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package Shannon::Entropy; |
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use 5.006; |
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use strict; |
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use warnings; |
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use Import::Export; |
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use base qw/Import::Export/; |
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our $VERSION = '1.101010'; |
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our %EX = ( |
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entropy => [qw/all/] |
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); |
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sub entropy { |
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my ($entropy, $len, $p, %t) = (0, length($_[0])); |
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return (map { $p = $_/$len; $entropy -= $p * log $p } (map { $t{$_}++ } split '', $_[0]) ? values %t : () and $entropy / log 2); |
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} |
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=head1 NAME |
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Shannon::Entropy - Calculate the Shannon entropy H of a given input string. |
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=head1 VERSION |
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Version 1.101010 |
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=cut |
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=head1 SYNOPSIS |
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Calculate the Shannon entropy H of a given input string. |
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use Shannon::Entropy qw/entropy/; |
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entropy('1223334444'); # 1.8464393446710154 |
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entropy('0123456789abcdef'); # 4 |
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=head2 entropy |
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=head1 AUTHOR |
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Robert Acock, C<< >> |
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=head1 BUGS |
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Please report any bugs or feature requests to C, or through |
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the web interface at L. I will be notified, and then you'll |
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automatically be notified of progress on your bug as I make changes. |
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=head1 SUPPORT |
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You can find documentation for this module with the perldoc command. |
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perldoc Shannon::Entropy |
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You can also look for information at: |
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=over 4 |
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=item * RT: CPAN's request tracker (report bugs here) |
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L |
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=item * AnnoCPAN: Annotated CPAN documentation |
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=item * CPAN Ratings |
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=item * Search CPAN |
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=back |
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=head1 ACKNOWLEDGEMENTS |
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=head1 LICENSE AND COPYRIGHT |
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Copyright 2018 Robert Acock. |
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This program is free software; you can redistribute it and/or modify it |
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under the terms of the the Artistic License (2.0). You may obtain a |
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copy of the full license at: |
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Any use, modification, and distribution of the Standard or Modified |
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Versions is governed by this Artistic License. By using, modifying or |
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distributing the Package, you accept this license. Do not use, modify, |
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or distribute the Package, if you do not accept this license. |
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If your Modified Version has been derived from a Modified Version made |
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by someone other than you, you are nevertheless required to ensure that |
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your Modified Version complies with the requirements of this license. |
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This license does not grant you the right to use any trademark, service |
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mark, tradename, or logo of the Copyright Holder. |
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This license includes the non-exclusive, worldwide, free-of-charge |
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patent license to make, have made, use, offer to sell, sell, import and |
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otherwise transfer the Package with respect to any patent claims |
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licensable by the Copyright Holder that are necessarily infringed by the |
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Package. If you institute patent litigation (including a cross-claim or |
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counterclaim) against any party alleging that the Package constitutes |
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direct or contributory patent infringement, then this Artistic License |
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to you shall terminate on the date that such litigation is filed. |
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Disclaimer of Warranty: THE PACKAGE IS PROVIDED BY THE COPYRIGHT HOLDER |
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AND CONTRIBUTORS "AS IS' AND WITHOUT ANY EXPRESS OR IMPLIED WARRANTIES. |
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THE IMPLIED WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR |
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PURPOSE, OR NON-INFRINGEMENT ARE DISCLAIMED TO THE EXTENT PERMITTED BY |
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YOUR LOCAL LAW. UNLESS REQUIRED BY LAW, NO COPYRIGHT HOLDER OR |
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CONTRIBUTOR WILL BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, OR |
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CONSEQUENTIAL DAMAGES ARISING IN ANY WAY OUT OF THE USE OF THE PACKAGE, |
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EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
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=cut |
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1; # End of Shannon::Entropy |