MathProbability

Quickly find factorals, summations, permutations, combanations and probability answers

Installation

Add this line to your application's Gemfile:

gem 'math_probability'

And then execute:

$ bundle

Or install it yourself as:

$ gem install math_probability

Usage

General Usage:

5.factoral
=> 120
prob = MathProbability::Probability

Sigma(Summation) | Usage: sigma(start, end, formula)

prob.sigma(1,4,"4*x-3")
=> 28

Permutation without repeating | Usage permutation_no_repeat(objects, at_a_time)

prob.permutations_no_repeat(8,5)
=> 6720

Permutation with repeating | Usage permutation_no_repeat(objects, at_a_time)

prob.permutations_with_repeat(8,5)
=> 32768

Combinations | Usage combinations(objects, at_a_time)

prob.combinations(10,4)
=> 210

Probability | Usage probability(choices, outcomes, reduce=true)

prob.probability(1,4)
=> {:decimal=> 0.25, :percentage=>"25.0%", :fraction=>"1/4"}
prob.probability(2,4)
=> {:decimal=> 0.5, :percentage=>"50.0%", :fraction=>"1/2"}
prob.probability(2,4,false)
=> {:decimal=> 0.5, :percentage=>"50.0%", :fraction=>"2/4"}

Running tests

$ git clone git://github.com/polysaturate/math_probability.git
$ bundle install
$ rake   

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