Texas Instruments TI-89 사용자 설명서

3D Graphing

 402

•

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, 
display the Graph Formats dialog box and set Style=CONTOUR LEVELS or WIRE 
AND CONTOUR.

8 Í 

Example: Contours of a Complex Modulus Surface

Example: Contours of a Complex Modulus Surface

Example: Contours of a Complex Modulus Surface

Example: Contours of a Complex Modulus Surface

The complex modulus surface given by 

z(a,b) = abs(f(a+bi))

 shows all the complex zeros 

of any polynomial 

.

Example

Example

Example

Example

In this example, let f(x)=x

3

+1. By substituting the general complex form x+y

 for x, you 

can express the complex surface equation as z(x,y)=abs((x+y

i)

3

+1).

1. Use 

3 to set 

.

2. Press 

8 #, and define the equation:

z1(x,y)=abs((x+y

ù

)^3+1)

3. Press 

8 $, and set the Window 

variables as shown.