Preview of 3d graphing – Texas Instruments PLUS TI-89 User Manual

Page 171

154 Chapter 10: 3D Graphing

10_3D.DOC TI-89/TI-92 Plus: 3D Graphing (English) Susan Gullord Revised: 02/23/01 11:00 AM Printed: 02/23/01 4:22 PM Page 154 of 22

Steps

Keystrokes

›

92 Plus

Keystrokes

Display

1. Display

the

MODE

dialog box.

For

Graph

mode, select

3
B 5
¸

2. Display and clear the Y= Editor.

Then define the 3D equation

z1(x,y) = (x

x) / 390

Notice that implied multiplication is
used in the keystrokes.

¥ #
ƒ 8 ¸
¸
c X Z 3 Y
| Y Z 3 X d
e 3 9 0 ¸

3. Change the graph format to

display and label the axes. Also
set

Style = WIRE FRAME

You can animate any graph format
style, but WIRE FRAME is fastest.

¥ Í
D B 2
D B 2
D B 1
¸

¥ F
D B 2
D B 2
D B 1
¸

4. Select

the

ZoomStd

viewing

cube, which automatically
graphs the equation.

As the equation is evaluated (before it
is graphed), “evaluation percentages”
are shown in the upper-left part of the
screen.

„ 6

Note: If you have already used 3D
graphing, the graph may be shown in
expanded view. When you animate
the graph, the screen returns to
normal view automatically. (Except for
animation, you can do the same
things in normal and expanded view.)

(press p to
switch
between
expanded and
normal view)

5. Animate the graph by decreasing

the

eye

Window variable value.

may affect eye

and eye

, but

to a lesser extent than eye

To animate the graph continuously,
press and hold the cursor for about 1
second and then release it. To stop,
press

D D D D
D D D D

Preview of 3D Graphing

Graph the 3D equation z(x,y) = (x

x) / 390. Animate the graph by using the cursor

to interactively change the eye Window variable values that control your viewing angle.
Then view the graph in different graph format styles.

This manual is related to the following products:

PLUS TI-92