base64.tokyo > Algorithm-EquivalenceSets > Algorithm::EquivalenceSets
Module Version: 1.101420

NAME

Algorithm::EquivalenceSets - Group sets transitively

version 1.101420

SYNOPSIS

```    use Algorithm::EquivalenceSets;

my @sets = (
[ 'a', 1, 2 ],
[ 'b', 3, 4 ],
[ 'c', 5    ],
[ 'd', 1, 6 ],
[ 'e', 3, 6 ],
[ 'f', 5, 7 ],
);

my @equiv_sets = equivalence_sets(@sets);

# @equiv_sets is ([ qw(c f 5 7) ], [ qw(a b d e 1 2 3 4 6) ])```

DESCRIPTION

This module exports one function, `equivalence_sets()`, which takes a list of sets and returns another list of sets whose contents are transitively grouped from the input sets.

Imagine the input sets to be `[ 1, 2 ]`, `[ 3, 4 ]`, `[ 5, 6 ]` and `[ 1, 3, 7 ]`. The returned sets would be `[ 1, 2, 3, 4, 7 ]` and `[ 5, 6 ]`, because `[ 1, 2 ]` and `[ 3, 4 ]` are tied together by `[ 1, 3, 7 ]`, but `[ 5, 6 ]` stands on its own. So you could say the returned sets represent a kind of transitive union. (Real mathematicians may now flame me about the misuse of terminology.)

Each set is an array reference. The return sets are given as an array in list context, or as a reference to that array in scalar context.

FIXME

INSTALLATION

See perlmodinstall for information and options on installing Perl modules.

BUGS AND LIMITATIONS

No bugs have been reported.

Please report any bugs or feature requests through the web interface at http://rt.cpan.org/Public/Dist/Display.html?Name=Algorithm-EquivalenceSets.

AVAILABILITY

The latest version of this module is available from the Comprehensive Perl Archive Network (CPAN). Visit http://www.perl.com/CPAN/ to find a CPAN site near you, or see http://search.cpan.org/dist/Algorithm-EquivalenceSets/.

The development version lives at http://github.com/hanekomu/Algorithm-EquivalenceSets/. Instead of sending patches, please fork this project using the standard git and github infrastructure.

AUTHOR

`  Marcel Gruenauer <marcel@cpan.org>`