roulette_wheel

setup value and its probability, spin, and get result.

RouletteWheel

TODO: Write a gem description

Installation

Add this line to your application's Gemfile:

gem 'roulette_wheel', github: 'shinji-yoshida/roulette_wheel', tag: 'v0.2.0'

And then execute:

$ bundle

Usage

require 'roulette_wheel'

fixed_prob_roulette = RouletteWheel.with_fixed_prob {
  pocket :foo, size: 0.1
  pocket :bar, size: 0.2
  rest :buzz
}

fixed_prob_roulette.has_pocket?(:foo, size: 0.1)
#  returns true
fixed_prob_roulette.has_pocket?(:buzz, size: 0.7)
#  returns false. rest is not pocket.

fixed_prob_roulette.spin
#  returns :foo with probability 0.1, :bar with 0.2, or :buzz with 0.7

relative_prob_roulette = RouletteWheel.with_relative_prob {
  pocket :foo, size: 2
  pocket :bar, size: 3
  pocket :buzz, size: 4
}

relative_prob_roulette.has_pocket?(:foo, size: 2)
#  returns true

relative_prob_roulette.spin
#  returns :foo with probability 2/9, :bar with 3/9, or :buzz with 4/9

Contributing

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