Question about Texas Instruments TI-89 Graphing Calc Titanium

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Error: Non-algebraic variable in expression

I am attempting to perform a Chi-square 2-way test on my TI89 Titanium. However. after I input all the data into the matrix (named obs) and enter "obs" into the "observed mat" field, the calculator returns "Non-Algebraic variable in expression" Everyone else that I know does the same steps and their 89 works as intended. I have tried the following: resetting variables, clearing RAM, and clearing flash memory None of the above have fixed the issue. Thanks!

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Non-algebraic variable in expression: error 790
If a is the name of a PIC, GDB, MAC, FIG, etc., a+1 is invalid. Use a different variable name in the expression or delete the variable.

Posted on Dec 04, 2015

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Posted on Jan 02, 2017

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SOURCE: Differentiating and Integrating Problems

Hello,
This means that you are using a non-algebraic variable in an expression. I know, I am not even paraphrasing. Exemple: if you write 2 + johnQ, where johnQ is a table of data, a picture or a GDB, graphical data base object.

8d787a6.jpg Here is an exemple where mat is a 2X2 matrix and mot is a table.
Hope it helps.

Posted on Sep 14, 2009

onomou
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SOURCE: solving multiple non-linear equations

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.

Posted on Oct 04, 2009

  • 7993 Answers

SOURCE: TI 89 when solving equations or integrating a message appears:

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.

Posted on Apr 15, 2010

oneplusgh
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SOURCE: I reset the settings in my ti-89 titanium

If e is in the name of a PIC, GDB, MAC, FIG, etc, then e+1 is invalid. And you will get a error 790, Non-algebraic variable in expression. Use a different variable name in the expression or, go to the VAR-LINK screen and, find e. It is probably in a folder that you have been working in. Once your in VAR-LINK go down to the folder your working in and, open it up. Go down to e and see what else got called e. Highlight e and, if there is no symbol to the left of it, you can delete it. Press [F1] [1] [ENTER]. If it does have a symbol like a lock or, an asterisk then you have to unlock or unarchive it first before you can delete it. You can find those commands by pressing [F1] then press [7] or [9], respectively. Once it is unarchive or unlocked you can highlight it and, delete it with [F1] [1] [ENTER].

Posted on Jan 07, 2011

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What is factoring and give the examples


Quick-Start Guide When you enter an expression into the calculator, the calculator will simplify the expression by expanding multiplication and combining like terms. At this point the calculator will attempt to factor the expression by dividing a G C F, and identifying a difference between two squares, or factorable trinomials. Use the following rules to enter expressions into the calculator. Variables Any lowercase letter may be used as a variable. Exponents Exponents are supported on variables using the ^ (caret) symbol. For example, to express x 2, enter x ^ 2. Note: exponents must be positive integers, no negatives, decimals, or variables. Exponents may not currently be placed on numbers, brackets, or parentheses. Parentheses and Brackets Parentheses ( ) and brackets [ ] may be used to group terms as in a standard expression. Multiplication, Addition, and Subtraction For addition and subtraction, use the standard + and - symbols respectively. For multiplication, use the * symbol. A * symbol is optional when multiplying a number by a variable. For instance: 2 * x can also be entered as 2x. Similarly, 2 * ( x + 5 ) can also be entered as 2 ( x + 5 ) ; 2 x * ( 5 ) can be entered as 2 x ( 5 ). The * is also optional when multiplying parentheses, example: ( x + 1 ) ( x - 1 ). Order of Operations The calculator follows the standard order of operations taught by most algebra books - Parentheses, Exponents, Multiplication and Division, Addition and Subtraction. The only exception is that division is not currently supported; attempts to use the / symbol will result in an error. Division, Square Root, Radi cals, Fractions Division, square root, radi cals, and fractions are not supported at this time. A future release will add this functionality.

that's all I can say basically I learned it this way.

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Let us backtrack so as to better jump.
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Error:non-algebraic variable in expression


Non-algebraic variable in expression error may occur if a is the name of a PIC, GDB, MAC, FIG, etc., a+1 is invalid. Use a different variable name in the expression or delete the variable

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Im trying to use to use the factoring feature and it keeps coming up as error: non-algebraic variable in expression. What can I do to fix this so it will factor out the problem for me?


You probably stored something to the variable you are using in the expression. Go to 'Catalog', press 'D', find 'DelVar', and press enter to put it on the input bar. Then type the variable you are using after it and press enter to execute the command. Then try your factoring problem again. Or, just use a different variable.

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I reset the settings in my ti-89 titanium calculator and now when I use an e in a derivative the calc says: Error: non-algabraic variable in expression. How do I restore settings to allow for solving...


If e is in the name of a PIC, GDB, MAC, FIG, etc, then e+1 is invalid. And you will get a error 790, Non-algebraic variable in expression. Use a different variable name in the expression or, go to the VAR-LINK screen and, find e. It is probably in a folder that you have been working in. Once your in VAR-LINK go down to the folder your working in and, open it up. Go down to e and see what else got called e. Highlight e and, if there is no symbol to the left of it, you can delete it. Press [F1] [1] [ENTER]. If it does have a symbol like a lock or, an asterisk then you have to unlock or unarchive it first before you can delete it. You can find those commands by pressing [F1] then press [7] or [9], respectively. Once it is unarchive or unlocked you can highlight it and, delete it with [F1] [1] [ENTER].

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Hi,
If I understand correctly you want to perform matrix calculations on matrices the coefficients of which may be numbers and/or letters (variables, parameters). While you can calculate on numerical matrices, you cannot do so with matrices with non numerical coefficients. this calculator does not know symbolic algebra.

For symbolic algebra and calculus you would need a calculator with a CAS, Computer Algebra System. Exemples of those are the TI89, Ti92, Ti Voyage 200 PLT, The Casio FX-Algebra, the Casio ClassPad, HP48S/X/G/GX/G+, HP49G/49G+, HP50G, HP48GII etc.

Hope it Helps.
Thanks for using FixYa and for rating this solution.

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Differentiating and Integrating Problems


Hello,
This means that you are using a non-algebraic variable in an expression. I know, I am not even paraphrasing. Exemple: if you write 2 + johnQ, where johnQ is a table of data, a picture or a GDB, graphical data base object.

8d787a6.jpg Here is an exemple where mat is a 2X2 matrix and mot is a table.
Hope it helps.

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