Mathn

mathn serves to make mathematical operations more precise in Ruby and to integrate other mathematical standard libraries.

Without mathn:

3 / 2 => 1 # Integer

With mathn:

3 / 2 => 3/2 # Rational

mathn keeps value in exact terms.

Without mathn:

20 / 9 * 3 * 14 / 7 * 3 / 2 # => 18

With mathn:

20 / 9 * 3 * 14 / 7 * 3 / 2 # => 20

When you require 'mathn', the libraries for Prime, CMath, Matrix and Vector are also loaded.

Requiring mathn causes changes to the behavior (and even the types) of operations on classes like Integer and it applies to the entire process, not just the file or gem which includes mathn. Therefore, we recommend that instead of requiring mathn, you instead explicitly specify rational values as desired, for example:

3r / 2 => 3/2 # Rational
20r / 9 * 3 * 14 / 7 * 3 / 2 # => 20

Before ruby 2.5, mathn was part of the ruby standard library. It was was deprecated in ruby 2.2.0, and removed from ruby 2.5.0. In order to use the library with a current version of ruby, you must install it as a gem.

Add this line to your application's Gemfile:

gem 'mathn'

And then execute:

$ bundle

Or install it yourself as:

$ gem install mathn

require 'mathn'

After checking out the repo, run bin/setup to install dependencies. Then, run rake test to run the tests. You can also run bin/console for an interactive prompt that will allow you to experiment.

To install this gem onto your local machine, run bundle exec rake install. To release a new version, update the version number in version.rb, and then run bundle exec rake release, which will create a git tag for the version, push git commits and tags, and push the .gem file to rubygems.org.

Bug reports and pull requests are welcome on GitHub at https://github.com/ruby/mathn.

The gem is available as open source under the terms of the MIT License.