From: Trans <transfire@...>
Date: 2008-10-01T08:33:49+09:00
Subject: Re: Mode method for Array



On Sep 30, 5:56 pm, Glenn <glenn_r...@yahoo.com> wrote:
> Hi,
>
> I'd like to write a get_mode method for the Array class.  The method would return an array of the most frequently occurring element or elements.
>
> So [3, 1, 1, 55, 55].get_mode would return [1, 55].
>
> I have a way to do this but I don't know if it's the best way.  I was wondering if anyone had any suggestions?

Facets has:

  module Enumerable

    # In Statistics mode is the value that occurs most
    # frequently in a given set of data.

    def mode
      count = Hash.new(0)
      each {|x| count[x] += 1 }
      count.sort_by{|k,v| v}.last[0]
    end

  end

Hmm.. but that thwarts ties. I'll have to consider how to fix.

T.