Question about Texas Instruments TI-83 Plus Calculator

# "invalid dim" I am trying to type in a matrix. when I try to get the inverse of it, it gives me this message. I know I typed the problem in right.

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### kakima

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A matrix needs to be square--the number of rows must equal the number of columns.

Posted on Feb 17, 2010

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## Related Questions:

### What to do when error;invalid DIM shows up on the screen?

INVALID DIM error message may occur
if you are trying to graph a function that does
not involve the stat plot features. The error can
be corrected by turning off the stat plots. To
turn the stat plots off, press 2nd (stat plot) ,and
then select 4:PlotsOff.
â€¢ You specified a list dimension as something
other than an integer between 1 and 999.
â€¢ You specified a matrix dimension as something
other than an integer between 1 and 99.
â€¢ You attempted to invert a matrix that is not
square.

Sep 13, 2014 | Texas Instruments TI-84 Plus Calculator

### How to fix INVALID DIM in plotting graph

The ERR:INVALID DIM error message may occur
if you are trying to graph a function that does
not involve the stat plot features. The error can
be corrected by turning off the stat plots. To
turn the stat plots off, press y ,and
then select 4:PlotsOff.
â€¢ You specified a list dimension as something
other than an integer between 1 and 999.
â€¢ You specified a matrix dimension as something
other than an integer between 1 and 99.
â€¢ You attempted to invert a matrix that is not
square.

Apr 05, 2014 | Texas Instruments TI-84 Plus Calculator

### How do i find the inverse of a matrix on a CASIO fx-9750GII

Once the matrix is created you can use the reciprocal key to get the inverse.
I hope you will not hold against me if I showed the whole porocess. (No reflexion on your or anybody's abilities to create a matrix. Just trying to be helpful to more people.)

Press 1 or use Arrows to highlight Run/Mat.Press EXE

Press the F1 key to activate the Mat TAB.

While a matrix label is higlighted press F3:Dim to enter the dimensions.
Matrix must be square.

Fill her up!

Press EXE after entering the last element.
In Run/Mat screen press the OPTN key. Press F1 to enter the Mat identifier
followed by [ALPHA] A (if the matrix you created is stored in A)
At this point the screen displays Mat A.

Any of the continuations of the command shown below will yield the inverse matrix.
The minus sign you see in the 2nd and 3rd commands below is the change sign (-)

For the bogus 2X2 matrix I entered, the result is as follows.

Notice that even if inside the answer matrix the elements are displayed as decimals, the
values you will see at the bottom are exact fractions.

Aug 26, 2011 | Casio FX9750GII Graphic Calculator

### How can i calcute inverse of a 3*3 matrix with my casio cfx 9850gb?

First you have to create it.
Press the [MAT] icon to open the Matrix editor.
(The screen captures below may not look exactly as on your calculator but they are correct.)

On line Mat A use the right arrow to enter one dimension. Press EXE.
Enter the second dimension and press EXE. See screen captures

Enter the coefficients, pressing EXE each time to validate.

Once you finish entering the coefficients, press the menu key to exit the editor.
select [RUN] and press EXE.
In RUN screen press [OPTN], then [F2:Mat] (See screen capture)

The following screen is displayed. (Ignore the command Del Mat A, I used it to verify that the matrix has a non-zero determinant.)
Press [F1: Mat] to type the MAT identifier.
Press [ALPHA] A to type in the name of the matrix (here it is A.)

To calculate the inverse you must use the sequence [SHIFT] [ ) ] to activate (x^-1).

Both commands (Mat A)^-1 and Mat A^-1 on the preceding screen give the same result, the inverse of A. An here it is.

Once you enter the command press EXE, the calculator says DONE and displays the result

Jun 25, 2011 | Casio CFX 9850GB Plus Calculator

### When i try to create an inverse matrix it says i have invalid dim

Hi Robert9004x2,

If you want to examine the matrix you want to inverse and, the one that is given you trouble pressing [2nd] [MATRX]. Then stroll and, select the one you want to look at by pressing, [ENTER]. You'll have to press, [ENTER] again and, matrix should display at the Home screen. At the Home when you get to them your looking for the ones that are not square, like 2 by2 or 4 by 4 etc. You might need to re-edit this matrix so, that it is square.

