childprocess

https://github.com/enkessler/childprocess

Ruby

Cross-platform Ruby library for managing child processes.

Matrix#-

Matrix subtraction.
  Matrix[[1,5], [4,2]] - Matrix[[9,3], [-4,1]]
    => -8  2
        8  1

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!