This is code used, mostly, as homework for the course "Métodos Numéricos" in the Q2 of 2018 at FGV/EPGE. This is a graduate course for Economics students on numerical tools to solve structural models taught by Prof. Cezar Santos. You might find important information about the course on its Wiki page.
Use my code as you wish. If you find the bugs, please let me know. I would appreciate any pull requests!