Question about Texas Instruments TI-89 Calculator

# Every time I plug in lim(x^2+y^2,{x,y}{2,3}) it gives me an error "Argument must be a variable name". Is this the correct way of entering it?

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You have to download the next program for multivariable function limit from:
http://www.technicalc.org/fpw/lim.html
See captured image below

Posted on Aug 08, 2013

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Posted on Jan 02, 2017

SOURCE: argument errors

x-2y=8

Posted on May 29, 2008

SOURCE: TI 89: Argument Error.

I reset the calculator and it did its job- though a solution would be handy.

Posted on Sep 14, 2008

Perhaps you have some data stored in the x variable.

With the calculator on, press [2nd] then the minus button. This brings up a list of all the saved data in the calculator. Look through the far left column of the list for x.

If you find x in the list, highlight x, then press F1, and then select delete.

Now it should work like normal.

Posted on Nov 07, 2009

Make sure the first argument is a number between 0 and 1, inclusive. Make sure the second argument is an integer or a list of integers.

Posted on May 10, 2010

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## Related Questions:

### Graphing calculator argument error

The function you give as example in the additional information to your duplicate post is too simple to generate an Argument error. Maybe a syntax error but not an argument error.
Check what you enter on the line that defines the function. Do not confuse the minus sign - (for subtraction) and the change sign (negation sign) marked (-).
You can also reset your calculator by pressing the button on the back.

Mar 09, 2014 | Office Equipment & Supplies

### My MS Excel vlookup function ASCII type table contains both upper case and lower case letters, characters like ( and % or *, and numbers. It seems to return the numerical equivalent of upper case letters...

Correct a #N/A error Show All Hide All This error occurs when a value is not available to a function or formula.
1. Optionally, click the cell that displays the error, click the button that appears , and then click Show Calculation Steps if it appears.
2. Review the following possible causes and solutions. Missing data, and #N/A or NA() has been entered in its place
Replace #N/A with new data.
Note You can enter #N/A in those cells where data is not yet available. Formulas that refer to those cells will then return #N/A instead of attempting to calculate a value.
Giving an inappropriate value for the lookup_value argument in the HLOOKUP, LOOKUP, MATCH, or VLOOKUP worksheet function
Make sure that the lookup_value argument (argument: The values that a function uses to perform operations or calculations. The type of argument a function uses is specific to the function. Common arguments that are used within functions include numbers, text, cell references, and names.) is the correct type of value — for example, a value or a cell reference, but not a range reference. Using the VLOOKUP, HLOOKUP, or MATCH worksheet function to locate a value in an unsorted table
By default, functions that look up information in tables must be sorted in ascending order. However, the VLOOKUP and HLOOKUP worksheet functions contain a range_lookup argument (argument: The values that a function uses to perform operations or calculations. The type of argument a function uses is specific to the function. Common arguments that are used within functions include numbers, text, cell references, and names.) that instructs the function to find an exact match even if the table is not sorted. To find an exact match, set the range_lookup argument to FALSE. The MATCH worksheet function contains a match_type argument that specifies the order the list must be sorted in to find a match. If the function cannot find a match, try changing the match_type argument. To find an exact match, set the match_type argument to 0.
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If the array formula (array formula: A formula that performs multiple calculations on one or more sets of values, and then returns either a single result or multiple results. Array formulas are enclosed between braces { } and are entered by pressing CTRL+SHIFT+ENTER.) has been entered into multiple cells, make sure that the ranges referenced by the formula have the same number of rows and columns, or enter the array formula into fewer cells. For example, if the array formula has been entered into a range 15 rows high (C1:C15) and the formula refers to a range 10 rows high (A1:A10), the range C11:C15 will display #N/A. To correct this error, enter the formula into a smaller range (for example, C1:C10), or change the range to which the formula refers to the same number of rows (for example, A1:A15).
Omitting one or more required arguments from a built-in or custom worksheet function
Enter all arguments (argument: The values that a function uses to perform operations or calculations. The type of argument a function uses is specific to the function. Common arguments that are used within functions include numbers, text, cell references, and names.) in the function.
Using a custom worksheet function that is not available
Make sure that the workbook that contains the worksheet function is open and the function is working properly.
Running a macro that enters a function that returns #N/A
Make sure that the arguments (argument: The values that a function uses to perform operations or calculations. The type of argument a function uses is specific to the function. Common arguments that are used within functions include numbers, text, cell references, and names.) in the function are correct and in the correct position.

