NAME

Lingua::JA::DocumentFrequency::AozoraBunko - Return the document frequency in Aozora Bunko

SYNOPSIS

  use Lingua::JA::DocumentFrequency::AozoraBunko;
  use utf8;

  aozora_df('本');         # => 5180
  aozora_df('遊蕩');       # => 160
  aozora_df('チャカポコ'); # => 3
  aozora_df('しおらしい'); # => 149
  aozora_df('イチロー');   # => 0

  Lingua::JA::DocumentFrequency::AozoraBunko::df('ジャピイ'); # => 2
  Lingua::JA::DocumentFrequency::AozoraBunko::df('カア');     # => 23

  my $N = Lingua::JA::DocumentFrequency::AozoraBunko::number_of_documents(); # => 11176
  idf('ジャピイ'); # => 8.62837672037685
  idf('カア');     # => 6.18602968500765

  sub idf { log( $N / aozora_df(shift) ) }

DESCRIPTION

Lingua::JA::DocumentFrequency::AozoraBunko returns the document frequency in Aozora Bunko.

METHODS

df($word)

Returns the document frequency of $word.

aozora_df($word)

Same as df method, but this method is exported by default.

number_of_documents

Returns the number of the documents in Aozora Bunko.

LICENSE

Copyright (C) pawa.

This library is free software; you can redistribute it and/or modify it under the same terms as Perl itself.

AUTHOR

pawa <pawapawa@cpan.org>