HP 50g User Manual page 109

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 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
and keys are selected.
(2) Enter the following:
(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 column of two zeroes appears in the first column.
(7) Press @GOTO@ 3 @@OK@@ 3 @@OK@@ @@OK@@ to move to position (3,3).
(8) Press . This will place the contents of cell (3,3) on the stack,
although you will not be able to see it yet. Press ` to return to
normal display. The number 9, element (3,3), and the full matrix
entered will be available in the stack.
@+ROW@ @-ROW @+COL@ @-COL@
1`2`3`
L @GOTO@ 2 @@OK@@ 1 @@OK@@ @@OK@@
4`5`6`
7`8`9`
@GOTO@
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