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4-4-1
Using Trace to Read Graph Coordinates
4-4 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.
Using Trace
Example: To graph the function
x
= 2(
y
– 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 a pointer to appear 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
a value. After you enter a value, the pointer jumps to the corresponding location when
you tap [OK].
Here, input a value for
yc
in the case of a parabola that opens horizontally. Input a
value for
xc
in the case of a parabola that opens vertically. For any other type of
conics graph, input a value for
tc
in order to graph in parametric format.
(4) To exit trace, tap
on the icon panel.
Tip
• 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.