Question about Texas Instruments TI-89 Calculator

# Problem entering matrices - only the working out step is shown

When I try to enter a matrix, something like this: [8,9;7,1], and click enter, where the matrix should look like a correct matrix, it's just the working out steps and there's another set of square brackets. This also happens when I try to do something like square root of square root of 61 squared + 15 squared. I click enter and the working step is just showed - you can see this symbol (^) and heaps of brackets instead of a proper equation.

I've tried resetting and comparing my modes to numerous teachers and students but no one can figure it out.

Posted by on

nope - that doesn't work. it'll just put it in approximate mode.

thanks anyway

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• Level 1:

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• Contributor

Try hitting the diamond button and then hitting answer after it shows up, it should give you a different outcome than the original. hope that helped.

Posted on Nov 12, 2008

Hi,
a 6ya Technician can help you resolve that issue over the phone in a minute or two.
Best thing about this new service is that you are never placed on hold and get to talk to real repair professionals here in the US.
Goodluck!

Posted on Jan 02, 2017

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## Related Questions:

### How to compute a matrix

1. First you must set Matrix calculation: Press [MODE][6:Matrix].
2. 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].
3. Once finished entering the matrix you clear the screen.
4. The operations on A SINGLE matrix are available by pressing [Shift][Matrix].
5. The choices are
• [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

Once you have created a square matrix, for example matA.
You press
[Shift][Matrix] [7:det] [SHIFT][MATRIX][3:MatA], close the parenthesis and press [ENTER].

If you have defined two similar matrices (same number of row and same number of columns) you can ADD them or subtract them. The operation keys are Plus and Minus as for any number.
To multiply you use the multiplication sign. The matrices must be compatible (mxn) multiplied by (nxk).

Aug 10, 2011 | Casio FX-115ES Scientific Calculator

### How to do matrix multiplication in scientifically calculator

Here is an account of what you can do with matrices on this scientific calculator. Certain precautions must be taken as concerns the dimensions of the matrices. Refer to your text book on matrix algebra.
On this calculator the largest matrices you can define have dimensions 3X3.
1. First you must set Matrix calculation: Press [MODE][6:Matrix].
2. 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].
3. Once finished entering the matrix you clear the screen.
4. The operations on A SINGLE matrix are available by pressing [Shift][Matrix].
5. The choices are
• [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

Once you have created a square matrix, for example matA.
You press
[Shift][Matrix] [7:det] [SHIFT][MATRIX][3:MatA], close the parenthesis and press [ENTER].

If you have defined two similar matrices (same number of row and same number of columns) you can ADD them or subtract them. The operation keys are Plus and Minus as for any number.
To multiply you use the multiplication sign. The matrices must be compatible (mxn) multiplied by (nxk).

Aug 10, 2011 | Casio FX-115ES Scientific Calculator

### How to multiply matrix on fx-991ES calculator?

hi..

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

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

X
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.

have a good time with Casio FX 991ES

Mar 26, 2011 | Computers & Internet

### 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

### How do I solve a matrix? I have the manual but do not understand it

I will not try to guess what you mean by "solve a matrix", but I believe that what follows will help you.

1. First you must set Matrix calculation: Press [MODE][6:Matrix].
2. 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].
3. Once finished entering the matrix you clear the screen.
4. The operations on A SINGLE matrix are available by pressing [Shift][Matrix].
5. The choices are
• [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

Once you have created a square matrix, for example matA.
You press
[Shift][Matrix] [7:det] [SHIFT][MATRIX][3:MatA], close the parenthesis and press [ENTER].

If you have defined two similar matrices (same number of row and same number of columns) you can ADD them or subtract them. The operation keys are Plus and Minus as for any number.
To multiply you use the multiplication sign. The matrices must be compatible (mxn) multiplied by (nxk).

If you know the theory behind systems of linear equations you can use matrices to solve the systems.

Nov 26, 2010 | Casio FX-115ES Scientific Calculator

### Matrix

Here is copy of the answer I posted to a question on how to use Matrices. Read it carefully. It helped a few people, and there is no reason why it should not help you too. If after a bona fide effort to understand it you still have a problem, post a comment here. What I am saying, is do not just shoot the answer, try it first.

First you must set Matrix calculation
[MODE][6:Matrix].
1. 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)
2. Once finished entering the matrix you clear the screen.
The operations on a single matrix are available by pressing[Shift][Matrix]. They are
• [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
Operations involving 2 matrices
2. To subtract: MatA-Matb
3. To multiply: MatAxMatB
4. To raise a matrix to a power 2 [x2], cube [x3]
5. To obtain inverse of MatA already defined MatA[x-1] where [x-1] is the x to the power -1 key
Dimensions of matrices involved in operations must match (see you textbook for the rules). Read the appendix to your user manual, there are several examples.

Jan 07, 2010 | Casio FX-115ES Scientific Calculator

### How to use matrix in calculater i know to inter in matrix mode but only one data can be inter for eg: {1 1} but i cant 2nd one and muntuply it { 1 2}

Here is copy of the answer I posted to a question on how to use Matrices. Read it carefully. It helped a few people, and there is no reason why it should not help you too. If after a bona fide effort to understand it you still have a problem, post a comment here. What I am saying, is do not just shoot the answer, try it first.

First you must set Matrix calculation
[MODE][6:Matrix].
1. 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)
2. Once finished entering the matrix you clear the screen.

The operations on a single matrix are available by pressing[Shift][Matrix]. They are
• [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
Operations involving 2 matrices
2. To subtract: MatA-Matb
3. To multiply: MatAxMatB
4. To raise a matrix to a power 2 [x2], cube [x3]
5. To obtain inverse of MatA already defined MatA[x-1] where [x-1] is the x to the power -1 key
Dimensions of matrices involved in operations must match (see you textbook for the rules). Read the appendix to your user manual, there are several examples.
Hope helps

Dec 17, 2009 | Casio FX-115ES Scientific Calculator

### How do i do a matrix problem in my casio fx 115 es, i don't get to work manual instruccions with my book problems

Hello
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 subtract MatA-MatB
To multiply MatAxMatB
To raise a matrixe to a power 2 [x2], cube [x3]
To obtain inverse of MatA already defined MatA[x-1] [x-1] is the x to the power -1 key
Dimensions of matrices involved in operations must match (see you textbook for the rules)

Hope helps

Oct 11, 2009 | Casio FX-115ES Scientific Calculator

### How to do matrix multiplication on Casio 115ES?

Hello
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 subtract MatA-MatB
To multiply MatAxMatB
To raise a matrixe to a power 2 [x2], cube [x3]
To obtain inverse of MatA already defined MatA[x-1] [x-1] is the x to the power -1 key
Dimensions of matrices involved in operations must match (see you textbook for the rules)

Hope helps

Sep 10, 2009 | Casio FX-115ES Scientific Calculator

### Matrices

Press AC to exit the matrix editor and enter the matrix calculation screen. From this screen you can access any matrix by pressing SHIFT [MAT] (the 4 key) and selecting "MatA", "MatB", or "MatC".

Try working through the examples in the manual and the appendix.

Jul 26, 2008 | Casio FX-115ES Scientific Calculator

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