Jason::Math

A Math gem.

Not production ready. The eventual goal is to underpin with performant C code, probably built from my red OS abstraction.

This library may be useful, at this time, for educational purposes, as the pure Ruby algorithms are typically closer to English.

I use this library to complete challenges on various platforms. Sorry about the self-indulgent naming, I wanted to simply call the gem Math and that namespace was obviously taken.

Installation

Add this line to your application's Gemfile:

gem 'jason-math', git: 'https://github.com/jasoncolburne/jason-math', branch: 'main'

And then execute:

$ bundle

To update in the future, use:

$ bundle update

Usage

Here is an example of a solution for https://projecteuler.net/problem=12

require 'rubygems'
require 'bundler/setup'
require 'jason/math'

n = 1
while true do
  t = Math.polygonal_number(3, n)
  break if t.divisors.count > 500
  n += 1
end

puts Math.polygonal_number(3, n)

This gem monkeypatches several core classes. If this is not desirable to you, try something like this (the same code without the convenience methods):

require 'rubygems'
require 'bundler/setup'
require 'jason/math/number_theory'

n = 1
while true do
  t = Jason::Math::NumberTheory.polygonal_number(3, n)
  break if Jason::Math::NumberTheory.divisors(t).count > 500
  n += 1
end

puts Jason::Math::NumberTheory.polygonal_number(3, n)

The only caveat here is that I may have used some of the convenience methods within the library code itself, meaning the gem may require a bit of refactoring to work correctly. If you notice a NoMethodError on Math, Integer, Array, Set or Hash please send me steps to reproduce.

Development

After checking out the repo, run bin/setup to install dependencies. Then, run rake spec 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. Do not release this gem yet. It is still under development. If you make a useful modification, consider creating a pull request.

Contributing

Bug reports and pull requests are welcome on GitHub at https://github.com/jasoncolburne/jason-math. This project is intended to be a safe, welcoming space for collaboration, and contributors are expected to adhere to the Contributor Covenant code of conduct.

License

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

Code of Conduct

Everyone interacting in the Jason::Math project’s codebases, issue trackers, chat rooms and mailing lists is expected to follow the code of conduct.