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
Global Behavioral changes
While older version of 'mathn', just by required, caused changes to
the behavior (and even the types) of operations on classes like
Integer newer mathn
introduces the refinements Math::N
, and you
have to enable it.
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.
Installation
Add this line to your application's Gemfile:
gem 'mathn'
And then execute:
$ bundle
Or install it yourself as:
$ gem install mathn
Usage
require 'mathn'
using Math::N
Development
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.
Contributing
Bug reports and pull requests are welcome on GitHub at https://github.com/ruby/mathn.
License
The gem is available as open source under the terms of the MIT License.