HP 39gs Graphing manual Trace a graph, To move between relations

Trace a graph

Key	Meaning (Continued)
	Turns menu-key labels on and off.
	When the labels are off, pressing
			turns them back on.
	•	Pressing					once displays the
	•	full row of			labels.
		Pressing					a second time
		removes		the row of labels to
	•	display only the graph.
		Pressing					a third time
		displays
				the		coordinate mode.

Displays the ZOOM menu list.

Turns trace mode on/off. A white box

appears over the on .

Opens an input form for you to enter an X (or T or N or θ) value. Enter the value and press . The cursor jumps to the point on the graph that you entered.

Function aplet only: turns on menu list for root-finding functions (see “Analyse graph with FCN functions” on page 3-4).

Displays the current, defining

expression. Press to restore the menu.

You can trace along a function using the or key which moves the cursor along the graph. The display also shows the current coordinate position (x, y) of the cursor. Trace mode and the coordinate display are automatically set when a plot is drawn.

Note: Tracing might not appear to exactly follow your plot if the resolution (in Plot Setup view) is set to Faster. This is because RES: FASTER plots in only every other column, whereas tracing always uses every column.

To move between relations

In Function and Sequence Aplets: You can also scroll (move the cursor) left or right beyond the edge of the display window in trace mode, giving you a view of more of the plot.

If there is more than one relation displayed, press or to move between relations.

2-8 Aplets and their views