Module: Enumerable

Included in:
TextBoxParser
Defined in:
lib/enumerable_extenders.rb

Instance Method Summary collapse

Instance Method Details

#arraysum ⇒ Object

sum of an array of numbers



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# File 'lib/enumerable_extenders.rb', line 7

def arraysum
  return self.inject(0){|acc,i|acc +i}
end

#average ⇒ Object

average of an array of numbers



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# File 'lib/enumerable_extenders.rb', line 12

def average
  return self.sum/self.length.to_f
end

#dups ⇒ Object 



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# File 'lib/enumerable_extenders.rb', line 2

def dups
  inject({}) {|h,v| h[v]=h[v].to_i+1; h}.reject{|k,v| v==1}.keys
end

#sample_variance ⇒ Object

variance of an array of numbers



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# File 'lib/enumerable_extenders.rb', line 17

def sample_variance
  avg=self.average
  sum=self.inject(0){|acc,i|acc +(i-avg)**2}
  return(1/self.length.to_f*sum)
end

#standard_deviation ⇒ Object

standard deviation of an array of numbers



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# File 'lib/enumerable_extenders.rb', line 24

def standard_deviation
  return Math.sqrt(self.sample_variance)
end