1

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!

Peter Nerlich
  • 225
  • 1
  • 11

1 Answers1

0

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.

harold
  • 61,398
  • 6
  • 86
  • 164