HP Prime Graphing Wireless Calculator Manual do Utilizador Página 155

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As well as cloning a built-in app—as described above—you can modify the internal workings of a customized
app using the HP Prime programming language.
App functions and variables
Functions
App functions are used in HP apps to perform common calculations. For example, in the Function app, the Plot
view Fcn menu has a function called SLOPE that calculates the slope of a given function at a given point. The
SLOPE function can also be used from the Home view or a program.
For example, suppose you want to nd the derivative of x
2
– 5 at x = 2. One way, using an app function, is as
follows:
1.
Press .
2.
Tap and select Function > SLOPE.
SLOPE() appears on the entry line, ready for you to specify the function and the x-value.
3. Enter the function:
5
4. Enter the parameter separator:
5.
Enter the x-value and press .
The slope (that is the derivative) at x = 2 is calculated: 4.
Variables
All apps have variables, that is, placeholders for various values that are unique to a particular app. These
include symbolic expressions and equations, settings for the Plot and Numeric views, and the results of some
calculations such as roots and intersections.
App functions and variables 107
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