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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
you can try the following solutions:
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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).
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
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
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.
On Next Screen , enter values on each positions
Press UP, DOWN, LEFT, RIGHT Keys to move around in matrix and specify each element.
Now we inputed Details about Matrix A. If you want to specify other matrices (MATRIX B, MATRIX C) repeat STEPS 2 To STEP 4
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
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.
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.
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
[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
[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
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 mXnmatrix has m rows and
n columns. To perform multiplication of an kXlmatrix 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).
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
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.
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]  [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.
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.