Octave is a great tool, and it addresses a very real need - breaking MATLAB's stranglehold on academic computing.
Every programming course I took as an EE undergrad (other than Intro to Programming) was in MATLAB. 14 years later, and it's still the standard tool in my alma mater's EE department. Having a FOSS equivalent is huge.
So raise a glass to the Octave dev team. They work hard to provide a FOSS tool that can run MATLAB code, which gives you the software you need for self-guided learning from university materials. Or for your all your computational needs.
And Octave is a great tool even if you don't need MATLAB compatibility. Try it out the next time you've got some numerical computing to do.
Not an Octave dev, just a fan of the project.