Get the mode value : Math extensions « Development « Ruby

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3. Math extensions

Get the mode value

def mode(x)
  sorted = x.sort
  a = Array.new
  b = Array.new
  sorted.each do |x|
    if a.index(x)==nil
      a << x # Add to list of values
      b << 1 # Add to list of frequencies
    else
      b[a.index(x)] += 1 # Increment existing counter
    end
  end
  maxval = b.max           # Find highest count
  where = b.index(maxval)  # Find index of highest count
  a[where]                 # Find corresponding data value
end

data =[7,7,7,4,4,5,4,5,7,2,2,3,3,7,3,4 ]
puts mode(data)            # 7

 

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