HP Prime Graphing NW280AAABA manual To evaluate a definition To turn tracing on or off

To evaluate a definition

To turn tracing on or off

One of the primary uses of the trace functionality is to evaluate a plotted definition. Suppose in Symbolic view you have defined 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 (P).

2.If the menu at the bottom of the screen is not open, tap

.

3.If more than one definition is plotted, ensure that the trace cursor is on the plot of the definition you want to evaluate.

You can press to see the definition of a plot, and press =or \to move the trace cursor from plot to plot.

4.If you pressed to see the definition of a plot, the menu

at the bottom of the screen will be closed. Tap to re- open it.

5.Tap .

6.Enter 25 and tap .

7.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 provides for you to evaluate a function for a specific independent variable. You can also evaluate a function in

Numeric view (see page 102). Moreover, any expression you define in Symbolic view can be evaluated in Home view. For example, suppose F1(X)is defined as (x – 1)2 – 3. If you enter F1(4) in Home view and press Eyou get 6, since (4– 1)2 – 3 = 6.

•To turn off tracing, tap .

•To turn on tracing, tap .

If these options are not displayed, tap .

When tracing is off, pressing the cursor keys no longer constrains the cursor to a plot.

An introduction to HP apps 95