4-16 Function Graphing
ZOOM IN magnifies the graph around the cursor location. The
XFACT and YFACT settings determine the extent of the zoom
(page 4-18). The default value for both XFACT and YFACT is
4.
1. After checking or changing XFACT and YFACT, select
ZOOM IN from the ZOOM menu.
Notice the different cursor. It indicates that you are using
a Zoom instruction.
2. Move the cursor to the point that you want as the center of
the new viewing window, and then press ¸.
The TI-80 adjusts the viewing window by XFACT and
YFACT, updates the Window variables, and replots the
selected functions centered on the cursor location.
3. ZOOM IN is still turned on. To zoom in on the graph again:
¦At the same point, press ¸.
¦At a new point, move the cursor to the point that you
want as the center of the new viewing window, and then
press ¸.
ZOOM OUT displays a greater portion of the graph, centered
on the cursor location, to provide a more global view. The
procedure for ZOOM OUT is the same as for ZOOM IN.
To leave ZOOM IN or ZOOM OUT:
¦Select another screen by pressing the appropriate key,
such as + or ,.
¦Press 2 . to return to the Home screen.
ZOOM IN
ZOOM OUT
Leaving ZOOM
IN or ZOOM OUT