Question about Texas Instruments TI-89 Calculator

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Can't see all of a solution on homescreen

I am entering the matrix
[2,a,-1;3,4,-(a+1);10,8,(a-4)]^-1 on the input line but I can't see all of the answer on homescreen. The last row is partly visible behind the input line

Is there any way of scrolling down the homescreen or changing the resolution so I can see all the solution?

In anticipation for your help,
Jacqui Pitts ( WantirnaCollege, Australia)

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  • 35 Answers

Yes. Hit ↑ on the homescreen and scroll down with ↓.

Posted on Feb 24, 2009

  • redherring72 May 20, 2011

    supportthe85's solution does not work, because up and down only scrolls through solutions, and it'll only show the top of the matrix. The only solution I can find is to store the matrix as a variable, then view it in the Data/Matrix editor.



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1 Answer

How to enter matrix to the calculator

Turn calculator ON
Press the Mode key.
Select the Matrix Option
Select the name of the Matrix: MatA , MatB, or MatC
Choose the dimensions of the matrix (3X3, 3X2, ..2X1)
Calculator displays a template (empty spaces where you enter the matrix coefficients.
Type = after each element.
Press AC to exit the matrix editor.
Now you are ready to do (legal) operation on the matrix.
Available opeartions are found under SHIFT 4: Matrix.
To enter a matrix label on the command line (MatA, MatB, or MatC) you press SHIFT;4 (MATRIX), and select the label by pressing the relevant number in the list of options

Jan 24, 2012 | Casio FX-115ES Scientific Calculator

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My nokia 2700 req for security passwordi forgot password.any solution?

you can try the following solutions:
1. on your phone's homescreen enter these: *#2640# to Display the phone security code in use
2. if step 1 does not work, try this (MAKE SURE that you know your PUK, if not contact your service provider first and ask for the PUK), enter an incorrect pin until the phone prompts you to input the PUK, input the PUK you obtained from the service provider and your phone should be working properly

Apr 20, 2011 | Nokia Classic 2700 Cell Phone

1 Answer

How to multiply matrix on fx-991ES calculator?


Its very easy to do matrix operations in FX 991ES
This calculator can operate up to three Matrices at a time, namely Matrix A (Mat A), Matrix B (MAT B), Matrix C(MAT C).

  1. First to do, is set the calculator in MATRIX Mode
    Its Easy
    Press MODE button and press 6.
    Your Display will show indication of MAT on upper side of screen to show now calculator is in MATRIX Mode

  2. Now we need to Define matrices and set its dimensions.
    This product supports matrix of order up to 3x3. That is you can operate matrix of No. of rows=3 and No. of columns=3
    To input matrix, Press SHIFT and then 4. This will Pop up Menu for Matrix. Now press 1
    Your screen will show as this,
    MAT A will be your First Matrix and MAT B will be your Second Matrix and so on.
    Press 1 , 2 , or 3 to select Matrix A , B, or C.
    here I will Proceed with Matrix A, so I press Numerical 1 Key

  3. Next screen will ask you about the size of matrix.

    Press UP or DOWN Keys to view options.
    Press Corresponding Numerical keys to select corresponding order.

  4. On Next Screen , enter values on each positions
    Press UP, DOWN, LEFT, RIGHT Keys to move around in matrix and specify each element.

  5. Now we inputed Details about Matrix A. If you want to specify other matrices (MATRIX B, MATRIX C) repeat STEPS 2 To STEP 4

  6. After Specifying required Matrices, we can tell calculator to do operations with them.

    Press SHIFT and then 4 and then It will show a menu contains

  7. For example, i need to multiply Matrix A with Matrix B, i'll enter as

    SHIFT + 4 + 3 to Input Matrix A

    to enter operator (Here multiplication, You enter + - x / for corresponding arithmetic operations )

    SHIFT + 4 + 4 to Input Matrix B

    = To show Result
    Press UP DOWN LEFT RIGHT Keys to view extra fields, if any.

Hope this will help you.

have a good time with Casio FX 991ES

Mar 26, 2011 | Computers & Internet

1 Answer

How do I find the determinant of a matrix?

Here is a detailed account of how to calculate the determinant of a square matrix.

I assume you know how to define your matrix, but I will repeat it here for others who might not know. You can skip to Calculation
1.Turn Calculator ON. If there are no icons, press [MENU].

Data Entry

2.Use arrows to highlight [MAT] icon. Press [ENTER]
3.Highlight the first line where it says Mat A. Use the right arrow to enter the dimensions of Matrix A. Enter 3 and press [EXE]. The cursor moves to the second dimension. Press 3 and press [ENTER].
4. The matrix entry screen appears.
5. Enter first matrix coefficient a_11 and press [ENTER]
6. Enter a_12 and [ENTER]
Key in last coefficient a_33 and press [ENTER]

Press [MENU] and [RUN]
Press [OPTN][F2:MAT][F3:Det] Command echoes on screen as det
Press [F1:Mat] echoes on screen as Mat; screen shows det Mat
Press [ALPHA] A The screen displays det Mat A
Press [ENTER] to calculate the determinant.

If the matrix is not square, you cannot calculate its determinant.

Jan 03, 2011 | Casio FX-9750GPlus Calculator

4 Answers

In casio fx-991ES, i am able not to get the matrix multiplication as well as inverse when i do so get math error.

This post is rather exhaustive as regards the matrix capabilities of the calculator. So if the post recalls things you already know, please skip them. Matrix multiplication is at the end.

Let me explain how to create matrices. (If you know how to do it, skip to the operations on matrices, at the end.)

