Class: Histogram

Inherits:
Object show all
Defined in:
lib/histogram.rb

Defined Under Namespace

Classes: EquivalenceClass

Instance Method Summary collapse

Constructor Details

#initialize(enum = nil) ⇒ Histogram

Here the enumearation is something which respond to each.



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# File 'lib/histogram.rb', line 49

def initialize ( enum=nil )
  @hist = []
  enum.each { |x| self << x } unless enum.nil?
end

Instance Method Details

#<<(anObject) ⇒ Object 



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# File 'lib/histogram.rb', line 88

def << ( anObject )
  anEquivalenceClass = equivalence_class_of anObject
  if anEquivalenceClass.nil?
    @hist << EquivalenceClass.new(@hist.size, anObject)
  else
    anEquivalenceClass << anObject
  end
  self
end

#[](anObject) ⇒ Object 



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# File 'lib/histogram.rb', line 99

def [] ( anObject )
  anEquivalenceClass = equivalence_class_of(anObject)
  (anEquivalenceClass)? anEquivalenceClass.size : 0
end

#each(&block) ⇒ Object 



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# File 'lib/histogram.rb', line 105

def each ( &block )
  @hist.each(&block)
end

#equivalence_class_by_index(anInteger) ⇒ Object 



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# File 'lib/histogram.rb', line 83

def equivalence_class_by_index ( anInteger )
  @hist[anInteger]
end

#equivalence_class_of(anObject) ⇒ Object 



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# File 'lib/histogram.rb', line 75

def equivalence_class_of ( anObject )
  @hist.each do |anEquivalenceClass|
    return anEquivalenceClass if anEquivalenceClass.include? anObject
  end
  return nil
end

#frequences ⇒ Object

Returns apparation frequences as an array which is the @support@ divided by the amount of samples.



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# File 'lib/histogram.rb', line 63

def frequences
  sup = support
  total = sup.sum
  sup.map { |x| x.to_f / total }
end

#size ⇒ Object 



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# File 'lib/histogram.rb', line 110

def size
  @hist.size
end

#support ⇒ Object

Returns an array with size of each equivalence class.



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# File 'lib/histogram.rb', line 56

def support
  @hist.map { |equivalence_class| equivalence_class.size }
end

#to_a ⇒ Object 



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# File 'lib/histogram.rb', line 115

def to_a
  @hist.dup
end

#total ⇒ Object 



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# File 'lib/histogram.rb', line 70

def total
  support.sum
end