HP 38g Graphing Calculator - Manual (Page 26)

“Deleting”
Variables
Home and
Aplet
Variables
A variable always has a value in it, even if that value is zero.
When you store another value into a variable, it overwrites the
previous value. So you cannot delete a variable’s value, but
you can overwrite it.
The predefined variable names (such as A through Z) always
exist; you cannot change or delete them.
Most variables are Home variables, which means they are
shared throughout the different contexts of the calculator.
Some variables are aplet variables, which means they apply
only to the current aplet. Aplet variables are data sets,
expressions, and settings made within an aplet.
Notes and Sketches
The HP 38G has compact text and picture editors for entering
notes and sketches.
® The Notepad is an independent collection of notes.
* Each aplet includes a Note view and a Sketch view for
that aplet only.
Note View and Sketch View
You can attach text to an aplet in its Note view (■ [NOTE]),
or attach pictures to it in its Sketch view (■ [SKETCH]).
To write a note 1. In an aplet, press ■ [NOTE] for the Note view.
In Note view
2. Use the note editing keys shown below.
3. Set Alpha lock (([A...Z}}) for quick entry of letters. For
lowercase Alpha lock, press ■ ((A...Z}}.
® To type a single letter of the opposite case, press
■ letter.
4. Your work is automatically saved. When done, turn off
Alpha lock (by pressing ([A...Z h ]}) if you want to go to
Home. (Otherwise, the | home | key will still type A.)
1-18 Getting Started