Question about Texas Instruments TI-89 Calculator

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Plz help hi i am trying to do a scatterplot on my TI 89.  I have 2 lists and i try to graph it and it says undefined variable. i typed define x at home.. and nothing happened. Please help me bec i need to know how to do this for a test soon

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Try not to set your first variable as zero
thats not a lot but thats what happened to me in my class

Posted on Aug 27, 2008

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You referenced a variable that is not currently defined. For example, you referenced a stat variable when there is no current calculation because a list has been edited, or you referenced a variable when the variable is not valid for the current calculation, such as a after Med-Med.

Jun 06, 2013 | Texas Instruments TI-83 Plus Calculator

1 Answer

I try to graph an absolute value on my Ti 89 and I put the inequality in right but when I go to graph it my calculator says undefined variable.


If you want to graph the absolute value of a function, feed the function to the absolute value ie graph y= abs(f(x)). The calculator will take care of it. See screen captures where I draw the function y1=x^3-5x^2-3 and y2='x^3-5x^2-3'. On the first graph the function is represented and on the second the function and its absolute value.

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The calculator knows how to calculate the absolute value of an expression. The name of the command is abs(

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May 08, 2011 | Texas Instruments TI-89 Calculator

2 Answers

I am trying to graph any possible equation and I get undefiend varialbe for any kind of equation as simple as x=7. It will always show as undefiend varialbe for any equation. I don't know why it does this.


Undefined variable error message displays when you evaluate a user-defined
function or run a user-defined program that references a local variable that is not
initialized (assigned a value). You have to type LineVert 7 and then graph function x=7. See captured image


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May 02, 2011 | Texas Instruments TI-89 Calculator

1 Answer

I keep getting undefined variable error when i try to graph


Hello,
The default variable for the integral is x. If you have a product between two litteral symbols the * must be inserted. Arguments of functions must be enclosed between parentheses. To avoid errors clear the variables before the integration: [2nd][F6:Clean Up] [2:NewProb][ENTER]ENTER]

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Hope it helps.


Sep 30, 2009 | Texas Instruments TI-89 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

2 Answers

I am trying to graph r=sqroot(sin2theta) on my ti-89 titanium in polar mode and it is telling me when i try to graph that there is an undefined variable. what do i do?


Did you still need help with this? My suspicion is a missing multiplication sign. Sometimes you need to be very explicit in what you want the calculator to do. Have you tried sqroot(sin(2*theta)) explicitly putting the multiplication symbol in there? I think 2theta is interpreted as it's own variable name...

Jan 11, 2009 | Texas Instruments TI-89 Calculator

6 Answers

Ti-89 gives error of "Undefined Variable"


You have to reset
• Press [2nd] [6] (MEM) [F1] [ENTER(RAM)]
• Select 1:ALL RAM
• Press [ENTER]
• Press [ENTER]
NOTE- erased half of my programs(I think only the ones in the main directory)

May 03, 2008 | Texas Instruments TI-89 Calculator

1 Answer

Undefined variable


go to home and type Define x

Apr 13, 2008 | Texas Instruments TI-89 Calculator

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