HP 49g Graphing Calculator - Manual (Page 95)

Standard 3-D functions can be plotted using the Fast 3-D plot type.
A Fast 3-D plot needs two inputs to generate an output. The HP 49G uses a
two-dimensional sampling grid of points whose coordinates provide the
two inputs required. By default, the sampling grid consist of 80 points: 10
columns by 8 rows.
The following is a Fast 3-D plot of z = x y - .ry" .
Fast 3-D plots
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Figure 4-27: DeFault plot window and plot setup parameters for Fast 3-D plots
Figure 4-28: Sample Fast 3-D plot
You can rotate a Fast 3-D plot by pressing the arrow keys, or the
keys.
and
Plot window parameters
X-Left, X-Right The horizontal display range corresponding to the first
independent variable (entered in the Indep field).
Y-Near, Y-Far The vertical display range corresponding to the second
independent variable (entered in the Depnd field).
Z-Low, Z-High The «-axis range—or height—of the view volume.
Step Indep The number of columns in the sampling grid.
Step Depnd The number of rows in the sampling grid.
Plotting graphs Page 4-27