HP 39g+, User Manual

Page: 48 / 294

2-8 Aplets and their views
Trace a graph
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.
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.
To move between
relations
If there is more than one relation displayed, press or
to move between relations.
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.
Key Meaning (Continued)