Texas Instruments TI-89 Titanium User Manual

3D Graphing 376
Note: During rotation, the axes expand or contract to fit the screen’s width and height.
This causes some distortion as shown in the example.
z1(x,y)=(x
3
y–y
3
x) / 390
In this example,
eye
q=20 and eyef=70
eyeψ = 0
eye
ψ = 45
eye
ψ = 90
When eyeψ=0, the z axis runs the height of
the screen.
When
eyeψ=90, the z axis runs the width of
the screen.
z=10
z=
ë10
z=10
z=
ë10

Texas Instruments TI-89 Titanium Specifications

General

Display Type	LCD
Display Resolution	160 x 100 pixels
CPU	Motorola 68000
CPU Speed	16 MHz
RAM	256 KB
Flash ROM	2.7 MB
Programming Language	TI-BASIC, Assembly
Power Source	4 AAA batteries
Connectivity	I/O port
Dimensions	7.5 x 3.5 x 1 inches