3D Graphing
388
•
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
The complex modulus surface given by
z(a,b) = abs(f(a+b
i
))
shows all the complex zeros
of any polynomial
y=f(x)
.
Example
In this example, let f(x)=x
3
+1. By substituting the general complex form x+y
i
for x, you
can express the complex surface equation as z(x,y)=abs((x+y
i)
3
+1).
1. Use
3
to set
Graph=3D
.
2. Press
8 #
, and define the equation:
z1(x,y)=abs((x+y
ù
i
)^3+1)
3. Press
8 $
, and set the Window
variables as shown.
Summary of Contents for Titanium TI-89
Page 9: ...Getting Started 6 TI 89 Titanium keys Ë Ì Í Ê ...
Page 34: ...Getting Started 31 2 or D 2 B u s i n e s s D B D B Press Result ...
Page 43: ...Getting Started 40 3 0 D B D D B D Press Result ...
Page 44: ...Getting Started 41 D 2 0 0 2 D B Scroll down to October and press Press Result ...
Page 58: ...Getting Started 55 Example Set split screen mode to TOP BOTTOM Press Result 3 B D ...
Page 70: ...Getting Started 67 ...
Page 175: ...Operating the Calculator 172 From the Keyboard ...
Page 456: ...Tables 453 ...
Page 527: ...Data Matrix Editor 524 ...
