Texas Instruments TI-83 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.
YFact
To zoom in on a graph, follow these steps.
1. Check and
XFact
2. Select
2:Zoom In
cursor is 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-83 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
steps 3 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
@
of 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
@X=@Y , which makes the graph of a circle look like a circle.
and remain unchanged. The midpoint of the
Xscl Yscl
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
Function Graphing 3-21
and
XFact
menu. The zoom
and repeat
and value
X Y