Question about Texas Instruments TI-89 Graphing Calc Titanium

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.

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

Hope it helps.

Posted on Sep 14, 2009

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

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

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

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.

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

Jul 09, 2015 | Office Equipment & Supplies

Let us backtrack so as to better jump.

An algebraic expression may contain one or several**algebraic terms**, separated by a plus sign or a or a minus and a sign.

Each algebraic term is the product of a constant coefficient and a power of some variable, or the powers of several variables.

Example of an algebraic term 3(x^2)(y^6)....

**If the exponents of the various powers are positive integers, the term is called a monomial. **In short no square roots, or fractionary powers of the variables appear in monomials. Thus 2/x, 3SQRT(x), or 1/x^5 are not monomials.

Finally, a polynomial is an**algebraic expression** made up of one or more monomials.

Example P(X)=(1/3)X^7-(SQRT(5)*X^4+ 16X-25 is a polynomial of degree 7 in the indeterminate/variable X

Q(X,Y)= 3(X^3)*Y^2 + 4X-5Y+10 is a polynomial of degree 5 in the variables X and Y.

An algebraic expression may contain one or several

Each algebraic term is the product of a constant coefficient and a power of some variable, or the powers of several variables.

Example of an algebraic term 3(x^2)(y^6)....

Finally, a polynomial is an

Example P(X)=(1/3)X^7-(SQRT(5)*X^4+ 16X-25 is a polynomial of degree 7 in the indeterminate/variable X

Q(X,Y)= 3(X^3)*Y^2 + 4X-5Y+10 is a polynomial of degree 5 in the variables X and Y.

Oct 01, 2014 | Office Equipment & Supplies

its round has lots of squares and has a handle

Sep 11, 2013 | Texas Instruments TI-86 Calculator

The Calculator does not have a Computer Algebra System (CAS), and cannot perform algebraic operations with variables. However if you enter some expression with variables, it can solve for one unknown after it prompts you for the values of the others

Oct 05, 2012 | Casio Fx-991es Scientific Calculator

Mar 21, 2012 | Texas Instruments TI-89 Calculator

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.

Feb 07, 2011 | Texas Instruments TI-89 Calculator

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].**

Dec 12, 2010 | Texas Instruments TI-89 Calculator

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.

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.

Dec 02, 2009 | Texas Instruments TI-83 Plus Calculator

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.

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.

Sep 14, 2009 | Texas Instruments TI-89 Calculator

1. square of 12

2. cube root of 48 a raise to 5 y raise to 6

3. square root of 128 y raise to 5

4. 6th root of 9 y raise to 2

5. cube root of 24 y raise to 5

6. 10th root of 32 x raise to 5

7. 15th root of 64 x raise to 9

8. 4th root of 10000

9. cube root of 192 p raise to 5

10. cube root of 256 y raise to 12

2. cube root of 48 a raise to 5 y raise to 6

3. square root of 128 y raise to 5

4. 6th root of 9 y raise to 2

5. cube root of 24 y raise to 5

6. 10th root of 32 x raise to 5

7. 15th root of 64 x raise to 9

8. 4th root of 10000

9. cube root of 192 p raise to 5

10. cube root of 256 y raise to 12

Jul 04, 2008 | Texas Instruments TI-89 Calculator

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