Texas Instruments TI-89 Titanium User Manual

3D Graphing 365
xmin, xmax,
ymin, ymax,
zmin, zmax
Boundaries of the viewing cube.
xgrid, ygrid The distance between xmin and xmax and between ymin
and ymax is divided into the specified number of grids. The
z(x,y) equation is evaluated at each grid point where the
grid lines (or grid wires) intersect.
The incremental value along x and y is calculated as:
x increment =
y increment =
The number of grid wires is xgrid + 1 and ygrid + 1. For
example, when xgrid = 14 and ygrid = 14, the xy grid
consists of 225 (15 × 15) grid points.
ncontour The number of contours evenly distributed along the
displayed range of z values.
Variable Description
xmax xmin–
xgrid
---------------------------------
ymax ymin–
ygrid
---------------------------------
z
(
xmin,ymax
)
z(xmin,ymin)
z(xmax,ymin)
z(xmax,ymax)

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