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Im in the matrix B, but I do not know how to erase the 2x2 off there to start over again?

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You can open the memory management program and delete the Matrix B.

  1. Press [2nd][+] to open (MEM)ory management.
  2. Select [2:Mem Mgt/Del..]
  3. Press [5:Matrix]
  4. In the list of Matrices , use the down Arrow to move cursor to the level of Matrix B and press [DEL] to delete it.
  1. Press [2nd][X^-1] to open the (Matrix) editor
  2. Use the right Arrow to highlight [EDIT],
  3. Use the DownArrow to highlight [B] or press [2:[B]]
  4. The editor screen opens, with the cursor blinking on the first dimension
  5. Change the first dimension
  6. Use the right arrow move cursor to the 2nd dimension and change it, then [ENTER]
  7. In the matrix template that opens, type in the values: the old values will not be erased, so make sure you change them if necessary.

Posted on May 13, 2010

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Casio fx-9750GII is giving the wrong answer, is it broken?

Check the calculator with a simple 2X2 matrix that you can invert by hand easily and see if it gives you the wrong inverse for it. It is also possible that YOU made the mistake.

Jan 03, 2016 | Casio FX-9750GII Graphing Calculator

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Sorry, but your matrices do not make sense.If you multiply a matrix by a scalar the resulting (product) matrix has exactly the same structure as the one you multiplied : (mXn) times a yields another (mXn) matrix.
Be it as it may, when you multiply a matrix by a scalar, you obtain the product by multiplying every element of the original matrix by the scalar.

Here is a screen capture showing the multiplication of a 2X2 matrix by a scalar.

Note: I have noticed that screen captures I insert in my answers are sometimes deleted (by FixYa?). So if you do not see a picture it has nothing to do with me.

Dec 11, 2011 | Office Equipment & Supplies

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Ti 89 titanium when multiply 2x2 matrix by 2x1 matrix get error diemensions

Matrix multiplication is defined only when the width of the first matrix is equal to the height of the second. You can multiply a 2x2 matrix by a 1x2 matrix or multiply a 2x1 matrix by a 2x2 matrix, but you cannot multiply a 2x2 matrix by a 2x1 matrix.

Jun 13, 2011 | Texas Instruments TI-89 Calculator

1 Answer

How do you add matrices such as a (2x2) (2x3) on a casio fx-9750g

Here is enough to get you started and a little more.
Read the post ant consult your calculator manual. The screen captures below may not look exactly as your calculator but the steps are identical.

A. Define a matrix (Create it)
  1. Turn calculator ON.
  2. Press Menu,select the MAT icon and press [EXE]
  3. You see a list of possible matrix labels (A, B, C,D,E,F)
  4. All that have not been created have a "none" to their right
  5. Highlight a matrix name and press the right arrow. Where there was "none" , you have a template 0x0.
  6. That is where you specify the dimensions (mxn). example. 2x2
  7. Enter the first dimension and press [EXE]
  8. Enter the 2nd dimension and press [EXE]
  9. A matrix template opens where you enter the coefficients left to right and up down.
  10. After each coefficient press [EXE]. Cursor moves to the next coefficient, etc.
Press [SHIFT][QUIT] to return to the list of matrices to create new ones

B Operations on matrices
Once you have one matrix, you can do operations on it: Calculate the determinant (if matrix is square), calculate its inverse, transpose, augment it, fill it, etc..
  1. These operations are accessed as follows.
  2. Quit the matrix editor by pressing [Menu] and selecting the [Run] application.
  3. Press [OPTN][F2:MAT]
  4. You have the menus Mat,M(atrix)->L(ist), Det(erminant), Trn (transpose), Aug(ment) ->, Iden(tity),Dim(ension) Fill
Example : calculate the determinant of a matrix A (already defined).
  1. You press the [OPTN][F2:MAT] key sequence (just above)
  2. Press [F3:Det]; the command det is displayed on screen.
  3. Press [F1:Mat] the identifier Mat is displayed.
  4. Press [ALPHA] A; screen display det Mat A.
  5. Press [EXE] to get the value of the determinant.
C. Square of Matrix A
[OPTN][F2:MAT] (MAT) [Alpha] A ^2 [EXE]

D. Product of two compatible matrices MatAXMatB

[OPTN][F2:MAT] (MAT) [Alpha] A [*] (MAT) [ALPHA] B [EXE]


Part E Invert a (square, non singular) matrix that was already defined.