Oct 31, 2008 | Computers & Internet

### Argument checking!

The calculator does have several error message concerning the argument. For the Request( command the syntax is
Request(Message, VarName)
What you type is stored as a string. It is only after you try to convert it to a value that the calculator looks at its content.
Here is an example where the variable VarName is x
Request ("Variable x", x)
I enter a complex number, manipulate it mildly with no apparent problem. However when I try to convert it to a numerical expression, and store it in the variable x, y, theta, I get a message Error non-real result.

Jan 13, 2014 | Texas Instruments Voyage 200 Calculator

### Hey I am trying to use the DeSolve funtion on Texas TI-nspire cas. I insert: DeSolve(2x=0, x) and I get a error message. What am i doing wrong

deSolve( ) solves differential equations. The general syntax is deSolve(1stOR2ndOrderODE, Var, depVar). The first argument must be a first order or second order differential equation, the second argument is the independent variable, and the third is the dependent variable (the name of the function you are trying to obtain.)
Your command does not have a differential equation, and it does not have the dependent variable.

Sep 18, 2011 | Texas Instruments TI-89 Calculator

### Argument error whenever I type equations with variables.

Perhaps you have some data stored in the x variable.

With the calculator on, press [2nd] then the minus button. This brings up a list of all the saved data in the calculator. Look through the far left column of the list for x.

If you find x in the list, highlight x, then press F1, and then select delete.

Now it should work like normal.

Oct 22, 2009 | Texas Instruments TI-89 Calculator

### How do enter a lim of function when from one side using nderiv

Hello,
nDeriv( is valid only for real variables.
The syntax is as follows:
nDeriv ( expression, variable, value, epsilon)

expression: the function the derivative of which you want to calculate
variable: the name of the variable in the expression above (usually x)
value: the numerical value of the e x where you evaluate the derivative
epsilon: the numerical value of the tolerance. Default is 1x10^(-3). But you can change it to a smaller value to obtain a more precise result.

To use default value of epsilon
nDeriv ( expression, variable, value)

To use a different epsilon, ex 1x10^(-4)
nDeriv ( expression, variable, value, 0.0001)

nDeriv( A^3 , A, 5., 0.0001) should give you 75

Hope it helps.

Oct 21, 2009 | Texas Instruments TI-84 Plus Calculator

### Hi so i have to use the cos, sin , and tan functions on my ti-89 but when i press enter it says "Error: protected memory violation"... i need to use those keys for a precalc test tomorrow and i dont know...

Hello,
My guess is that you entered as variable of the the functions, the name of a variable that is reserved (system variable, app variable ). In Home screen press [F6: Clean up][ Clear a-z] [ENTER] and stick with x as function argument.
Hope it helps.

Oct 02, 2009 | Texas Instruments TI-89 Calculator

### I am trying to find the integral to x*sinx on my ti-89 but everytime I get an argument error message. Is there a different x button other than the obvious big white x button?

Hello,
Here is a screen capture of the integral.

The dummy variable x may contain some previously defined value. Clear old values . In Home folder [2nd][F6: Clean Up][ 1:Clear a-z] [ENTER][ENTER] or [2:NewProb][ENTER][ENTER]
Make sure you insert the multiplication sign. And do not forget to put the argument x of the function inside parentheses.
Hope it helps.

Sep 30, 2009 | Texas Instruments TI-89 Calculator

### Error:syntax when I try to graph

Hello,
I am no seer, nor will I try to guess what may have happened. This error may come from various conditions
1. The most common reason is an omitted right parenthesis. For instance you press the [sin] function key. It shows as sin( , notice the right parenthesis. You enter the variable, say X, and you press [ENTER]. The calculator gives you a syntax error: It does not know what to do as long as you do not insert the closing parenthesis.
2. Another common source of this error message is the use of the regular MINUS sign instead of the (-). The latter appears on the scren as a smaller, raised minus sign. This is especially true when you want to raise a number or a variable to a negative exponent.

Every function has one way it takes in its food (argument). If you don't do it the right way, it gives you an error. The nice thing is that the calculator gives you the opportunity to correct the error. Whenever you see Error 1:quit 2: Go to, choose GO TO because the calculator shows you exactly the symbol that is creating havoc: It will be highlighted.

Hope it helps.

Sep 15, 2009 | Texas Instruments TI-83 Plus Calculator

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