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There are also a number of special functions available for list variables which
are contained in the List group of functions in the MATH menu. See page 265.
List functions
A special List Catlogue is provided which
allows easier entering and editing of lists. If
you look above the 7 key you will see a label of
LIST which gives you access to this catalog.
When you enter this catalog you will see the
screen on your right.
Pressing the DEL key when on one of these lists will delete that list, clearing
the memory it uses. Pressing BLUE CLEAR (above the DEL key) will clear
all lists. In both cases a query message pops up asking whether you are
sure you want to do this.
Editing a list
If you press the
key then you will enter a
special editing screen which allows you to
change individual values, delete values (using
the DEL key) and insert new elements into a
list. If you press the
key with the highlight in the position shown, then a
zero is inserted before the 4, with all the elements below shifted down one
position. You can then type your new number.
Having entered the editing screen, you may be wondering how to exit, since
no key is apparently provided for this. Simply press SHIFT LIST again to
return to the catalog level (or press HOME if you've finished altogether).
Operations on elements
Changing of individual elements of a list can
also be done in the HOME view, if not quite so
easily. As we saw earlier, typing L1 and
pressing ENTER will display an entire list in the
HOME view. If you want to see just element 3, for example, then typing
L1(3) will display just that one element (see right). As you can also see,
you can change just one element using the store command. It is not possible
to insert an extra element, except in that you could add an element to the end
of a list using the CONCAT function discussed on the next page.
Lists can be sent from one hp 39g+ to another
using the infra-red link with the aid of the two
keys labeled
and
. The procedure
is the same as that for sending aplets from one
calculator to another.
177
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