Texas Instruments TITANIUM TI-89 User Manual page 379

Variable Description
xmin, xmax, Boundaries of the viewing cube.
ymin, ymax,
zmin, zmax
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
ncontour The number of contours evenly distributed along the
displayed range of z values.
3D Graphing
xmax xmin –
-------------------------------- -
xgrid
ymax ymin
–
-------------------------------- -
ygrid
15) grid points.
z(xmin,ymin)
z(xmax,ymin)
z(xmin,ymax)
z(xmax,ymax)
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