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Math Help - How do I make a TI-89 macro?

  1. #1
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    How do I make a TI-89 macro to limit domain of functions?

    Hi,

    I'm wanting to set up a macro for my calculator that lets me define domain for values of X when I solve a problem.

    Instead of having to type |x>=0 and x<=whatever, I want to have it hotkeyed to just drop that in whenever I hit a combination of buttons.

    How do I do this?


    EDIT: I'd also like to be able to set domain of my trigonometric functions, but don't know the syntax for that.
    Last edited by Wolvenmoon; November 8th 2009 at 12:23 PM.
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  2. #2
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    *Bump*

    when I want to say sin^-1(1/2) when theta is > pi/6 ( or 30 degrees ), you'd think I'd enter

    sin^-1(1/2)|(theta)>pi/6 , but this does not work.

    Why?
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  3. #3
    Newbie Bill Zimmerly's Avatar
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    Wink

    For all functions operating on a variable, the variable must be specified on both the left and right sides of the "|" symbol. (It's also a useful practice to use a letter like "x" rather than theta - since you only need press one key to enter it.) With that in mind, try entering this...

    sin-1(x) | x > 30

    (Assuming approximate mode and degrees for angles.)
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  4. #4
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    I'm in exact mode, I can't quite get it to give me the result I want with that.

    I got it to work by using the solve function.

    solve(sin(x)=1/2,x)|x>30 and x<360
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  5. #5
    Newbie Bill Zimmerly's Avatar
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    Great! (It's a wonderful tool, isn't it! )
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  6. #6
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    It's an awesome tool! Very powerful, especially in lower classes. I make sure I actually know how to do something by hand ( as it is presented to me in my math book ) before I use it.

    I actually started in beginning algebra with it, and purposefully didn't learn any of the functions that worked with X until late intermediate algebra / college algebra ( Though I ended up missing the last 5 weeks of my intermediate algebra class due to some really scary health issues, so it was a lifesaver )
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