Texas Instruments Titanium TI-89 User Manual

3D Graphing 398
format as it does if you use:
8 Í
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. Do not confuse the
contours with the grid lines. The contours are darker.
Style
z1(x,y)=(x
3
y–y
3
x) / 390 z1(x,y)=x
2
+.5y
2
–5
Looking down z axis
CONTOUR
LEVELS
Using eye
q=20, eyef=70, eyeψ=0
CONTOUR
LEVELS
WIRE AND
CONTOUR

Texas Instruments Titanium TI-89 Specifications

General

Display Type	LCD
Display Resolution	160 x 100 pixels
Memory	188 KB RAM, 2.7 MB Flash ROM
Type	Graphing Calculator
Display	Monochrome
Processor	Motorola 68000
Processor Speed	12 MHz
Power Source	4 AAA batteries
Connectivity	USB
Programming	TI-BASIC, Assembly
Operating System	AMS (Advanced Mathematics Software)