HP 50G, User Manual

Page: 282 / 887

Page 9-5
The
@+ROW@
key will add a row full of zeros at the location of the selected
cell of the spreadsheet.
The
@-ROW
key will delete the row corresponding to the selected cell of
the spreadsheet.
The
@+COL@
key will add a column full of zeros at the location of the
selected cell of the spreadsheet.
The
@-COL@
key will delete the column corresponding to the selected cell
of the spreadsheet.
The
@ →
STK@@
key will place the contents of the selected cell on the stack.
The
@GOTO@
key, when pressed, will request that the user indicate the
number of the row and column where he or she wants to position the
cursor.
Pressing
L
once more produces the last menu, which contains only one
function
@@DEL@
(delete).
The function
@@DEL@
will delete the contents of the selected cell and
replace it with a zero.
To see these keys in action try the following exercise:
(1) Activate the Matrix Writer by using
„²
. Make sure the
@VEC
and
@GO
→
keys are selected.
(2) Enter the following:
1`2`3`
L @GOTO@ 2 @@OK@@ 1 @@OK@@ @@OK@@
2`1`5`
4`5`6`
7`8`9`
(3) Move the cursor up two positions by using
———
. Then press
@-ROW
.
The second row will disappear.
(4) Press
@+ROW@
. A row of three zeroes appears in the second row.
(5) Press
@-COL@
. The first column will disappear.
(6) Press
@+COL@
. A row of two zeroes appears in the first row.
(7) Press
@GOTO@ 3 @@OK@@ 3 @@OK@@ @@OK@@
to move to position (3,3).
(8) Press
@ →
STK@@
. This will place the contents of cell (3,3) on the stack, although
you will not be able to see it yet.
(9) Press
`
to return to normal display. Element (3,3) and the full matrix will
be available in the screen.