Texas Instruments TITANIUM TI-89 User Manual
Page 379

3D Graphing
379
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)