Hello again!

You might know me from the Symbolic Derivative Project. I thought I could do better so I am working on a CAS (computer algebra system) for the TI 84+ CE. It is nearly done and I want to tease a little bit about the progress and work I still have to do before it is released. It is called PineappleCAS and you can check it out here: https://github.com/nathanfarlow/PineappleCAS

It can already simplify algebra identities and like terms, manipulate complex numbers, expand things (A+B)(B+C) or (A+B)^8, evaluate large constants like 2 * 3 ^ 1001 that the calculator cannot do normally, and can take derivatives. You can then simplify the derivative and it will look way better than the simplified result of the previous project.

You will be able to pass arguments to PineappleCAS from a TI BASIC program to operate on algebra from within a TI BASIC program.

The only things that I need to finish up is a little of the GUI and implement the TI-BASIC interface.

Here are some screenshots:

If you want to see other expressions that will be accepted by the program you can look at the tests file: https://github.com/nathanfarlow/PineappleCAS/blob/master/tests.txt

Some things I already forgot that are included: Evaluating factorials, combining fractions, and trig constants like sin(pi) = 0 or trig identities like sin(X+2pi) = sin(X)
is usage through the GUI, or can I do 1:prgmCAS to simplify, 2 for derivative, etc?

Also, can't wait to see this done, I know I'll use it A LOT!
I am still deciding the best way to implement it, but yes you will be able to use it in that way from a ti basic program. It will read arguments from the Ans variable. The format might look something like:

"SIMP,Y1,Y2":Asm(prgmPCAS)

and of course you could separate these to two different lines.
Congratulations!
I've followed your progress on GitHub but this is some seriously impressive work as I've said before

I encourage you to post that same topic on other forums as well (TI-Planet, CodeWalrus) as the project clearly deserve attention from the whole community!
And also once it's finished don't forget to upload it to ticalc.org since it's the only way to get it featured and potentially chosen for POTY.
Congratulations!
I've followed your progress on GitHub but this is some seriously impressive work as I've said before

I encourage you to post that same topic on other forums as well (TI-Planet, CodeWalrus) as the project clearly deserve attention from the whole community!
And also once it's finished don't forget to upload it to ticalc.org since it's the only way to get it featured and potentially chosen for POTY.

Thanks! I will definitely be doing this when it's up and running.
This is pretty cool! I know c4ooo also did some pretty cool work in Axe (for the monochrome calcs) similar to this. I don't think they ever publicly released it, but it did basic symbolic manipulation on generic functions and variables, including (and especially) derivatives.
The gui is done! There may be some bugs, but you can now test the full functionality of the CAS. All I need to do now is to implement the ti basic interface and add some documentation.

Thoughts on the basic interface? I would love to see a basic program that utilizes PCAS to give the first few exact terms of a taylor series polynomial for any function in Y1.

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