Texas Instruments TI-82 STATS Manual Book page 97

Zoom In,
Zoom Out
ZDecimal
ZSquare
magnifies the part of the graph that surrounds the
Zoom In
cursor location.
Zoom Out
graph, centered on the cursor location. The
settings determine the extent of the zoom.
To zoom in on a graph, follow these steps.
1. Check and
XFact
2. Select
2:Zoom In
displayed.
3. Move the zoom cursor to the point that is to be the center of
the new viewing window.
4. Press Í. The TI-82 STATS adjusts the viewing window
by and
XFact YFact
replots the selected functions, centered on the cursor
location.
5. Zoom in on the graph again in either of two ways.
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.
To zoom out on a graph, select
through 5.
To cancel
Zoom In
replots the functions immediately. It updates the
ZDecimal
window variables to preset values, as shown below. These
values set and
X
@ @
each pixel to one decimal place.
Xmin=L4.7
Xmax=4.7
Xscl=1
replots the functions immediately. It redefines the
ZSquare
viewing window based on the current values of the window
variables. It adjusts in only one direction so that
makes the graph of a circle look like a circle.
remain unchanged. The midpoint of the current graph (not the
intersection of the axes) becomes the midpoint of the new graph.
displays a greater portion of the
(page 3.24); change as needed.
YFact
from the
ZOOM
; updates the window variables; and
3:Zoom Out
, press '.
or
Zoom Out
equal to and set the
Y 0.1
Ymin=L3.1
Ymax=3.1
Yscl=1
and
XFact YFact
menu. The zoom cursor is
and repeat steps 3
and value of
X Y
, which
@X=@Y
and
Xscl Yscl
Function Graphing 3.21