Class: Array

Inherits:
Object show all
Defined in:
lib/sequence_logo/ytilib/addon.rb

Instance Method Summary collapse

Instance Method Details

#average ⇒ Object Also known as: mean 



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# File 'lib/sequence_logo/ytilib/addon.rb', line 43

def average
  self.empty? ? nil : self.inject(0) { |sum,s| sum += s } / self.size
end

#shuffle ⇒ Object 



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# File 'lib/sequence_logo/ytilib/addon.rb', line 26

def shuffle
  arr = self.dup
  arr.size.downto 2 do |j|
    r = rand j
    arr[j-1], arr[r] = arr[r], arr[j-1]
  end
  arr
end

#shuffle! ⇒ Object 



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# File 'lib/sequence_logo/ytilib/addon.rb', line 35

def shuffle!
  (size - 1).downto 1 do |i|
    j = rand(i + 1)
    self[i], self[j] = self[j], self[i]
  end
  self
end

#sum ⇒ Object 



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# File 'lib/sequence_logo/ytilib/addon.rb', line 52

def sum
  self.inject(self[0]) { |sum,s| sum += s} - self[0]
end

#variance ⇒ Object 



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# File 'lib/sequence_logo/ytilib/addon.rb', line 48

def variance
  return self.collect { |s| s*s }.average - average**2
end