Matrix Calculations - Casio fx-570AR X User Manual

Matrix Calculations

Use the Matrix Mode to perform calculations involving matrices of up to 4
rows by 4 columns. To perform a matrix calculation, use the special matrix
variables (MatA, MatB, MatC, MatD) as shown in the example below.
2 1
Example:
1 1
1. Press , select the Matrix Mode icon, and then press .
2. Press (MatA)(2 rows)(2 columns).
• This will display the Matrix Editor for
input of the elements of the 2 × 2
matrix you specified for MatA.
3. Input the elements of MatA: 2111.
4. Perform the following key operation: (Define
Matrix)(MatB)(2 rows)(2 columns).
5. Input the elements of MatB: 2112.
6. Press  to advance to the calculation screen, and perform the
calculation (MatA × MatB): (MatA)(MatB).
• This will display the MatAns (Matrix
Answer Memory) screen with the
calculation results.
Matrix Answer Memory (MatAns)
Whenever the result of a calculation executed in the Matrix Mode is a
matrix, the MatAns screen will appear with the result. The result also will be
assigned to a variable named "MatAns".
The MatAns variable can be used in calculations as described below.
• To insert the MatAns variable into a calculation, perform the following key
operation: (MatAns).
• Pressing any one of the following keys while the MatAns screen is
displayed will switch automatically to the calculation screen: , ,
, , , , (x
Assigning and Editing Matrix Variable Data
To assign new data to a matrix variable
1. Press (Define Matrix), and then, on the menu that appears,
select the matrix variable to which you want to assign data.
2. On the dialog box that appears, use a number key ( to ) to
specify the number of rows.
3. On the next dialog box that appears, use a number key ( to ) to
specify the number of columns.
4. Use the Matrix Editor that appears to input the elements of the matrix.
To edit the elements of a matrix variable
Press (Edit Matrix), and then, on the menu that appears, select the
matrix variable you want to edit.
To copy matrix variable (or MatAns) contents
1. Use the Matrix Editor to display the matrix you want to copy.
• If you want to copy MatAns contents, perform the following to display
the MatAns screen: (MatAns).
2. Press , and then perform one of the following key operations to
specify the copy destination: (MatA), (MatB), (MatC), or
(MatD).
2 -1
×
-1 2
3
).
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