Press [OPTN] [F2:Mat] to open a screen similar to the one in capture above
Press [F1:Mat] to have identifier Mat displayed.
Enter the name of the matrix by pressing [ALPHA] A, for example.
Press [SHIFT] [ ) ] activate the (x^-1) key.

This is what you might see (with parentheses and without).

Press [EXE] button to calculate the inverse.

Mar 23, 2011 | Casio FX-9750GPlus Calculator

1 Answer

I am attempting to do some basic 2x2 matrix multiplication on my Casio fx-115ES calculator, however it is behaving oddly and I do not know why. I can do the following: Press Mode, Press 6 for Matrix,...

When you press MODE 6 for Matrix, you're clearing any previously entered matrices. So, you're clearing MatA when you go to enter MatB.

Instead, after entering MatA press SHIFT 4 to bring up the Matrix menu, press 1 for DIM, press 2 for MatB, press 5 for 2x2, and enter the data.

Oct 17, 2010 | Casio FX-115ES Scientific Calculator

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I want to learn how to solve matrix with my calculator casio fs 115es

I will assume you are familiar with the basic concepts of matrix algebra.

Turn calculator [ON]
Press [MODE][6:MATRIX]. Select the matrix you want: MatA, MatB, Matc
Let us assume you select 1: MatA.
MatA (mxn) sceen: there you specify the dimensions of the matrix, the number of rows, and the number of columns. Press 5 for a 2x2 matrix.
The matrix entry screen shows, a rectangle is highlighted. Enter there the a_11 coefficient, exemple 1.
1 [ENTER]. Highlight moves to a_12 ;
1 [ENTER] highlight moves to a_21
1 [ENTER] highlight moves to a_22
2 [ENTER] Highlight stays on a_22.
Matrix is defined. The values I used are arbitrary. Enter your own.

Suppose you want to calculate the determinant of MatA
Press [SHIFT][MATRIX][7:det][SHIFT][MATRIX][3:MatA] [)] [=]

Now you want to calculate the square of matA.
Press [SHIFT][MATRIX][3:MatA] [x^2][=]
A 2x2 matrix is displayed. It is MatA[^2].

If you define MatA, MatB, MatC y

Sep 24, 2009 | Casio FX-115ES Scientific Calculator

1 Answer

Trying to get the inverse of a matrix


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
Here is the link to download the manual and the appendix

Hope it helps

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

1 Answer

How do i multiply a (2x2) matrix by a (2x1) in the ti 89

The so-called (2x1) matrix is not a matrix. It is a vector.
Hope it helps.

Apr 26, 2009 | Texas Instruments TI-89 Calculator

1 Answer

I get a dimension error on my screen from my matrix

You cannot calculate the inverse of an arbitrary matrix. It must be a square matrix (nxn) with non zero determinant. Make sure dimensions m and n are equal. (2x2), (3x3)

To calculate its determinant [Shift][MATRIX] [7:det] [SHIFT][MATRIX][3:MatA] close the right parenthesis and [=].
If determinant is different from zero then you can calculate its inverse.
If matrix MatA has already been defined, you calculate its inverse as follows;
[SHIFT][MATRIX][3:MatA] [X^-1][=]. Use the X to -1 power , the one under [MODE].
For well-behaved matrices you calculate the inverse directly without worrying about the determinant.
Hope it helps.

Apr 16, 2009 | Casio FX-115ES Scientific Calculator

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