GNU Octave

Oh, and matlab IDE is not half bad either.
I used to use emacs because I'm a memester but I recall from the recitations the IDE had nice builtin documentation and the debugger was easy to get along with.
But I got a meme cred to protect so emacs it was

Do you use linux then?

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then you go to a shit uni I guess. I'm sure every other undergrad in engineering has a cracked license of matlab. Back when I was an undergrad I recall everyone had a pirated version of matlab (because we didn't had to register and renew it every 6 months). Even the professor I slaved for for recommendation letters had a pirated matlab on his own macbook.
Grab one and install it in a virtual machine.

Yup. I was using ubuntu back then and it ran smoothly. matlab 2011b if I recall.

If you can't get your script to work in octave maybe coding isn't for you.

t. Used octave in uni for ME degree

Ah, I tried to use emacs on windows but some of the stuff doesn't work that well..
Do you still use Matlab now?

If I had to use windows I guess I'd use emacs there, but I don't so I won't.
I read online pdf-tools don't work on windows so that's would be a big pain in the neck.
I don't use matlab now, at least not as much.
I changed to python as it was what meme learning people use and I'm lurking them.
I've never get to use Julia but I might give it a try some day.
Last time I use matlab, it was to use the signal library because I wanted to design a FIR filter with the remez algorithm and scipy wasn't doing so good.