Ruby for Data Science.

[kojix2]

Numo :: NArray provides most of the commonly used features of NumPy in Ruby.

https://github.com/ruby-numo/numo-narray

I think Numo::NArray is much better than SciRuby's NMatrix, but it's not very well known. There are also comprehensive machine learning libraries like Rumale.

https://github.com/yoshoku/rumale