Deprecated library that extends math operations.
BSD-2-CLAUSE License
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.