Module: Raingrams::Helpers::Frequency

Included in:
Model
Defined in:
lib/raingrams/helpers/frequency.rb

Instance Method Summary collapse

Instance Method Details

#frequencies_for(ngrams) ⇒ Object

Returns the observed frequency of the specified ngrams occurring within the training text.



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# File 'lib/raingrams/helpers/frequency.rb', line 22

def frequencies_for(ngrams)
  table = {}

  ngrams.each do |ngram|
    table[ngram] = frequency_of_ngram(ngram)
  end

  return table
end

#frequency_of_ngram(ngram) ⇒ Object

Returns the observed frequency of the specified ngram within the training text.



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# File 'lib/raingrams/helpers/frequency.rb', line 8

def frequency_of_ngram(ngram)
  prefix = ngram.prefix

  if @prefixes.has_key?(prefix)
    return @prefixes[prefix].frequency_of(ngram.last)
  else
    return 0
  end
end

#frequency_of_ngrams(ngrams) ⇒ Object

Returns the total observed frequency of the specified ngrams occurring within the training text.



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# File 'lib/raingrams/helpers/frequency.rb', line 36

def frequency_of_ngrams(ngrams)
  frequencies_for(ngrams).values.inject do |total,freq|
    total + freq
  end
end