So there is this Calculator my teacher gave me to try to fix a program that worked in a previous version (probably the Ti-83). According to her it should give the derivation of an equation. The input is self-explaining and the rest of the code is rather simple:
PROGRAM:DER
:Input "EQUATION:",Str1
:Input "VAR:",Str2
:Real(12,Str1,Str2)→Str3
:Real(19,Str3
:
:
So now I'm somewhat freaked out by that Real( token there, because the catalog only lists Real and real(, where the last one only takes one argument.
So my question is: What the f*ck is that and how did it work?? Also, of course, do you have any idea how I can make a program calculating the derivation for the Ti-84 Plus? Thank you in advance!
That's for the Symbolic parser hook if you also have Omnicalc installed. Symbolic is an app that provides (among other things) symbolic differentiation. It interfaces with BASIC using a parser hook (and a token hook to change how you see it on the screen), meaning that when a real( is encountered, it will look at what comes after it and intercept it if it's clear you're not trying to get the real part of a complex number. It's shown as real( if you also have Omnicalc installed, otherwise it should show as d( and so on (matching how it looks in the menu, accessed with [math][math]). Symbolic and Omnicalc both use the parser hook, which would normally pose a problem, but Omnicalc knows about Symbolic and "chains" the hooks.
real(12 (aka d() is for symbolic differentiation.
real(19 (aka pretty() probably prettifies a formula, it only works if you also have the Pretty Print app installed.