Module: Enumerable
- Included in:
- TextBoxParser
- Defined in:
- lib/enumerable_extenders.rb
Instance Method Summary collapse
-
#arraysum ⇒ Object
sum of an array of numbers.
-
#average ⇒ Object
average of an array of numbers.
- #dups ⇒ Object
-
#sample_variance ⇒ Object
variance of an array of numbers.
-
#standard_deviation ⇒ Object
standard deviation of an array of numbers.
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 |