HP Prime Graphing Wireless Calculator Instrukcja Użytkownika Strona 138

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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 denition. Suppose in Symbolic view
you have dened 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 specic
independent variable. You can also evaluate a function in Numeric view (see Common operations in Numeric
view on page 97). Moreover, any expression you dene in Symbolic view can be evaluated in Home view. For
example, suppose F1(X) is dened 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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