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HP 9g Clearing, Editing and Correcting
Alphabetic function keys are in blue on the keyboard and they are entered by pressing first the W key. Once pressed,
the A annunciator is turned on. As before, this mode can be locked by pressing ~w to enter several characters
consecutively. Just press W to unlock this mode.
There are tow keys to delete characters in the entry line: Z and :. The : key works in two ways. If there are
characters at the right of the cursor, pressing : deletes all these characters: from the cursor to the end of the entry
line. But if there aren't any characters beyond the blinking cursor, pressing : deletes the entire entry line, that is, all
characters from the beginning to the cursor (the end of the line).
To replace a character with another one, place the cursor where the character to be replaced is, press Z and key in
the new character. If the cursor is at the end of the entry line, pressing Z deletes the previous character. In fact, the
term character does not only mean a number or a letter in this context, but also a function name.
Once = has been pressed the entry line is processed and the result appears in the result line. But the expression is
not lost, it's kept internally in a "history stack." Up to 252 characters from already evaluated expressions are stored in this
stack, not only from the most recent expression but older expression are also stored and can be recalled by the up and
down cursor keys: ... and ‡. To go to the top of the history stack (i.e. the oldest entry) press Wr and to go tot he
bottom of the stack press Ws and the most recent entry will be displayed.
The HP 9g has a very handy function to undo a deletion: ~Û(on the = key). It undoes what both Z and :
do, just make sure no other character has been entered since the deletion for the undo function to work.
In the following examples, unless stated otherwise, assume that the cursor is at the beginning of the line, as if the
expression had been evaluated and recovered from the history stack
Practice editing the entry line
Example 2: Change 89 + 65 × 2 to 99 + 65 × 2.
Solution:
9Z
Example 3: Change 89 + 65 × 2 to 89 – 65 × 2
Solution:
††-Z
Example 4: Change 89 + 65 × 2 to 89 + 65 × 3
Solution:
Wt„Z3
Example 5: Change 89 + 65 × 2 to 89 + 65 / 3
Solution:
Wt„„ : /3
Example 6: Enter 30+ sin
Solution:
Let's key in the first expression: 30+~h.58. The = key has not yet been
pressed, that is to say, the cursor is still blinking in the entry line and the result line remains blank. To
hp calculators
(0.58) but, before executing it, you realized you wanted to calculate 30+ cos
-1
- 3 -
HP 9g Clearing, Editing and Correcting - Version 1.0
(0.58) instead.
-1
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