Operation Manual

Function Graphing 3-17
8203FUNC.DOC TI-82, Chapter 3, English Bob Fedorisko Revised: 02/09/01 9:06 AM Printed: 02/09/01
12:36 PM Page 17 of 24
Zoom In, Zoom Out
Zoom In
magnifies the graph around the cursor location.
Zoom Out
displays a greater portion of the graph, centered on the cursor location, to
provide a more global view. The
XFact
and
YFact
settings determine the
extent of the zoom.
1. After checking or changing
XFact
and
YFact
(page 3
.
20), 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
, then press
Í
.
The TI
.
82 adjusts the viewing
WINDOW
by
XFact
and
YFact
, updates
the
WINDOW
variables, and replots the selected functions, centered on
the cursor location.
3. To zoom in on the graph again:
¦
To zoom in at the same point, press
Í
.
¦
To zoom in at a new point, move the cursor to the point that you
want as the center of the new viewing
WINDOW
and then press
Í
.
Zoom Out
The procedure for
Zoom Out
is the same as for
Zoom In
.
Leaving Zoom In or Zoom Out
To leave
Zoom In
or
Zoom Out
:
¦
Select another screen by pressing the appropriate key, such as
r
or
s
.
¦
Press
y
ã
QUIT
ä
to return to the Home screen.