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The PTYPE menu within 3D (IV)
The PTYPE menu under 3D contains the following functions:
These functions correspond to the graphics options
Slopefield, Wireframe, Y-
Slice, Ps-Contour, Gridmap
and
Pr-Surface
presented earlier in this chapter.
Pressing one of these soft menu keys, while typing a program, will place the
corresponding function call in the program. Press
L
@)@3D@@
to get back to the
main 3D menu.
The VPAR menu within 3D (V)
The variable VPAR stands for Volume PARameters, referring to a
parallelepiped in space within which the three-dimensional graph of interest is
constructed. When press [VPAR] in the 3D menu, you will get the following
functions. Press
L
to move to the next menu:
Next, we describe the meaning of these functions:
INFO (S) and VPAR (W)
When you press
@INFO
(S) you get the information shown in the left-hand side
screen shot above. The ranges in
Xvol
,
Yvol
, and
Zvol
describe the extent of
the parallelepiped in space where the graph will be generated.
Xrng
and
Yrng
describe the range of values of x and y, respectively, as independent
variables in the x-y plane that will be used to generate functions of the form z
= f(x,y).
Press
L
and
@INFO
(Y) to obtain the information in the right-hand side screen
shot above. These are the value of the location of the viewpoint for the three-
dimensional graph (Xeye, Yeye, Zeye), and of the number of steps in x and y
to generate a grid for surface plots.
