HP 38g Graphing Calculator - Manual (Page 136)

Matrix Arithmetic
You can use the arithmetic functions (+, -, X, /) with matrix
arguments. Multiplication and division have different
meanings depending on whether one of the arguments is a
scalar or not.
Adding and For addition and subtraction, the dimensions of the matrices
Subtracting must be the same. 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 Ml and
[[5,6],[7,8]] into M2.
m [MATRIX] ([NEW]} ([OK]}
1 I ENTER I 2 I ENTER I E 3
I ENTER I 4 I ENTER I
■ [MATRIX] [ t ] [[ new ]}
([OK]} 5 I ENTER I 6 0
I ENTER I 7 I ENTER I 8 I ENTER I
M2 1 2
1
S
s 1
I HOME 11 A...Z |M 1 0
|A...Z|M 2 I ENTER I
im
M1+M2
Has
[ [ 6 , 8 ] , [ 1 0 , 1 2 3 ]
Multiplying For division by a scalar, enter the matrix first, then the
and Dividing operator, then the scalar. For multiplication, the order of the
by a Scalar operands does not matter. The matrbc and the scalar can be
real or complex.
¡7] 2 I ENTER I
(This diuides the previous
matrix sum by 2.)
m+M2
[ [ 6 , 8 ] , [ 1 0 , 1 2 ] ]
flnsx2
__________ [ [ 3 , 4 ] , [ 5 , 6 ] ]
BEHi
6-6 Using Matrices