Percentrank

Add Array#percentrank(value) and Range#percentrank(value).

Function description, See PERCENTRANK function - Excel - Office.com (in Japanese: PERCENTRANK 関数 - Excel - Office.com).

Installation

Add this line to your application's Gemfile:

gem 'percentrank'

And then execute:

$ bundle

Or install it yourself as:

$ gem install percentrank

Usage

require 'percentrank'

([125, 150, 160, 90]).percentrank(125)  #=> 0.33.
([12 , 13, 14, 10]).percentrank(14)  #=> 1 .

Contributing

1. Fork it
2. Create your feature branch (git checkout -b my-new-feature)
3. Commit your changes (git commit -am 'Add some feature')
4. Push to the branch (git push origin my-new-feature)
5. Create new Pull Request