childprocess

https://github.com/enkessler/childprocess

Ruby

Cross-platform Ruby library for managing child processes.

Matrix#+

Matrix addition.
  Matrix.scalar(2,5) + Matrix[[1,0], [-4,7]]
    =>  6  0
       -4 12

Source | Google | Stack overflow

Edit

git clone [email protected]:enkessler/childprocess.git
cd childprocess
open

Contribute

# Make a new branch
git checkout -b -your-name--update-docs-Matrix---for-pr

# Commit to git
git add git commit -m "better docs for Matrix#+"

# Open pull request
gem install hub # on a mac you can `brew install hub`
hub fork
git push <your name> -your-name--update-docs-Matrix---for-pr
hub pull-request

# Celebrate!