Gem matrix needed for Ruby version > 3.0

[jfanals]

I was getting this error when trying to load Rails 7 and Ruby 3.1.2

 `require': cannot load such file -- matrix (LoadError)

As of Ruby 3.1.0 the matrix default gem are now bundled gems.
https://stackoverflow.com/questions/71991514/rails-require-cannot-load-such-file-matrix
https://www.ruby-lang.org/en/news/2021/12/25/ruby-3-1-0-released/

Adding the matrix gem to the Gemfile solved the issue.

 gem 'matrix'

[ankane]

Hey @jfanals, thanks for reporting! Fixed in the commit above (not sure why I only thought it was needed for Daru). Will push a new release shortly.

[jfanals]

That was fast!

Thank you for your amazing gems :)