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Function Graphing 4-13
TRACE moves the cursor from one plotted point to the next along a function.
The cursor coordinates are displayed at the bottom of the screen.
Press
+
to begin a trace. If the graph is not displayed
already, the TI
-
80 displays it. The cursor is on the first
selected function in the
Y=
list at the middle
X
value on the
screen. The number of the function appears at the upper right
of the display.
Note: If any
STAT PLOTS
are turned on, the TI
-
80 attempts to
trace the first stat plot.
Press
9
and
6
to move the cursor along the function. Each
press moves the cursor from one plotted point to the next.
Press
2
9
and
2
6
to move the cursor five plotted points
at a time. Tracing updates and displays the values of the
variables
X
and
Y
. The
Y
value is calculated from the
X
value;
that is,
Y
=
Y
n
(X)
. If the function is undefined at an
X
value, the
Y
value is blank.
)
Trace cursor on the curve.
If the
Y
value of a function is above or below the viewing
window, the cursor disappears as you move it to that portion
of the function. However, the coordinate values at the bottom
of the screen indicate the cursor coordinates.
If you trace a function off the left or right edge of the screen,
the viewing window automatically pans to the right or left.
XMIN
and
XMAX
are updated to correspond to the new
viewing window.
Note: The screen does not pan if a
STAT PLOT
is on.
While tracing, you can press
¸
to adjust the viewing
window so that the cursor location becomes the center of a
new viewing window, even if the cursor is above or below the
display. This allows “panning” up and down. After
QuickZoom,
TRACE
is still active.
Exploring a Graph with TRACE
Beginning a
Trace
Moving along a
Function
Panning to the
Left or Right
QuickZoom