Notes about implicit plots – Texas Instruments PLUS TI-89 User Manual

Page 189

172 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 172 of 22

The viewing angle is set initially so that you are viewing the plot
by looking down the z axis. You can change the viewing angle as
necessary.

The plot is shown in expanded view. To switch between
expanded and normal view, press p.

The

Labels

format is set to

OFF

automatically.

Style

с м

z1(x,y)=x

с м

sin(x)+cos(y)=

z1(x,y)=sin(x)+cos(y)

ì e

IMPLICIT
PLOT

For an implicit plot:

The

ncontour

Window variable (page 168) has no affect. Only the

z=0 contour is drawn, regardless of the value of

ncontour

. The

displayed plot shows where the implicit form intersects the
xy plane.

You can use the cursor keys (page 164) to animate the plot.

You cannot trace (

… ) the implicit plot itself. However, you can

trace the unseen wire frame graph of the 3D equation.

It may take awhile to evaluate the equation initially.

Because of possible long evaluation times, you first may want to
experiment with your 3D equation by using

Style=WIRE FRAME

The evaluation time is much shorter. Then, after you’re sure you
have the correct Window variable values, set

Style=IMPLICIT PLOT

89:

¥ Í

92 Plus

Note: These examples use
the same x, y, and z
Window variable values as a
ZoomStd viewing cube. If
you use ZoomStd, press Z
to look down the z axis.

Notes About
Implicit Plots

This manual is related to the following products:

PLUS TI-92