Um, I have a question pertaining to the TI89 and TI92+. I own both of those calculators. Now, isn't

-12 * -12 = 144 right?

But if you enter it as

-12^2 the calculator answers with -144

The calculator gives you -144. I have tried this on both the 89 and the 92+. The hardware versions are different on both calcs, the 89 has 1.00 and the 92+ has 1.05. I didn't know if I was doing something wrong. Let me know....

Jordan

Yeah, the TI-86 has the same problem! But it doesn't happen when you assign -12 to a variable, and use that variable for the computations.

You must put (-12)^2 Because in the order of operations, the Exponent is worked out before the negation.

well this is not a problem, i mean this is normal mathematics rules
-12^2=-(12^2)

I think this is in the manual for all calculators...

When you put -12^2, you're really putting -(12)^2. You have to put (-12)^2 to get the correct answer.

Any reason why this happens? Probably the EOS or the CAS way of doing this is: exponent first, positives and negatives later.

This is not just a matter of programming. If you WRITE -12^2, it is MATHEMATICALLY equivalent to -(12^2).

Shame on all of you! Look at all the replies to this one topic. what-his-name, the guy that wrote it meant no ill will but you all have made this one beautiful thing ugly. i am talking about ti calcs. they the greatest tools i have ever used and you have distroyed any chance of improvement by obsessing so much. i am not saying you are geeks (although you are, as am i) but printers?! color?! is that neccesary to science and math?! you allready can print off your computer (w/ graphlink)! i agree with a lot of you but not most. first of all:

better prossesor good idea
printer bad idea
color bad idea
modem bad idea

how dare you! you have scared ti programmers away! they made the ti's for math and science, not games. what does color have to do with math? i would like to ,on behalf of those that agree with me, apologize to those that work at ti in hopes that they may consider some of our homble requests.

P.S. i have ti-83, i love it, and am planning to move to Vermont to get married so don't say i dont know what i am talking about!!

"better processor good idea"

That's a bad idea; TI can reduce costs by sticking with the same processors they've been using, and also learn to code for the m68k's better as time goes by; must I once again point out the hp49g uses a 4 mhz saturn chip they've been using for 14 years and it can outdo the 89 in 3d graphing?

And faster chips generate more heat.
And they use more battery power.

We've been over this: a faster chip equals bad in the long run.

So does a color display. These eat batteries like nobody's business.

I want support for programs on my calculator.
Period.

--BlueCalx

I would like to edit my previous comment. "faster procesor" should be replaced with "better programers". what ti needs is bill nagel. what ever happened to him?

What the hell???????????
Are you even reading the discussion? (and it is being a good one, a really serious one) It's not about printers or color or modems,it's about everything that could be improved, and a lot of it to do with math.

These are good ideas, but here's a better one:

the ability to run programs written for the 82, 83, 85, and 86.

btw, you can have string arrays in TI-basic. Just combine some equal-length strings (to make them equal in length, add spaces to the end) to form one large one. Then use sub([string variable],L*S+1,L) for an element in the "array", where L is the length of a string array element and S is the index (if the first element is zero). This method works well for my TI-83 Phone Book program.

read: ASE/YAS for the 86, Ion86 for the 86

I think that just having I/O port compatability would be great, if you compromise missing functions on earlier calcs.

Why dont you make your proposals simple & send them
to WWW.TI.COM ... ?
I already did that, i sent a letter with my own ideas:
- a 20 Mhz processor
- A bigger screen to the TI-89
- New math funtions
- ...
Then, they just tell us to wait until ... 2 or 3 years ...
or they'll say " We'll keep you inform"

I want a real calculator for the real ( engineering ) world, but
sometimes TI-89 / TI - 92 doesnt replace a PC.

20 mhz is an unnecessary function; read my replies to others who say "I want a faster/better processor".

A calculator isn't meant to replace a PC; they're meant to help you utilize their mathematical functions in order to learn more about math itself.

Yeah, a 20 mhz processor isn't really that nessesary, but it would make it a lot nicer. Programs, even those for math can get quite long and slow sometimes. With a TI-89 though it really isn't that bad.

I'd rather have better coding for the AMS and games than get a calculator that'll need a fan

I think the TI calculators are plenty powerful eonugh to do what they were meant ot do. For all you wanting a more powerful processor with more memory, a bigger screen, color, and it being portable, then I know what you can get...




A LAPTOP!

So stop complaining about what the calcs. don't have. A calculator was meant to calculate things (hence, the term "calculator") If they were to make it what you want it to be, then get a lot of batteries because you'll need them. If you want something to do engineering schematics and much more powerful stuff, then get a laptop. After all, if TI adds your requests into the calculator, then the calculator will turn into a laptop.

Why dont you make your proposals simple & send them
to WWW.TI.COM ... ?
I already did that, i sent a letter with my own ideas:
- a 20 Mhz processor
- A bigger screen to the TI-89
- New math funtions

Then, they just tell us to wait until ... 2 or 3 years ...
or they'll say " We'll keep you inform"

I want a real calculator for the real ( engineering ) world, but
a TI-89 / TI-92 doesnt replace a PC.

Sometimes I fell that TI leaves US alone saying:
there is your tool ... just use it!!!
( the best way you can )

I think that this is a great idea. I am trying to figure out how TI overwrites the version of TIOS currently on the calculator with the new one. Then, I might be able to write my own version of an operating system, or possibly reverse-compile theirs and use the code from it, just add to it (of course I would give them credit). As for a faster processor, there are many ways of making the calc faster. Turbo 83+ greatly increases the speed, and there is something somewhere on ticalc.org that tells you how to boost the cpu speed to 24 MHz by physical means.

I don't think they'd want credit if you were to reverse-compile their OS; I think, instead, they'd be looking for either a nice amount of money or a lawsuit

errr.... I thought reverse engineering was forbidden...