Question about Texas Instruments TI-84 Plus Calculator

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Posted on Jan 02, 2017

SOURCE: 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)

Posted on Sep 05, 2009

SOURCE: I am trying to graph an equation and the following

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.

Posted on Feb 07, 2010

The most likely cause is that you attempted to reference a variable or use a function where it is not valid.

If you can't find the invalid reference, try posting the equation or function you're using.

If you can't find the invalid reference, try posting the equation or function you're using.

Jan 20, 2012 | Texas Instruments Office Equipment &...

Try erasing all the lists or resetting the RAM to defaults.

Press [2nd][+] to enter memory management.

Press the number to the left of option ClearAllLists.

Press ENTER to execute the command.

Press [2nd][+] to enter memory management.

Press the number to the left of option ClearAllLists.

Press ENTER to execute the command.

Sep 20, 2011 | Texas Instruments TI-84 Plus Calculator

Sep 12, 2011 | Texas Instruments TI-86 Calculator

The error data type means that the program is expecting a specific type of data ( number, list, matrix, real, complex, string, etc.) while you are feeding it some other type of data. The point in the program where you are taken when the error occurs is where the exception was launched.

A common source of error stems from the use of variables that are global and defined in some other program. You can use the same name inside your program as long as you declare the variable local.

If your program is in fact a function, then all its argument must be passed in the call to the function: You cannot ask a function to read your input.

I will not pretend to know why you get the error, but the few comments I made above may help you debug the program.

By the way, if you are interested a Cobebrook online calculator, here is a link

A common source of error stems from the use of variables that are global and defined in some other program. You can use the same name inside your program as long as you declare the variable local.

If your program is in fact a function, then all its argument must be passed in the call to the function: You cannot ask a function to read your input.

I will not pretend to know why you get the error, but the few comments I made above may help you debug the program.

By the way, if you are interested a Cobebrook online calculator, here is a link

Apr 26, 2011 | Texas Instruments TI-89 Calculator

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.

Dec 04, 2010 | Texas Instruments TI-83 Plus Calculator

First lets make sure you have a manual. go to:
http://ec1.images-amazon.com/media/i3d/01/A/man-migrate/MANUAL000010670.pdf
Go to chapter 3 and it explains the details in graphing

Aug 10, 2010 | Texas Instruments TI-83 Plus Calculator

There are a few routines to solve simultaneous LINEAR equations that are embedded in the Operating system of the calculator.

If you need download and install instructions, you will find them here.

- solve(
- Simult(

If you need download and install instructions, you will find them here.

Aug 01, 2010 | Texas Instruments TI-89 Calculator

Go to Window and make sure there are acceptable values for your graph, default is usually 10 and -10 with 1 scale.

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

Your Solver is a numerical solver not a symbolic one. You have to supply an initial guess at a solution and the Solver finds it. If you suspect, or know, that there are others jut run the solver again supplying the initial guess for each additional solution.

One easy way to locate the roots of an equation is to draw the function (without =0) and see on the graph the approximate values of x where the function vanishes. These approximate values of the roots can be used as initial guesses in the Solver.

One easy way to locate the roots of an equation is to draw the function (without =0) and see on the graph the approximate values of x where the function vanishes. These approximate values of the roots can be used as initial guesses in the Solver.

Nov 20, 2008 | Casio FX-9750GPlus Calculator

try a simple equation like x^2-1 which should come out with x = 1,-1

no sign change would indicate that the graph of the curve never crosses the x axis, if you graphed the above equation and calculated the zeros, it would come out with -1, 1 which it should, but if you put in x^2+1, the graph would never cross and therefore have no sign change from pos to neg or vice versa, the left-rt are the left and right bounds or the lower and upper bounds which was corrected in later calculators, Please let me know the outcome of graphing both of the above equations and then putting them in the solver. you could also use the quadratic equation to prove the answers if you liked, hope this helps

no sign change would indicate that the graph of the curve never crosses the x axis, if you graphed the above equation and calculated the zeros, it would come out with -1, 1 which it should, but if you put in x^2+1, the graph would never cross and therefore have no sign change from pos to neg or vice versa, the left-rt are the left and right bounds or the lower and upper bounds which was corrected in later calculators, Please let me know the outcome of graphing both of the above equations and then putting them in the solver. you could also use the quadratic equation to prove the answers if you liked, hope this helps

Mar 13, 2008 | Texas Instruments TI-83 Plus Calculator

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