Question about Texas Instruments TI-89 Calculator

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Undefined variable error

M calculus teacher told me that I needed to disable plots. I did a statistics problem involving plots. And I have cleared the plots. However, now, when I enter a function in the y=editor an error appears. It says error, undefined variable. I hit enter. Then home screnn comes up and asks me to define it.

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  • Anonymous Feb 21, 2009

    I am trying to graph x^2 and it is giveing me an error message that states undefined variable.

  • prashantdesa Mar 20, 2009

    but the answer you provided still does not work. It displays an error"syntax" and does not plot the graph.

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  • Contributor
  • 16 Answers

Goto home and type Define x

Posted on Jul 09, 2008

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1 Answer

Why can't i see the plotted points when i try to graph my L1 in a scatter-plot?


You cannot have a scatter plot with just one variable. You need values in L1 and values in L2. If you have only one set of values you can do 1-var statistics and plot a histogram (x-value vs. frequency).

Oct 06, 2013 | Texas Instruments TI-84 Plus Silver...

1 Answer

Error: Invalid


You're probably trying to graph a function that does not involve stat plot features. You can correct this by turning off the stat plot features. Press "2ND" "STAT PLOT" and then select 4:PlotsOff.

Mar 27, 2012 | Texas Instruments TI-84 Plus Calculator

1 Answer

I am trying to graph an equation, but the screen says undefined variable. On the y= screen I have 9 plots , with plot 1 listed as x:main\x y:main\y. The equation I entered was y1(x)=x^2-4 Please tell...


I''m glad you got this to work. For anyone else with this problem, in the y = page you can go to f5 and reset the settings, or you can highlight the plot 1 line and press [clear] this will not clear any other settings you may have inputted.

Mar 11, 2011 | Texas Instruments TI-89 Calculator

1 Answer

How to solye statistics problem


I have no clear idea what you mean by solve statistics problem. But if your problems involve finding the standard deviation and other statistical values then this post will help you.

The variance is the square of the standard variation

TO COMPUTE STANDARD DEVIATION AND 2-VAR STATISTICS.

I assume you know the theory. I will show you the key strokes

for 1-Var statistics
Press [MODE][3:STAT] [1:1-VAR]. You are ready to enter values in the X column.
Enter a number and press [=]. Cursor jumps to second number to enter.
Keep entering numbers and pressing [=] till all numbers are in. Press the [=] key after the last one.
Press [AC] key to clear the screen.
Press [SHIFT] [STAT] (above digit 1.) then [5:Var]. Screen displays the statistical variables 1:n ;2: x bar; 3: x sigma n; 4:x sigma n-1.
Press the number corresponding to the statistical value you want, ex 1:n . The variable appears on screen. Press [=] and it will be displayed.
To display another variable press [SHIFT][STAT][5:Var][ 1,2, 3, or 4] .

To access the sum of squares sigma x^2 and the sum of data sigma x press[SHIFT][STAT][4:SUM] then [1: for sigma x^2] or [2: for sigma x]. Press [SHIFT][STAT][6:MinMax] to access minX and maxX.

For 2-var statistics
To perform 2 variable statistics you press [MODE][3:STAT] and any of the other regression options (except 1:1-Var). A two column template opens where you enter the X and Y values. When finished entering data, press [SHIFT][STAT][5:Var]. to access the different statistics. As I assumed above, you should be able to recognize what each variable means.

Dec 22, 2010 | Casio FX-115ES Scientific Calculator

2 Answers

How do I clear things left in the stat plot window?


To clean the slate so to speak, just reset the RAM.
  1. Press [2nd][+] to access the (MEM)ory management function
  2. Press [7:Reset]
  3. Press [1:All Ram]
  4. Press [2:Reset]
  5. Press [CLEAR] to erase the "RAM cleared" Message

Calc

Aug 02, 2010 | Texas Instruments TI-83 Plus Calculator

2 Answers

Whenever i press the graph button on my ti-83plus i get an error message 'dim' it did not come with in depth directions & i am lost please help!


You're probably trying to graph a function that does not involve stat plot features. You can correct this by turning off the stat plot features. Press "2ND" "STAT PLOT" and then select 4:PlotsOff.

You caon download a guidebook from http://education.ti.com

Jul 21, 2010 | Texas Instruments TI-83 Plus Calculator

2 Answers

TI-83 Plus Calculator: I am trying to graph an equation and I get the "ER...


If the message appears when you try to graph functions deactivate the statistical plots. To do so:

Press [2nd][Y=] to access (STAT PLOTs)
Select [4:PlotsOff] then [ENTER]

That should solve your problem. Post a comment to this thread if you still have trouble graphing.

If the message appears in another context, it sure would help knowing the context of the error.

May 07, 2010 | Texas Instruments TI-83 Plus Calculator

2 Answers

Just bought this Ti-89 and I can't graph a Diff Eq. I followed the directions from the manual on page 69 and get an error: undefined variable


Even though implied multiplication is accepted generally by the calculator when it involves a number and variable, it leads to errors when it involves two sybmols,
xsin(x) is interpreted as a function called XSIN not X*SIN(X).
Suppose you have a function y1, function of t and you write ty1 the calculator will generate an undefined variable error: It reads ty1 as a variable.To prevent the error message you should write t*y1, showing the multiplication explicitly.
Similarly if you write y1'=0.001y1(100-t) the expression y1(100-t) is interpreted as a function call: the function y1 is called with argument 100-t. If it is what you want you should explicitly express the multiplication and wrtite y1'=0.001y1*(100-t).

Feb 01, 2010 | Texas Instruments TI-89 Calculator

1 Answer

When I try to graph a scatter plot from 2 lists, I get err: undefined


Hello,
Press [2nd][STAPLOTS][4:StatPlots Off] [ENTER][ENTER].
Press [STAT][5:SetUp Editor] [ENTER]ENTER]

Configure the statpolt as in the picture (for a scatter plot)
4859484.jpg
Restart you statistical graphing.
If that does not solve the problem, reset the RAM
Press [2nd][MEM][7:Reset][1:All Ram][2:Reset][ENTER], then [CLEAR] the message on screen.

Hope it helps.

Oct 06, 2009 | Texas Instruments TI-83 Plus Calculator

2 Answers

I cannot plot graph in my Ti 89 graphing calculator


That means one (or more) of the variables you have in your function is not defined. Check to make sure you didn't misspell any variable name. Also, check to make sure you didn't run two variable names together. "ab" is the variable ab, not a times b.

Mar 19, 2009 | Texas Instruments TI-84 Plus Calculator

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