Texas Instruments TI-89 Manuale Utente

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.

The number of contours evenly distributed along the 
displayed range of z values. 

xmax xmin

–

xgrid

---------------------------------

ymax ymin

–

ygrid

---------------------------------

z(xmin,ymax)

z(xmin,ymin)

z(xmax,ymin)

z(xmax,ymax)