HP Prime Graphing NW280AAABA manual Define the functions, 8ed? 8fd?

Define the functions

The graphical and numerical data you see in Plot view and Numeric view are derived from the symbolic functions defined here.

There are 20 fields for defining functions. These are labelled X1(T) through X9(T) and X0(T), and Y1(T) through Y9(T) and Y0(T). Each X function is paired with a Y function.

2.Highlight which pair of functions you want to use, either by tapping on, or scrolling to, one of the pair. If you are entering a new function, just start typing. If

you are editing an existing function, tap and make your changes. When you have finished defining or changing the function, press E.

3.Define the two expressions.

8ed?

E

8fd?

E

Notice how the dkey enters whatever variable is relevant to the

current app. In the Function app, denters an X. In the Parametric app it enters a T. In the Polar app, discussed in chapter16, it enters θ.

4.Decide if you want to:

–give one or more function a custom color when it is plotted

–evaluate a dependent function

–deselect a definition that you don’t want to explore

–incorporate variables, math commands and CAS commands in a definition.

For the sake of simplicity we can ignore these operations in this example. However, they can be useful and are described in detail in “Common operations in Symbolic view” on page 81.

272 Parametric app