Question about Texas Instruments TI-89 Calculator

Hello,

Clear the contents of variables. Somme variable of letter you are using contains an object incompatible with the arguments of the expand( function ; a matrix, a list, a reserved system variable.

Clear the calculator of old junk by resetting the RAM or executing the NewProb command, either from the keyboard or by pressing [Diamond][HOME][2nd][F6:CleanUp][2:NewProb][ENTER].

Here is a screan capture.

Hope it helps.

Posted on Oct 06, 2009

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Posted on Jan 02, 2017

In parametric functions, the variables x and y are both functions of an independent variable, **called t,** and that usually represents the time. The default variable in parametric functions must be called t. You can enter the limits you want. However if you type in 2 Pi it will be converted on the entry line to 6.28. The default tstep is 0.13 which is about pi/24. I fail to see what the commotion is about.

In this representation of the witch of Agnesi, the variable t is between 0 and 4Pi, and the step tstep is 0.13, a little less that pi/24

Reset your calculator and restart

In this representation of the witch of Agnesi, the variable t is between 0 and 4Pi, and the step tstep is 0.13, a little less that pi/24

Reset your calculator and restart

Mar 14, 2014 | Texas Instruments TI-Nspire Graphing...

Sep 12, 2011 | Texas Instruments TI-86 Calculator

it sounds like your hitting the secondary key button and just putting in letters you should use x on variables button substitute other letters your using for x (sorry i couldn't make this much clearer)

Jan 17, 2011 | Texas Instruments TI-89 Calculator

With the ALPHA keyboard, Type in the NewProb command and press ]ENTER] It resets the one-letter variables to their default status.

Alternatively, you can use the CATALOG of commands to launch the NewProb command.

Another way is

In HOME directory, press the [2nd][F1] to activate the F6 key. In the menu list, press 1:Clear a-z and ]ENTER].

If you have to use the variable x multiplied by a function (sin, cos, tan, log, etc) do not used implied multiplication: enter the [*] explicitly.

Alternatively, you can use the CATALOG of commands to launch the NewProb command.

Another way is

In HOME directory, press the [2nd][F1] to activate the F6 key. In the menu list, press 1:Clear a-z and ]ENTER].

If you have to use the variable x multiplied by a function (sin, cos, tan, log, etc) do not used implied multiplication: enter the [*] explicitly.

Apr 14, 2010 | Texas Instruments TI-89 Calculator

From a lack of a response I'm assuming this is no longer a problem. If it is still a problem, please post a comment specifying the error message.

Feb 17, 2010 | Texas Instruments TI-83 Plus Calculator

You have some numerical value stored in the variable x, which the calculator is plugging into the resultant equation.

You can clear individual variables with 2ND [VAR-LINK]. You can clear all one-character variables a-z with 2ND [F6] 1. You can initialize the machine for a new problem with 2ND [F6] 2.

You can clear individual variables with 2ND [VAR-LINK]. You can clear all one-character variables a-z with 2ND [F6] 1. You can initialize the machine for a new problem with 2ND [F6] 2.

Feb 10, 2010 | Texas Instruments TI-89 Calculator

To enter this equation on a TI89Titanium is rather trivial: You use the keyboard and the [ALPHA] key to enter the variable (or unknown) n.

The question I am asking you is this: "What do you intend to do with the equation once it is entered?"

As you can see on the screen capture I am enclosing, if you just want to enter it and if n does contain a value already, all the calculator will do is to echo the command without modification. Obviously this is not what you want.

The screen capture shows you two other commands you can use solve( and expand (.

That should answer your question concerning how to enter the equation (look at the command line) and maybe help you decide what you want to do with the equation once it is entered.

The question I am asking you is this: "What do you intend to do with the equation once it is entered?"

As you can see on the screen capture I am enclosing, if you just want to enter it and if n does contain a value already, all the calculator will do is to echo the command without modification. Obviously this is not what you want.

The screen capture shows you two other commands you can use solve( and expand (.

That should answer your question concerning how to enter the equation (look at the command line) and maybe help you decide what you want to do with the equation once it is entered.

Jan 25, 2010 | Texas Instruments TI-84 Plus Calculator

I am not quite sure what you are asking...

(1) if asking for graphing y= -2/3x+2, then press [diamond] [F1: Y=] type in .2/3x +2, see graph by [diamond][graph]

(2) if asking for graphing y= -2/3x+a, where a=3x, then first archive a=3x in Home screen by [home], type 3x [sto] a, then go back to y= menu, and type -2/3x+a in Y1

(3) if asking for graphing an equation that is dependent on 2 variables at the same time, use x-y-z axis (aka, change mode to graphing 3-D by [mode]graph [5:3D]) then enter desired equation in y= menu using Z function in terms of x and y aka z(x,y)= ...)

(1) if asking for graphing y= -2/3x+2, then press [diamond] [F1: Y=] type in .2/3x +2, see graph by [diamond][graph]

(2) if asking for graphing y= -2/3x+a, where a=3x, then first archive a=3x in Home screen by [home], type 3x [sto] a, then go back to y= menu, and type -2/3x+a in Y1

(3) if asking for graphing an equation that is dependent on 2 variables at the same time, use x-y-z axis (aka, change mode to graphing 3-D by [mode]graph [5:3D]) then enter desired equation in y= menu using Z function in terms of x and y aka z(x,y)= ...)

May 18, 2008 | Texas Instruments TI-89 Calculator

Type it like this: solve( equation1 and equation2 and moreEquations, {list of variables to solve for})

Put all of your equations right after the opening parenthesis separated by the word*and*, then a comma, then within curly braces each variable you want to solve for each separated by a comma.

Put all of your equations right after the opening parenthesis separated by the word

Apr 26, 2008 | Texas Instruments TI-89 Calculator

On the home screen, go to F6 ([2nd] [F1]) and then press [2] (NewProb). It should fix the problem.

Feb 15, 2007 | Texas Instruments TI-89 Calculator

May 21, 2014 | Texas Instruments TI-89 Calculator

Feb 17, 2014 | Texas Instruments TI-89 Calculator

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