HP 49g Graphing Calculator - Manual (Page 89)

Plot window parameters
X-Left, X-Right The a;-axis range—or width—of the view volume.
Y-Near, Y-Far The
y-axis
range—or depth—of the view volume.
Z-Low, Z-High The z-axis range—or height—of the view volume.
XE The
X
coordinate of the eyepoint.
YE The
y
coordinate of the eyepoint.
ZE The
z
coordinate of the eyepoint.
Step Indep The number of columns in the sampling grid.
Step Depnd The number of rows in the sampling grid.
Plot setup parameters
Type
EQ
Indep
Depnd
The type of plot (in this case,
wireframe).
The angle miits field indicates the imits in which angular
arguments are to be interpreted: degrees, radians, or
gradians.
The equation or list of equations you want to plot.
The name of one of the independent variables.
The name of the second independent variable.
Pseudo-Contour plots
A pseudo-contour plot is a lattice of line segments each tangent to a
contour of a fimction (a curve satisfying
F(x,y) =
constant).
A pseudo-contour plot needs two inputs to generate an output. The
HP 49G uses a two-dimensional
.mmpling grid
of points whose
coordinates provide the two inputs required. By default, the sampling grid
consist of 80 points: 10 columns by 8 rows. In drawing a pseudo-contour
plot, the HP 49G computes a tangent for each point in tire sampling grid.
The pseudo-contour plot type produces a fast contour plot, enabling your
eye to pick out the integral curves without actually plotting them.
The following example is a pseudo-contour plot of z = y - ry‘ .
Plotting graphs Page 4-21