Question about Texas Instruments TI-89 Graphing Calc Titanium

# 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

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.

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

Posted on Sep 14, 2009

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

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

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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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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### 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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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.

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

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