HP 39gs Master Manual page 210

Graphing calculator
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If you look at the list of screen keys on the bottom of the view, you will
see one labeled
. This determines which way the highlight will
move (across or down) when you enter a number. If you press the key
repeatedly you will see it change from
(down), to
(no movement).
You will also see the usual
used to insert an extra row or column into an existing matrix. The
keyboard
key can be used to delete a row or column.
DEL
With movement set to
after each. Your display should now look like the screen shot
ENTER
right.
If you now press the down arrow key on the keyboard the highlight will
move back to the first element in the second row. Enter the numbers 4, 5
and 6 and you will find that the calculator automatically drops down to
row three without the need to use the down arrow key again, since it
now knows how many columns the matrix is to contain. Finish your
matrix so that it looks like the one shown right.
Now press
to switch back to the
MATRIX
and, with the highlight on
matrix shown right.
Matrix calculations in the HOME view
Switch to the
view and multiply
HOME
result displayed in the
HOME
Highlighting it and pressing
readable manner.
(across), to
key, and an
, type in the numbers 1, 2 and 3, pressing
MATRIX Catalog
, press
and create the
M2
. As you can see, the
M1*M2
view is not very useful or readable.
displays the matrix in a far more
key that can be
⎡ 2
1 ⎤
⎢ 3
4 ⎥ ⎥
7 ⎥ ⎦
⎣ − 1
210

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