NAME
Array::Sample::WeightedRandom::Scan - (DO NOT USE) Sample elements randomly, with weights, without replacement (using scan algorithm)
VERSION
This document describes version 0.005 of Array::Sample::WeightedRandom::Scan (from Perl distribution Array-Sample-WeightedRandom), released on 2022-05-22.
SYNOPSIS
use Array::Sample::WeightedRandom::Scan qw(sample_weighted_random_no_replacement);
# "b" will be picked more often because it has a greater weight. it's also more
# likely to be at the front of the samples.
sample_weighted_random_with_replacement([ ["a",1], ["b",2.5] ], 1); => ("b")
sample_weighted_random_with_replacement([ ["a",1], ["b",2.5] ], 1); => ("a")
sample_weighted_random_with_replacement([ ["a",1], ["b",2.5] ], 1); => ("b")
sample_weighted_random_no_replacement([ ["a",1], ["b",2.5] ], 5); => ("b", "a")
DESCRIPTION
DO NOT USE. This algorithm currently produces biased results where the items at the beginning will be picked at probabiity not quite according to their weights. Use Array::Sample::WeightedRandom instead.
This module provides "sample_weighted_random_no_replacement" which is the same as the one provided by Array::Sample::WeightedRandom but uses the scan algorithm. It actually scans the array twice instead of once.
FUNCTIONS
sample_weighted_random_no_replacement
See documentation of Array::Sample::WeightedRandom.
FAQ
Why no sample_weighted_random_with_replacement?
This kind of sampling does not require scanning algorithm.
HOMEPAGE
Please visit the project's homepage at https://metacpan.org/release/Array-Sample-WeightedRandom.
SOURCE
Source repository is at https://github.com/perlancar/perl-Array-Sample-WeightedRandom.
SEE ALSO
Other sampling methods: Array::Sample::Partition, Array::Sample::SysRand, Array::Sample::SimpleRandom.
AUTHOR
perlancar <perlancar@cpan.org>
CONTRIBUTING
To contribute, you can send patches by email/via RT, or send pull requests on GitHub.
Most of the time, you don't need to build the distribution yourself. You can simply modify the code, then test via:
% prove -l
If you want to build the distribution (e.g. to try to install it locally on your system), you can install Dist::Zilla, Dist::Zilla::PluginBundle::Author::PERLANCAR, and sometimes one or two other Dist::Zilla plugin and/or Pod::Weaver::Plugin. Any additional steps required beyond that are considered a bug and can be reported to me.
COPYRIGHT AND LICENSE
This software is copyright (c) 2022 by perlancar <perlancar@cpan.org>.
This is free software; you can redistribute it and/or modify it under the same terms as the Perl 5 programming language system itself.
BUGS
Please report any bugs or feature requests on the bugtracker website https://rt.cpan.org/Public/Dist/Display.html?Name=Array-Sample-WeightedRandom
When submitting a bug or request, please include a test-file or a patch to an existing test-file that illustrates the bug or desired feature.