code is available from NETLIB. For more information see, * W. Petersen, XLagged Fibonacci Random Number Generators for the NEC SX-3X, International Journal of High Speed Computing (1994).
For more information on the functions, we refer you to the GSL official documentation:
<http://www.gnu.org/software/gsl/manual/html_node/>
The following example will print out a list a random integers between certain minimum and maximum values. The command line arguments are first the number of random numbers wanted, the minimum and then maximum. The defaults are 10, 0 and 100, respectively.
use Math::GSL::RNG qw/:all/;
my $seed = int rand(100);
my $rng = Math::GSL::RNG->new($gsl_rng_knuthran, $seed );
my ($num,$min,$max) = @ARGV;
$num ||= 10;
$min ||= 0;
$max ||= 100;
print join "\n", map { $min + $rng->get % ($max-$min+1) } (1..$num);
print "\n";
The $seed argument is optional but encouraged. This program is available in the examples/ directory that comes with the source of this module.
If you would like a series of random non-integer numbers, then you can generate one "scaling factor" and multiple by that, such as
use Math::GSL::RNG qw/:all/;
my $scale= rand(10);
my $seed = int rand(100);
my $rng = Math::GSL::RNG->new($gsl_rng_knuthran, $seed );
my ($num,$min,$max) = (10,0,100);
print join "\n", map { $scale*($min + $rng->get % ($max-$min+1)) } (1..$num);
print "\n";
Jonathan "Duke" Leto <jonathan@leto.net> and Thierry Moisan <thierry.moisan@gmail.com>
Copyright (C) 2008-2021 Jonathan "Duke" Leto and Thierry Moisan
This program is free software; you can redistribute it and/or modify it under the same terms as Perl itself.
| 2022-10-20 | perl v5.36.0 |