Question about Texas Instruments TI-89 Calculator

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)

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

Posted on Feb 24, 2009

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Posted on Jan 02, 2017

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

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

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]

**Calculation**

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.**

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

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

Press [F1:Mat] echoes on screen as Mat; screen shows

Press [ALPHA] A The screen displays

Press [ENTER] to calculate the determinant.

Jan 03, 2011 | Casio FX-9750GPlus Calculator

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.

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

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(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.

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

When you press the OPTN key you see Tabs at the bottom of the screen. The second one from the left should be the submenu for matrix operations.. When you press F2:MAT, the new tabs are Mat, M>L (Matrix to List), Det (command to calculate the determinant etc.

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]

**Calculation**

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.**

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

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

Press [F1:Mat] echoes on screen as Mat; screen shows

Press [ALPHA] A The screen displays

Press [ENTER] to calculate the determinant.

Dec 13, 2010 | Casio FX-9750GPlus Calculator

When
you press the OPTN key you see Tabs at the bottom of the screen. The
second one from the left should be the submenu for matrix operations..
When you press F2:MAT, the new tabs are Mat, M>L (Matrix to List),
det (command to calculate the determinant etc.

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]

**Calculation**

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.**

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

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

Press [F1:Mat] echoes on screen as Mat; screen shows

Press [ALPHA] A The screen displays

Press [ENTER] to calculate the determinant.

Dec 13, 2010 | Casio FX-9750GPlus Calculator

Dec 06, 2010 | Texas Instruments TI-89 Calculator

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.

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

Press

Nov 17, 2010 | Casio FX9750GII Graphic Calculator

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

- Press [2nd][X^-1] to access the (MATRIX) menus.
- Use the right arrow key to move to the tab [EDIT]
- Under tab EDIT, press 1 to name the matrix as [A]
- A matrix template opens (default dimensions are 1x1)
- Change the dimensions to 4x4: Press digit 4 key and ENTER. Cursor move to 2nd dimension. Type in 4 and press [ENTER] to validate.
- The matrix template changes: screen shows a matrix, filled with 0.
- Enter the value of each coefficient and press [ENTER]. The cursor move to next coefficient.
- After you validate all values, press [2nd][MODE] to (QUIT) the matrix editor.

- In main calculator screen press [2nd][X^-1] to open the (MATRIX) functions.
- Use the right arrow once to highlight the [MATH] menu.
- Select [1:det(] and press [ENTER]
- The command det( echoes on main screen.
- Press [2nd][X^-1] to opent the (Matrix) menus again.
- Select the number in list that corresponds to your matrix (presumably 1:[A]) and press [ENTER]
- The command line shows det( [A]
- Complete the command by closing the parenthesis and pressing [ENTER]
- Wait for the result to be displayed.

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

- Press [2nd] [X to -1] under [MATH[ to access the (Matrix) menus.
- Use right arrow to highlight [EDIT]
- Press [1:A] to edit (create from scratch) the A matrix.
- On the line MATRIX[A] line cursor blinks on 1
- Enter m dimension (3) and press [ENTER].
- Cursor moves to the second dimension (n). type 3.
- Press [ENTER].
- A 3x3 matrix template is displayed with A_11 element highlighted.
- Replace the value 0 with your value for A_11.
- Press [ENTER].
- Type a value and press [ENTER].
- When finished, press [2nd][QUIT] to exit the matrix editor.

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

Hello,

I assume yoy 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]

**Calculation**

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.**

Hope it helps..

I assume yoy know how to define your matrix, but I will repeat it here for others who might not know. You can skip to

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

Press [F1:Mat] echoes on screen as Mat; screen shows

Press [ALPHA] A The screen displays

Press [ENTER] to calculate the determinant.

Hope it helps..

Oct 14, 2009 | Casio FX-9750GPlus Calculator

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