Your trying to invert a matrix that isn't square you might be using using the proper key sequence to create a inverse matrix. Here what the correct inverse matrix look on the Ti 84 Plus Home screen.

And pictured below is a Matrix is being inverted by using the ^ and the -1 keys. Which to inverse a Matrix on the Ti 84 Plus you have to use the [x^-1] key.

This is not the proper way to inverse a Matrix on the Ti 84 Plus. The proper way to inverse of a matrix, the [x-1] key must be used, instead of pressing the sequence [^][-][1]. The [x-1] key is the official inverse key and is located right under the Math key. It is also the same key that you use to get to the matrix menus. The [^][-][1] sequence is only raising the matrix to the -1 power and, will cause an error too. If you need any more help, just post a comment and, I'll respond quickly.

Jan 18, 2011 | Texas Instruments TI-84 Plus Calculator

### Every time I try to graph on TI 84 it says ERR: INVALID DIM 1:QUIT I have enterered something simple y= x+2 and window is set for -10&lt;x&lt;10 and -10&lt;y&lt;10 the curser in y=...

INVALID DIM â€¢ The ERR:INVALID DIM error message may occur if you are trying to graph a function that does not involve the stat plot features. The error can be corrected by turning off the stat plots. To turn the stat plots off, press y , and then select 4:PlotsOff. â€¢ You specified a list dimension as something other than an integer between 1 and 999. â€¢ You specified a matrix dimension as something other than an integer between 1 and 99. â€¢ You attempted to invert a matrix that is not square.

Nov 11, 2010 | Texas Instruments TI-84 Plus Calculator

### I need to enter a 3 x 3 matrix. It is 4 columns and 3 rows. How do I enter it in the TI-83 +?

1. Press [2nd] [X to -1] under [MATH[ to access the (Matrix) menus.
2. Use right arrow to highlight [EDIT]
3. Press [1:A] to edit (create from scratch) the A matrix.
4. On the line MATRIX[A] line cursor blinks on 1
5. Enter m dimension (3) and press [ENTER].
6. Cursor moves to the second dimension (n). type 3.
7. Press [ENTER].
8. A 3x3 matrix template is displayed with A_11 element highlighted.
9. Replace the value 0 with your value for A_11.
10. Press [ENTER].
11. Type a value and press [ENTER].
12. When finished, press [2nd][QUIT] to exit the matrix editor.
Your matrix is ready to be operated on (squaring, multiplication by a scalar, inverse if matrix is non-singular, determinant.) All operations are available under [2nd][X^-1](Matrix) [=>][MATH].

Feb 03, 2010 | Texas Instruments TI-83 Plus Calculator

### Trying to get the inverse of a matrix

Hello,

The error may be due to the key you used to signifie inverse. It says in the manual that you should use the key x^-1 not the one used to input general powers.
Here is screen capture from the Appendix to the manual. The picture shows the sequence of keys to press to obtain the inverse of a 2x2 matrix. It is taken from page 41 of Appendix

The matrix used in the exemple is
a_11=2 a_12=1 a_21=1 a_22=2

http://support.casio.com/manualfile.php?rgn=1&cid=004001004

Hope it helps

Jul 13, 2009 | Casio FX-115ES Scientific Calculator

### Error: Invalid Dim

this happened to me as well. i looked it up and heres what i found:
http://www.prenhall.com/divisions/esm/app/graphing/ti83/faq/faq.html

basically you have a stat plot on so to turn it off, press 2nd and then the Y= button to get to "Stat Plot"
one of them is turned on so press enter and select OFF. this should fix the problem!

Sep 18, 2007 | Texas Instruments TI-83 Plus Calculator

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