TI-89 Titanium: Converting x Function to y Function

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Discussion Overview

The discussion revolves around how to graph functions on the TI-89 Titanium calculator, specifically converting functions defined in terms of x to those defined in terms of y. Participants explore the challenges of graphing equations like x = y^2 and the implications of using parametric mode for such conversions.

Discussion Character

  • Technical explanation
  • Debate/contested
  • Homework-related

Main Points Raised

  • One participant expresses frustration with the inability to graph functions defined as y in the Y= Editor, noting that converting x functions to y functions is insufficient for certain equations.
  • Another participant suggests using parametric mode, proposing the equations xt1 = t^2 and yt1 = t to graph the function, along with specific window settings for the graph.
  • Some participants challenge the effectiveness of the proposed method, stating that it only graphs half of the parabola and does not account for negative y values.
  • A later reply confirms that the suggested method produces a full parabola on their calculator, leading to confusion about the discrepancy in results.
  • Participants discuss the necessity of adjusting the minimum and maximum values in the WINDOW settings when changing graphs, indicating that it may vary based on the specific graph being plotted.

Areas of Agreement / Disagreement

The discussion contains multiple competing views regarding the effectiveness of the proposed graphing method, with some participants asserting it works while others maintain it does not yield the correct graph. The issue remains unresolved as participants have different experiences with the calculator's functionality.

Contextual Notes

Participants mention specific window settings and the importance of adjusting them, but there is no consensus on the necessity of these adjustments for every graph. The discussion also highlights the limitations of the calculator's graphing capabilities in certain scenarios.

apples
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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,
 
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apples said:
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,

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
 
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.
 
apples said:
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.

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?
 
Bingo!
Got it.
Thanks a lot!

Btw, Do I have to set the minimum and maximum values every time in the WINDOW?
 
apples said:
Btw, Do I have to set the minimum and maximum values every time in the WINDOW?

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.
 
All right. Thanks a lot!
 

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