Texas Instruments TI-89 사용자 설명서

3D Graphing

377

Differences in 3D and Function Graphing

This module assumes that you already know how to graph

y(x)

functions as described in

Basic Function Graphing. This section describes the differences that apply to 3D
equations.

Setting the Graph Mode

Use

3 to set

Graph = 3D

before you define equations or set Window variables. The

Y= Editor and the Window Editor let you enter information for the current Graph mode
setting only.

Defining 3D Equations on the Y= Editor

The Y= Editor maintains an independent function list for each Graph mode setting. For
example, suppose:

•

In FUNCTION graphing mode, you define a set of

y(x)

functions. You change to 3D

graphing mode and define a set of

z(x,y)

equations.

You can define 3D equations
for z1(x,y) through z99(x,y).