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Messages - Anima

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Math and Science / Re: TI-84 program for indefinite integrals
« on: March 01, 2014, 01:20:14 pm »
No, unfortunately this is almost impossible except for basic integrals of polynomials like x^2. Mathematica solves indefinite integrals using the Risch algorithm, which is quite difficult to implement.

Math and Science / Re: Terminating decimal
« on: February 24, 2014, 08:16:44 am »
But this would mean that 2 will never be a factor of (5k+1)/2, because it is always odd. So, (5k+1)/2=5m?

Math and Science / Re: Terminating decimal
« on: February 24, 2014, 07:46:23 am »
Thank you :)

2n-1=5k ==> n=(5k-1)/2
But this should be n = (5k+1)/2, right?

Math and Science / Terminating decimal
« on: February 24, 2014, 06:35:11 am »
Hey, I had a math exam today and there was the following problem: For which positive integers n is (4n + 1)/(n * (2n - 1)) a terminating decimal?
With terminating decimals are meant non-periodic numbers like 1.25 or -2.22, I guess. My first idea was to write this fraction as 6/(2n - 1) - 1/n or 4/(2n - 1) + 1/(2n^2 - n) and then create a system of equations, where the first and the second denominator are equal to something like 2^p * 5^q.
How would you proof this?

[DE] Andere Programmierthemen und -hilfe / Re: Probleme mit Zoom Math
« on: October 21, 2012, 10:12:05 am »
Naja, eine kostenlose Alternative habe ich bisher noch nicht gefunden. Die App ist mit Sicherheit deswegen so teuer, weil die Entwickler sehr viel Zeit in die Programmierung gesteckt haben, denn ein CAS schreibt man nun leider mal nicht von heute auf morgen.
Wenn du sagen könntest, was du genau benötigst, könnte ich dir aber einige Programme nennen, die in etwa das können, was Zoom Math auch kann. Für Ableitungen und Termvereinfachungen eignet sich, wie Sorunome bereits gesagt hat, Symbolic ganz gut.

Yesterday I found a cool game called "Not Tetris 2" written in Lua. It's similar to Tetris but with physics, so the blocks are rotating and it's more difficult to complete a row than in the original version.
Now I thought it could be possible to create a clone of "Not Tetris 2" for a calculator like the TI-84 Plus. But it seems like BASIC is not enough because of performance reasons, so in my opionion Axe or Assembly would be a better choice. What do you think? Personally I'm neither very experienced in Axe nor Assembly.

By the way, here's the project homepage of the developer:

In Sachsen wie schon erwähnt sind Grafiktaschenrechner soweit ich weiß an fast jedem Gymnasium zugelassen (an unserer Schule der TI-84 Plus). CAS-Rechner dürfen wir hingegen nicht benutzen, aber es gibt ja genügend Apps und Programme, mit denen man einen GTR erweitern kann. :D

TI Z80 / Angry Birds
« on: March 20, 2012, 02:29:58 pm »

I'm very new to Axe, but I thought about a very interesting project: Angry Birds for the TI-84 Plus.
But before I start working, I've got a few questions:

1. At the moment I need a sprite for the title screen, best would be grayscale or so. I'm not so good in making graphics, so is there someone who could help me? ;D
2. The next point are the controlls, on Android smartphones you've got a touchscreen, but not on the TI-84 Plus. So I have to use the arrow buttons, but this seems very awkward I think. Anyone ideas how this could be realized?
3. I want to make a level editor like in Super Mario from Sam Heald. Problem is that I don't have any ideas how to parse the level files. Can someone tell me, how he do that?
4. How can I check what programs are on the calculator? I want to make a level list, so that the user can select an existing level.

Hope you can help me. :)

Math and Science / Re: Symbolic Integration
« on: March 09, 2012, 11:12:49 am »
The problem is that there's a systematic way to find a derivative of a program, but much of integration is inductive—and not all functions even have integrals that can be expressed normally, remember.
Well, I wouldn't really care, if the program can't calculate an integral, because most of the integrals we have in school are solvable.
Now... is there any useful algorithm for symbolic Integration? What algorithms are used by the TI calculators with CAS?

Math and Science / Symbolic Integration
« on: March 09, 2012, 10:14:12 am »
Hey guys,

I was thinking about making a program, which integrates a function symbolically, this sounds stupid and very hard, but is it really so difficult? Which algorithms are used by software like Mathematica?
I think it'd be possible, because one genius in my school made a program, which calculated the derivative of a function without using Symbolic! Well, i know calculating derivatives is a lot easier than calculating integrals, but it should be possible with Asm or so? Such a program would be so cool. :D

~ Anima

ASM / Unrecognized instruction (TASM)
« on: February 13, 2012, 08:09:07 pm »

I want to learn ASM with the tutorial "Assembly In 28 Days". So, when I want to compile a z80 file, it shows me the following errors:

"c:\asm\source\hello.z80 line 0007: unrecognized instruction. (B_CALL(_CLRLCDFULL))"
"c:\asm\source\hello.z80 line 0011: unrecognized instruction. (B_CALL(_PUTS))"
"c:\asm\source\hello.z80 line 0012: unrecognied instruction. (B_CALL(_NEWLINE))"

That's the file, which I've copied to my tasm directory and here is my source file (hello.z80):

Code: [Select]
#include ""
#define    ProgStart    $9D95
.org    ProgStart - 2
    .db    t2ByteTok, tAsmCmp
    ld    hl, 0
    ld    (PenCol), hl
    ld    hl, msg
    b_call(_PutS)            ; Display the text

    .db "Hello world!", 0

So, is something wrong with my code? Hope you can help me.

What about "Minicraft" in Axe? ;D
It's not in 3D, so it couldn't be impossible? :P

TI Z80 / Re: Pokemon Topaze (Axe)
« on: December 31, 2011, 06:48:01 am »
Awesome! :D

F-Zero 83+ / Re: F-Zero Progress Thread
« on: December 24, 2011, 06:55:19 pm »
Mario Kart would be so awesome though. :P

TI Z80 / Re: Pokemon Topaze (Axe)
« on: December 24, 2011, 06:53:56 pm »
There is also a problem with "A critical hit" that was not translated :P.
Translate it with "Ein Volltreffer !". ;)

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