### Author Topic: Analyze mathematical functions?  (Read 1326 times)

0 Members and 1 Guest are viewing this topic.

#### Anima

• LV4 Regular (Next: 200)
• Posts: 133
• Rating: +4/-0
##### Analyze mathematical functions?
« on: November 24, 2011, 01:01:47 pm »
Hello,

is there a program to analyze mathematical functions with the TI-84+?
I mean things like monotony, symmetry, range for f(x) and so on that can't be done with the commands in the CALCULATE menu.
If there isn't such a program available, I wanna try to develop it. I already know that most of this stuff can be done with the first derivation.

So is this possible in pure TI-Basic?

Sorry for my bad English. I'm German.

#### Hayleia

• Programming Absol
• Coder Of Tomorrow
• LV12 Extreme Poster (Next: 5000)
• Posts: 3367
• Rating: +393/-7
##### Re: Analyze mathematical functions?
« Reply #1 on: November 24, 2011, 01:54:48 pm »
I don't know any program like that. Maybe it exists, but I don't know. Never seen one before.

So is this possible in pure TI-Basic?
Everything is possible with any language. TI-Basic's problem is speed, but it can handle everything.

Also, Symbolic has a built-in derivation algorithm. I am not telling you to use it, but at least, with it you could test the other parts of your program (to check if your own derivation algorithm was correct and if what comes next uses it well). Or you can even use Symbolic's one. Do what you want, in fact

I can't wait to see what you're going to do with this
« Last Edit: November 24, 2011, 01:55:27 pm by Hayleia »
I own: 83+ ; 84+SE ; 76.fr ; CX CAS ; Prizm ; 84+CSE
Sorry if I answer with something that seems unrelated, English is not my primary language and I might not have understood well. Sorry if I make English mistakes too.

#### Anima

• LV4 Regular (Next: 200)
• Posts: 133
• Rating: +4/-0
##### Re: Analyze mathematical functions?
« Reply #2 on: November 25, 2011, 07:31:43 am »
Ah thanks, I know Symbolic, but I can't use it in programs (no idea why).
At first the good message: I've programmed such an application yesterday and it's almost finished.
The bad message: It does only work with Quadratic functions like -2x² + 6x + 8 or (x + 2)² - 3 (no sin(x), cos(x), tan(x), ...).

By the way, is there a way to find the zeros of a function in Y1 without using the solve() command?

// Edit: I made some screenshots. That is what i got so far.
« Last Edit: November 25, 2011, 07:41:44 am by Anima »

Sorry for my bad English. I'm German.

#### Hayleia

• Programming Absol
• Coder Of Tomorrow
• LV12 Extreme Poster (Next: 5000)
• Posts: 3367
• Rating: +393/-7
##### Re: Analyze mathematical functions?
« Reply #3 on: November 25, 2011, 03:32:28 pm »
Ah thanks, I know Symbolic, but I can't use it in programs (no idea why).
Anyway, not everyone has Symbolic, so at the end, you would have to do an algorithm.
Here is what I found for you (but don't forget to give credits to the author if you are using it).
I own: 83+ ; 84+SE ; 76.fr ; CX CAS ; Prizm ; 84+CSE
Sorry if I answer with something that seems unrelated, English is not my primary language and I might not have understood well. Sorry if I make English mistakes too.