NAME
    Array::Sample::SysRand - Systematic random sampling from an array

VERSION
    This document describes version 0.003 of Array::Sample::SysRand (from
    Perl distribution Array-Sample-SysRand), released on 2022-05-20.

SYNOPSIS
     use Array::Sample::SysRand qw(sample_sysrand);

     sample_sysrand([0,1,2,3,4,5,6,7,8,9], 5); => (5, 7, 9, 1, 3)
     sample_sysrand([0,1,2,3,4,5,6,7,8,9], 5); => (2, 4, 6, 8, 0)

     sample_sysrand([0,1,2,3,4,5,6,7,8,9], 3); => (2, 6, 9)
     sample_sysrand([0,1,2,3,4,5,6,7,8,9], 3); => (4, 8, 1)

DESCRIPTION
FUNCTIONS
    All functions are not exported by default, but exportable.

  sample_sysrand
    Syntax: sample_sysrand(\@ary, $n [ , \%opts ]) => list

    Options:

    *   pos => bool

        If set to true, will return positions instead of the elements.

    The function takes an array reference ("\@ary") and the number of
    samples requested ($n) and will return a list of samples. It will start
    from a random position to get the first sample then jump at fixed
    interval to get the subsequent ones.

HOMEPAGE
    Please visit the project's homepage at
    <https://metacpan.org/release/Array-Sample-SysRand>.

SOURCE
    Source repository is at
    <https://github.com/perlancar/perl-Array-Sample-SysRand>.

SEE ALSO
    About systematic (random) sampling:
    <https://www.investopedia.com/terms/s/systematic-sampling.asp>

    Other sampling methods: Array::Sample::Partition,
    Array::Sample::SimpleRandom, Array::Sample::WeightedRandom

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-SysRand>

    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.