
In the Advanced Graphing app, tap-and-hold on the plot you are interested in. Either the plot is selected, or a
menu of plots appears for you select one.
Evaluating a function
One of the primary uses of the trace functionality is to evaluate a plotted denition. Suppose in Symbolic view
you have dened F1(X) as (X – 1)
2
– 3. Suppose further that you want to know what the value of that function
is when X is 25.
1.
Open Plot view ( ).
2.
If the menu at the bottom of the screen is not open, tap .
3.
Tap .
4.
Enter 25 and tap .
5.
Tap .
The value of F1(X) when X is 25 as shown at the bottom of the screen.
This is one of many ways the HP Prime calculator provides for you to evaluate a function for a specic
independent variable. You can also evaluate a function in Numeric view (see Common operations in Numeric
view on page 97). Moreover, any expression you dene in Symbolic view can be evaluated in Home view. For
example, suppose F1(X) is dened as (X – 1)
2
– 3. If you enter F1(4) in Home view and press you
get 6, since (4 – 1)
2
– 3 = 6.
Turning tracing on or o
●
To turn on tracing, tap .
●
To turn o tracing, tap .
If these options are not displayed, tap .
When tracing is o, pressing the cursor keys no longer constrains the cursor to a plot.
90 Chapter 6 Introduction to HP apps
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