First you must set Matrix calculation
[MODE][6:Matrix]. Then By entering one of the numbers [1:MatA] or [2:Matb] or [3:MatC] you get to choose the dimensions of the matrix
(mxn]. Once finished entering the matrix you clear the screen.
The operations on matrices are available by pressing [Shift][Matrix]
[1:Dim] to change the dimension of a matrix (in fact redefining the matrix)
[2:Data] enter values in a matrix
[3:MatA] access Matrix A
[4:Matb] access Matrix B
[5:MatC] access matrix C
[6:MatAns] access the Answer Matrix (the last matrix calculated)
[7:det] Calculate the determinant of a matrix already defined
[8:Trn] The transpose of a matrix already defined

To add matrices MatA+MatB (MUST have identical dimensions same m and same n, m and n do not have to be the same)
To subtract MatA-MatB. (MUST have identical dimensions, see above)
To multiply MatAxMatB (See below for conditions on dimensions)
To raise a matrix to a power 2 [x2], cube [x3]
To obtain inverse of a SQUARE MatA already defined MatA[x-1]. The key [x-1] is the x to the power -1 key. If the determinant of a matrix is zero, the matrix is singular and its inverse does not exit.

Dimensions of matrices involved in operations must match. Here is a short summary

The multiplication of structured mathematical entities (vectors, complex numbers, matrices, etc.) is different from the multiplication of unstructured (scalar) mathematical entities (regular numbers). As you well know matrix multiplication is not commutative> This has to do with the dimensions.

An mXn matrix has m rows and n columns. To perform multiplication of an kXl matrix by an mXn matrix you multiply each element in one row of the first matrix by a specific element in a column of the second matrix. This imposes a condition, namely that the number of columns of the first matrix be equal to the number of rows of the second.
Thus, to be able to multiply a kXl matrix by am mXn matrix, the number of columns of the first (l) must be equal to the number of rows of the second (m).

So MatA(kXl) * MatB(mXn) is possible only if l=m
MatA(kX3) * Mat(3Xn) is possible and meaningful, but
Mat(kX3) * Mat(nX3) may not be possible.

To get back to your calculation, make sure that the number of columns of the first matrix is equal to the number of rows of the second. If this condition is not satisfied, the calculator returns a dimension error. The order of the matrices in the multiplication is, shall we say, vital.

Dec 18, 2010 | Casio FX-115ES Scientific Calculator

1 Answer

How do i convert a decimal answer to fraction format on a TI 89 titanium.... prefferably with matrixes

It is just a matter of being in EXACT mode. To set your calculator in EXACT mode here's the key sequence. Press [MODE] [F3] [Up Arrow] [Up Arrow] [Right Arrow] [2] [ENTER]. Now when your in the Matrix Editor you can input your numbers in decimal form and, they will be automatically be converted to a fractional format. Pictured below is a matrix that was entered using decimal numbers and, was converted into factional form. Notice at the bottom of the screen the calculator is in EXACT mode.

Here's the same matrix in the HOME screen.

Next is the same matrix converted back to decimal numbers. Notice at the bottom of the screen the calculator is in APPROX mode.

And of course when I turn the calculator back to EXACT mode and, Re-ENTER the decimal formatted matrix in the HOME screen the fractional formatted matrix reappears.
You can use the propFrac( command but, having in the EXACT mode setting works better.

Dec 06, 2010 | Texas Instruments TI-89 Calculator

1 Answer

How do i find the inverse of a 3x3 matrix on my Casio FX9750GII calculator? thanks

Create the Matrix in the Run/Mat screen

Press 1 to enter Run/Matrix screen

Press F1 >MAT. The next screen opens. Enter the dimensions (3x3)

In the template enter the coefficients. Press EXE after each item.

Press the AC button to exit thye matrix editor screen.

Press SHIFT 2 to type the Mat identifier on the command line.
Press the ALPHA key followed by A (if you are working with the A matrix.)
At this point you have Mat A on the command line.
Press SHIFT ) to get the x^-1 function. That is the one that calculates the inverse of a Matrix.


Nov 17, 2010 | Casio FX9750GII Graphic Calculator

1 Answer

How do get the determinant from a 4 x 4 matrix

To create the matrix (in case you do not know.)

  1. Press [2nd][X^-1] to access the (MATRIX) menus.
  2. Use the right arrow key to move to the tab [EDIT]
  3. Under tab EDIT, press 1 to name the matrix as [A]
  4. A matrix template opens (default dimensions are 1x1)
  5. Change the dimensions to 4x4: Press digit 4 key and ENTER. Cursor move to 2nd dimension. Type in 4 and press [ENTER] to validate.
  6. The matrix template changes: screen shows a matrix, filled with 0.
  7. Enter the value of each coefficient and press [ENTER]. The cursor move to next coefficient.
  8. After you validate all values, press [2nd][MODE] to (QUIT) the matrix editor.
To calculate the determinant of a matrix that is already defined.
  1. In main calculator screen press [2nd][X^-1] to open the (MATRIX) functions.
  2. Use the right arrow once to highlight the [MATH] menu.
  3. Select [1:det(] and press [ENTER]
  4. The command det( echoes on main screen.
  5. Press [2nd][X^-1] to opent the (Matrix) menus again.
  6. Select the number in list that corresponds to your matrix (presumably 1:[A]) and press [ENTER]
  7. The command line shows det( [A]
  8. Complete the command by closing the parenthesis and pressing [ENTER]
  9. Wait for the result to be displayed.

Nov 01, 2010 | Texas Instruments TI-83 Plus Calculator

1 Answer

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

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