Defining A Custom Zoom In; Setting Zoom Factors; Zooming In And Zooming Out On A Graph - Texas Instruments TI-86 Manual Book

Before you begin these
steps, enter a function in the
equation editor. In the
example, the function
2 is graphed.
y(x)=x^3+.3x N4x
To cancel without
BOX
redefining the graph screen,
press : .
When you replot the graph,
the TI-86 updates the window
variable values.
To store to or
xFact yFact
from the home screen or in
the program editor, you can
select it from the VARS ALL
screen or enter it using
ALPHA and alpha keys.

Defining a Custom Zoom In

Using , you can zoom in on any rectangular area within the current graph screen.
BOX
Select from the
BOX GRAPH ZOOM
zoom cursor is displayed at center screen.
Move the cursor to any spot you want to define
as a corner of the zoom box; mark the corner
with a small square.
Move the cursor away from the first corner,
creating an adjustable box whose diagonal
corners are the small square and the cursor.
When you have defined the box, replot all
selected functions in the new graph screen.
Clear the menus from the screen.

Setting Zoom Factors

Zoom factors define the magnification or reduction factor by which
zoom in or zoom out around a point. To display the zoom factors editor, select
ZOOMY
from the
ZFACT GRAPH ZOOM
be ‚ 1. The default value for both factors is

Zooming In and Zooming Out on a Graph

magnifies the part of the graph surrounding the cursor location.
ZIN
portion of the graph, centered on the cursor location.
The steps below describe how to use
6 (
menu. The
&
" # ! $
b
" # ! $
b
:
menu (press 6 ( / / ').
in all graphing modes.
4
. To use
ZIN ZOUT
Chapter 6: Graph Tools
,
ZIN ZOUT
and
xFact
displays a greater
ZOUT
and determine the extent.
xFact yFact
, select it instead of
ZIN
93
, , and
ZOOMX
must
yFact
in step 2.