Exploring A Graph With Trace - Texas Instruments TI-80 Manual Book

Exploring a Graph with TRACE

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.
Beginning a
Trace
Moving along a
Function
Panning to the
Left or Right
QuickZoom
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
screen. The number of the function appears at the upper right
of the display.
Note: If any STAT PLOTS
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
that is, Y = Y n (X) . If the function is undefined at an
Y value is blank.
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
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
Y= list at the middle
are turned on, the TI-80 attempts to
Y value is calculated from the
)
Trace cursor on the curve.
STAT PLOT
is still active.
Function Graphing 4-13
X value on the
X value;
X value, the
is on.