Texas Instruments TITANIUM TI-89 - Manual (Page 383)

3D Graphing 383
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 Simple Example of Moving the Cursor Simple Example of Moving the Cursor 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