Module: Enumerable

Included in:
Meta::Pool
Defined in:
lib/enumerable.rb

Overview

enumerable.rb - Add Math functionalities to enumerable

ToDo: refactor, it’s not the right approach: used in Bio::Ngs::Cufflinks::Diff.process_de

Copyright

Copyright © 2011

Raoul Bonnal <[email protected]>,
Francesco Strozzi <[email protected]>
License

The Ruby License

Instance Method Summary collapse

Instance Method Details

#average ⇒ Object

average of an array of numbers



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# File 'lib/enumerable.rb', line 21

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

#sample_variance ⇒ Object

variance of an array of numbers



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# File 'lib/enumerable.rb', line 26

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.rb', line 33

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

#sum ⇒ Object

sum of an array of numbers



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# File 'lib/enumerable.rb', line 16

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