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Calculators Urgent TI-89 Titanium HELP NEEDED!

  1. Apr 26, 2008 #1
    OK, this is driving me nuts. I am learning how to use the calculator, and I can make perfect graphs for any function for x using the Y= Editor
    For ex. f(x)=y="function"

    But how do I make a a function for y? ex. f(y)=x="function"
    I jus spent an hour reading the manual and TI-89Titanium for dummies. I can't find an answer.

    If I convert the x function into a y function it won't be sufficient

    because for a function like x=y^2
    it would be y= ("under root")2
    This would graph only half the function.


    Please help me

    Thank you,
     
  2. jcsd
  3. Apr 27, 2008 #2

    George Jones

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    To graph x =f(y), switch to the parametric mode for graphing, and set xt1 = f(t) and yt1=t.

    Your example becomes

    xt1=t^2
    yt1=t

    In WINDOW, set, for example,

    tmin = -2
    tmax = 2
    xmin = 0
    xmax = 4
    ymin = -2
    ymax = 2
     
  4. Apr 28, 2008 #3
    This still doesn't give the correct graph. It's supposed to give a parabola, but it's only giving half of it. Still the same problem

    it won't give anything for a negative y value.
     
  5. Apr 28, 2008 #4

    George Jones

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    What I detailed in my previous post gives a full parabola on my TI-89. I am puzzled.

    Did you use the values for Window that I gave?
     
  6. Apr 28, 2008 #5
    Bingo!
    Got it.
    Thanks a lot!

    Btw, Do I have to set the minimum and maximum values every time in the WINDOW?
     
  7. Apr 28, 2008 #6

    George Jones

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    In any graphing mode, including function and parametric modes, the minimum and maximum value s in WINDOW might have to be changed when moving from graph to graph. It depends on the individual situations; sometimes no change is necessary.
     
  8. Apr 29, 2008 #7
    All right. Thanks a lot!
     
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