HP 39gs_40gs_Mastering The Graphing Calculator_English_E_F2224-90010
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As was mentioned earlier, most of the aplets you download will have
‘helper’ programs associated with them. These are stored in the
Program Catalog. If you want more information on these ‘helper’
programs then read the chapter on programming and, in particular, the
SETVIEWS command. Apart from curiosity, there is one important
respect in which you need to know about these programs and that is
when it comes time to delete an aplet. As you would expect, this is
initially done in the
APLET view by highlighting the aplet and then pressing DEL.
If the aplet is simple a copy of one of the standard ten, then that is the end of the process. However if the
aplet has a set of one or more programs associated with it then those programs will not be deleted and will
still be taking up memory. To delete these left over programs you will need to switch to the
Program Catalog
and remove them. Even with 230Kb to play with it is advisable to do this or your memory will gradually be
used up.
As an example of this, look at the aplet called “Coin Tossing” shown in
the
APLET view right. Looking at the list of programs shown in the
Program Catalog view, you will see a set of programs which all begin
with the letters
.COIN. The convention encouraged by Hewlett-Packard
is to name the programs so that it is fairly obvious which ones belong to
which aplet, hence the
.COIN code for an aplet called “Coin Tossing”.
Simply position the highlight on each of the programs in turn and press
the
DEL key. If your calculator only contains one aplet with programs
linked, then it is faster to use
SHIFT CLEAR to delete all programs at
once.
The
Program Catalog view has no key. If you store a large
number of aplets then you may find that you start to have trouble telling
what program belongs and what should be deleted but for the average
user this probably will not be a problem. The naming convention should ensure that you are able to work out
which is which. If you know the first letter of the name of the program then pressing that letter on the
keyboard will take you to it.
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