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 Posted: Tue Jan 09, 2007 3:19 pm
I got a Ti-89 Titaneium Graphing Calculator for my math class. This thing is more powerful than my first computer I think. I may need a class on how to operate this thing.
I haven't figured out how to get it to do decimals yet. I did set the clock and calendar though, and felt pretty proud of myself for doing so.
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Posted: Tue Jan 09, 2007 8:22 pm
Oh, I had one of those and I absolutely loved it! If a whole class has them, you can connect to a pod with the USB port and a moderator can set up competitions, polls, games and interactive. It's the greatest thing! And I love the graphing of course. Trigonometric functions made me smile.
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Posted: Wed Jan 10, 2007 12:59 pm
We figured out how to get it to graph a line when we put the equation in today. We're working on parabolas next. they are cool!
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Posted: Thu Jan 11, 2007 2:19 pm
Those are so awesome! I have a crappy calculator, I'm trying to convince my mum that I NEED a TI-somethingorother..I don't know which one to get O:
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Posted: Fri Jan 12, 2007 1:12 pm
lol I was told that my calculator is a video game for math geeks.
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Posted: Sat Jan 13, 2007 12:37 pm
I have a TI-83 PLUS. I asked for it for my birthday ^_^
I didn't know there was a TI-89 out yet.
Anyways, I'm also a physics and music geek, so I graphed sine waves at different frequencies and looked at the relationship between musical intervals, and the "partials" on a trumpet. One fun equation is Y=10sin(x^2)
Note: the 10 is just to fit the sine wave to the screen.
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Posted: Sun Jan 14, 2007 4:53 pm
Sapphina lol I was told that my calculator is a video game for math geeks. That's partially true. When I have nothing else, I experiment with the shapes it makes with different parabolic equations. It's fun.
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Posted: Tue Jan 23, 2007 7:58 am
Ahhhh...I can't figure out how to get my graphing calculator to do decimals again!
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Posted: Sat Feb 03, 2007 7:20 am
I've had my TI-84 plus for a while now and it's still really fun.
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Posted: Sat Feb 03, 2007 5:46 pm
I also have a TI-84 plus, but my brother needs it for his pre-calculus class(I wanted to be in that class so bad, but it is full). My calculator looks so primitive compared to my friend's TI-89 Titanium. crying
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Posted: Sat Feb 17, 2007 12:01 pm
I love playing with polar functions. biggrin I think I wrote down all the most aesthetically appealing ones.
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Posted: Sun Feb 18, 2007 2:28 am
You can't be a real math geek until you get a calculator that uses RPN -- reverse Polish notation. I still love my HP48G...
Reverse Polish notation is also known as postfix notation, whereas the usual notation you use for math is infix notation. For example, normally, for 2+3, you'd press 2, +, 3, and = in order, but on an RPN calculator, you'd press 2, [enter], 3, and + -- the operator, +, operates on the two previous values. After you get used to using infix notation, you start to realize that it is actually a much clearer method of expressing math -- it just isn't what you're used to.
RPN also has the benefit of teaching an inherent understanding of stack operations, which is very important in computer science.
RPN calculators offer two additional benefits. Number one is that no one can borrow your calculator ("Hey, where's the equals button on this thing????"). Number two is that having such a weird calculator reinforces your ultra-geek image.
wink
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Posted: Sun Feb 18, 2007 7:56 pm
I have no idea how to work my calculator. The damn this is smarter than me and it's always taunting me! gonk
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Posted: Fri Mar 16, 2007 5:47 pm
Aren't you supposed to be able to put games one the TI ones? It doesn't work for mine, they download but they go in the program section instead of the apps one and they don't play. confused
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Posted: Fri Apr 13, 2007 9:03 am
Yes there are games that you can download for the TI 89.
As for Postfix vs. Infix, there are conventions in math that make it work the way it does. The agreed upon method is Infix. There is a reason for this that has to do with getting the same answer for the same question every time.
If you go into the f2 window on the TI89 you can change the resolution so that you can graph and fit to the screen as large a graph as you need to.
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