HP Prime Graphing NW280AAABA manual App functions and variables, Asjw5

Sequence app—see chapter 17, “Sequence app”, beginning on page 281.

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. See “Customizing an app” on page 522.

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 find the derivative of x2 – 5 at x = 2. One way, using an app function, is as follows:

1.Press D.

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:

Asjw5

4.Enter the parameter separator:

o

5.Enter the x-value and press

E.

The slope (that is the derivative) at x = 2 is calculated: 4.

All the app functions are described in “App menu”, beginning on page 347.

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.

An introduction to HP apps 109