Texas Instruments TI-89, TI-92

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 2210_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

TI-89

Keystrokes

›

TI-92 Plus

Keystrokes Display

1. Display the

MODE dialog box.

For Graph mode, select 3D.

2. Display and clear the Y= Editor.

Then define the 3D equation

z1(x,y) = (xòy ìyòx) / 390.

Notice that implied multiplication is

used in the keystrokes.

¥#

ƒ8¸

cXZ3Y

|YZ3Xd

e390¸

¥#

ƒ8¸

cXZ3Y

|YZ3Xd

e390¸

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

DB2

DB1

¥F

DB2

DB1

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„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 pto

switch

between

expanded and

normal view)

(press pto

switch

between

expanded and

normal view)

5. Animate the graph by decreasing

the eyef Window variable value.

may affect

eyeq

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

DDDD

Preview of 3D Graphing

Graph the 3D equation z(x,y) = (xòy ìyòx) / 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.