HP 38g Graphing Calculator - Manual (Page 135)

Creating a 1.
Matrix in
Home
2.
3.
4.
and each row with brackets (the shifted [|] and |T| keys).
Separate each element and each row with a comma.
Example: [ [ 1 , 2 ] , [ 3 , 4 ] ] . (Note: if the Decimal Mark
in MODES is set to Comma, use periods as separators.)
set of brackets. Example: [ 1 , 2 , 3 ] .
4. Press I ENTER I to enter and display the matrbc.
Immediately after typing in the matrbi, you can store it in a
variable by typing {{STO^}} matrixname j enter |. The matrix
variable names are Ml through M9, and MO.
The left screen below shows the matrix
[ [ 2 . 5 , 7 2 9 ] , [ 1 6 , 2 ] ] being stored into M5. The screen
on the right shows the vector [ 6 6 , 3 3 , 1 1 ] being stored into
M6. Note that you can enter an expression (like 5/2) for an
element of the matrix, and it will be evaluated.
HOME HOME
[ 6 6 , 3 3 , 1 l i m e
C C 2 . 5 , 7 2 9 ] , C 1 6 , 2 ] ] [ 6 6 , 3 3 , 1 1 ]
To store one In Home, enter value {{STO^}} matrixname(row,column'). For
element example, to change the element in the first row and second
column of M5 to 728, type
728 {{ST0H}M5(1,2) | ENTER|.
Using Matrices 6-5