Casio 300 PLUS User Guide

20050501

4-4-1

Using Trace to Read Graph Coordinates

Trace allows you move a pointer along a graph line and display the coordinates at the
current pointer location.
Starting the trace operation causes a crosshair pointer (

) to appear on the graph. You can

then press the cursor key or tap the graph controller arrows to move the pointer to the
location you want, and read the coordinates that appear on the display.

Example: To graph the function 

 = 2(

– 1)

2

 – 2 and then perform a trace operation to read

coordinates

u ClassPad Operation

(1) On the Conics Editor window, input the above equation and then tap ^ to graph it.

(2) Tap [Analysis] and then [Trace], or tap =.

• This causes “Trace” to appear on the Graph window, with a pointer on the graph line.

(3) Press the left or right cursor key, or tap the left or right graph controller arrows.

• This moves the pointer along the graph, and displays

the coordinates of the current pointer location.

• When the location of the pointer approaches the point

of infinity on a parabolic or hyperbolic graph, “Error”
appears in place of the pointer coordinates.

• You can also move the pointer to a particular point by inputting coordinates. Inputting

a value while a trace operation is being performed displays a dialog box for inputting
an 

-coordinate. After you enter a value, the pointer jumps to the corresponding

location when you tap [OK].

Here, input a value for 

 in the case of a parabola that opens horizontally. Input a

value for 

 in the case of a parabola that opens vertically. For any other type of

conics graph, input a value for 

 in order to graph in parametric format.

(4) To exit trace, tap 

 on the icon panel.

• While tracing, tapping the displayed coordinate values causes the coordinate values to appear in

the message box. You can then copy the coordinates to the clipboard.