Texas Instruments Titanium TI-89, User Manual

Page: 372 / 977

3D Graphing 369
Note:
You can move the cursor only within the x and y boundaries set by Window
variables
xmin
,
xmax
,
ymin
, and
ymax
.
Although the rules are straightforward, the actual cursor movement can be confusing
unless you know the orientation of the axes.
Note:
To show the axes and their labels from the Y= Editor, Window Editor, or Graph
screen, use:
8
Í
Simple Example of Moving the Cursor
The following graph shows a sloped plane that has the equation z1(x,y) =
‘M
(x + y) / 2.
Suppose you want to trace around the displayed boundary.
In 2D graphing, the x and y axes always
have the same orientation relative to the
Graph screen.
In 3D graphing, x and y have a different
orientation relative to the Graph screen.
Also, you can rotate and/or elevate the
viewing angle.
eye q =20 eye f =70 eye
ψ
=0