The Symb View; The Xtθ Button; Ing Your Function - HP 39g Master Manual

SYMB
The view
Now press the
screen should change so that it appears like
the one on the right. This is the SYMB view.
Notice the screen title so that you will know
where you are (if you didn't already).
XTθ
The button
Whenever you enter an aplet, one of the keys which usually changes its
function is the key labeled XT θ . As its label suggests, it supplies an X, or a
T, or a θ, depending on which aplet you are in. Let's use that key to produce
a graph of the quadratic we dealt with in the earlier section on the HOME view.
Using the up/down arrows, move the cursor (if necessary) to the line
F1(X) = .
Type in:
XT θ
3 X²
This will produce the screen shown on the
right. Notice the check/tick mark next to the
function F1(X). This signifies that this
function is to be graphed, so that if you had
five functions entered but only wanted
numbers 1, 3 and 4 graphed, you could simply
ensure that only F1(X), F3(X) and F4(X) were checked.

ing your function

The key that turns the check on or off is a screen key - the one labeled with
the . 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' mark but the
idea is the same.
key. When you do, your
Calculator Tip
Pressing here would have had the same effect.
ENTER
Whenever there is an obvious choice pressing
usually produce the desired effect.
XT θ
- 5 - 4 ENTER
52
will
ENTER