Module: Enumerable

Defined in:
lib/zombie_check/core_ext/ennumerable.rb

Instance Method Summary collapse

Instance Method Details

#mean ⇒ Object 



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# File 'lib/zombie_check/core_ext/ennumerable.rb', line 7

def mean
  # rubocop bug, other way it dies https://github.com/bbatsov/rubocop/issues/3169
  return -1 if send(:length) == 0
  sum / length.to_f
end

#median ⇒ Object 



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# File 'lib/zombie_check/core_ext/ennumerable.rb', line 20

def median
  return -1 if send(:length) == 0
  middle = length / 2
  sorted = sort
  length.even? ? (sorted[middle] + sorted[middle - 1]) / 2 : sorted[middle]
end

#sigma ⇒ Object 



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# File 'lib/zombie_check/core_ext/ennumerable.rb', line 13

def sigma
  return -1 if length < 2
  m = mean
  sum = inject(0) { |accum, i| accum + (i - m)**2 }
  Math.sqrt(sum / (length - 1).to_f)
end

#sum ⇒ Object 



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# File 'lib/zombie_check/core_ext/ennumerable.rb', line 3

def sum
  inject(0) { |accum, i| accum + i }
end