Question about Texas Instruments TI-83 Plus Calculator

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Why do i get ERR: Undefined when i try to graph anything?

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  • briannebecke Jan 31, 2010

    If i put in the y= any kind of y=2x+1 and i make sure my window is standard size it looks like its going to graph...but then gives me the error. I havent used the graphing funcion on my calculator in years, so i guess i could be doing it wrong. I just want it to graph the line! Thanks!

  • kakima May 11, 2010

    You're referencing an undefined variable.

    How about posting an example?

  • k24674 May 11, 2010

    I tried all possible errors in graphing Y= functions and could not recreate the error condition. You must be trying to do some statistical graphs. Why not cut to the chase: tell us more about what you were trying to graph and maybe one of us will be able to help you.


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The easiest way to get you started is to reset the calculator RAM.
Press [2nd][MEM][7:Reset][1:All Ram][2:Reset] [ENTER]
If the Ram Cleared message is still displayed press the [CLEAR] button.

Open the Y= editor.
On the Y1= line, enter 2*[X,T,theta,n] +1. The [X,T,theta,n] key is just below [MODE] and to the lright of the [ALPHA] key.
Press [ENTER]
Verify that the = sign to the right of Y1 is still highlighted.
After you finish entering the function Y1, press [GRAPH].

Posted on Feb 01, 2010

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