HP 39gs Master Manual page 47

The SYMB view
Now press the key. When you do, your screen should change
so that it appears like the one on the right. This is the
Notice that the screen title is supplied so that you will know where you
are (if you didn't already).
Calculator Tip
Pressing
Whenever there is an obvious choice pressing
produce the desired effect.
θ
XT
The button
Whenever you enter an aplet, one of the keys which often changes its function is the key labeled
label suggests, it supplies an
produce a graph of the quadratic we dealt with in the earlier section on the
Using the up/down arrows, move the cursor (if necessary) to the line labeled
Type in:
This will produce the screen shown on the right. Notice the check/tick
mark next to the
F1(X)
signifies that this function is to be graphed, so that if you had five
functions entered but only wanted 1 and 3 graphed, you could simply
ensure that only and
F1(X)
ing your function
The key that turns the check on or off is a screen key - the one labeled with the
terminology it is a 'toggle' key - when the check is off it turns it on and when on it turns it off. In some
countries a check mark is called a 'tick' but the idea is the same.
Try turning the check on and off for function
the check can be changed. Make sure it's checked when you have finished.
rather than
ENTER
, or a , or a θ, depending on which aplet you are in. Let's use that key to
X T
that appeared when you pressed
were checked.
F3(X)
F1(X)
view.
SYMB
woul d have had the same effect.
ENTER
. This
ENTER
. Remember, the highlight has to be on the function before
47
will usually
XT
view.
HOME
.
F1(X) =
. In computer
θ . As its