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EL-9900 Graphing Calculator There may be Enter a 3x3 matrix A 2 Enter a 3x3 Enter two matrices and execute multiplication of the two A 1 2 1 2 1 -1

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EL-9900 Graphing Calculator

There may be differences in the results of calculations and graph plotting depending on the setting. Return all settings to the default value and delete all data. As the Matrix feature is only available on the Advanced keyboard, this section does not apply to the

Basic keyboard.

Entering and Multiplying Matrices

1. Enter a 3x3 matrix A

2. Enter a 3x3 matrix B

3. Multiply the matrices A and B

Access the matrix menu.

Set the dimension of the matrix at

three rows by three columns.1-1 1-2

Example

Enter the elements of the first row,

the elements of the second row, and the elements of the third row. 1-3 A matrix is a rectangular array of elements in rows and columns that is treated as a single element. A matrix is often used for expressing multiple linear equations with multiple variables. Enter two matrices and execute multiplication of the two. A

1 2 1

2 1 -1

1 1 -2

B

1 2 3

4 5 6

7 8 9

MATRIXB

1 33
121
21 1
11 2

ENTER ENTER

ENTER ENTER

ENTER

ENTER ENTER

ENTER

ENTERENTERENTER

Before

Starting

NotesStep & Key OperationDisplay

2nd F

Step & Key OperationDisplayNotes

EL-9900 Graphing Calculator

Matrix multiplication can

be performed if the num- ber of columns of the first matrix is equal to the num- ber of rows of the second matrix. The sum of these multiplications (1 1 + 2 4 + 1

7) is placed in the 1,1

(first row, first column) po- sition of the resulting ma- trix. This process is re- peated until each row of A has been multiplied by each column of B.Enter a 3x3 matrix B. 2

Multiply the matrices A and B

together at the home screen.3-1

Delete the input matrices for

future use.3-2 Matrix multiplication can be performed easily by the calculator.

MATRIX

MATRIX MATRIX

X B233 12 3 456
78
9 A1 A 2 C 2 2nd F QUIT

2nd FOPTION

ENTERENTER

ENTER ENTER ENTER

ENTER

ENTERENTER

ENTER ENTER ENTER

ENTER ENTER

ENTER2nd F

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