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12-6 Matrices

Matrix arithmetic

You can use the arithmetic functions (+, –, ×, / ) with matrix

arguments. Division left–multiplies by the inverse of the

divisor. You can enter the matrices themselves or enter the

names of stored matrix variables. The matrices can be real or

complex.

For the next four examples, store [[1,2],[3,4]] into M1 and

[[5,6],[7,8]] into M2.

Example 1. Create the first matrix.

>6+,)7@

MATRIX

1(:_2._

1 >(17(5@ 2>(17(5@*e,

3 >(17(5@ 4>(17(5@

2. Create the second

matrix.

>6+,)7@

MATRIX *e,

1(:_

2._

5 >(17(5@ 6>(17(5@

*e, 7 >(17(5@ 8 >(17(5@

3. Add the matrices that you created.

>+20(@>$/3+$@M1 >@

>$/3+$@M2 >(17(5@

To multiply and

divide by a scalar

For division by a scalar, enter the matrix first, then the

operator, then the scalar. For multiplication, the order of the

operands does not matter. The matrix and the scalar can be

real or complex. For example, to divide the result of the

previous example by 2, use the following key presses:

>j@ 2 >(17(5@

HP 39G User Manual

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