Introduction to Matrix

https://www.oreilly.com/library/view/learn-arcore/9781788830409/03e5338d-02f1-4461-a57a-ef46a976f96b.xhtml

https://study.com/academy/lesson/difference-between-a-row-column-vector.html

https://www.quora.com/Can-a-matrix-have-a-vector-in-each-element