Tvpe: |¡jhyyh"g)¿hi rad e(î: ' x'“'3*y-x*y-''3, Injuiga?hgiamibi – HP 48G User Manual
Page 74
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Note that the three-dimensional coordinate system on the HP 48
is somewhat constrained compared to its abstract, mathematical
counterpart. Specihcally:
■ The plot display screen does not rotate in space; it always stays
parallel to the ?;z-plane and perpendicular to the
y - a x i s .
This means
that,
visually, “height”
is
always along the r-axis, “width” along the
;r-a.xis, and “depth” along the
y - a x i s .
m
The
y - a x i s
is always oriented so that negative y-values are “nearer”
and positive j/-values “farther” away from the plot display.
B The eyepoint must be at least one unit “nearer” than
y n e a r
{ V e
<
U n e a r ~
1) and Can never exist “within” the View Volume.
Whenever you move the eyepoint, you also move the plot display
screen so that it remains exactly one unit awa,y in the direction of
the «/-axis.
■ Vou cannot plot a “top” view of a function (looking down onto the
.7;;y-plane) simply by moving the eyepoint. (You may simulate this
b}' transforming coordinates, however.)
Example:
Plot a wireframe view of:
f { X , Y ) = X ^ Y - X Y ^
S t e p 1 :
Change the plot type to Wi ref rane and enter the function.
® ©w (5
CD®
x
E|3(
x
)©
y
0©
x
® ©Y (23 3 (ENTER)
PLDTfc®
TVPE: Nireframe Rad
' X”’3*V-X*Y“-3'
INOEP:
STEPS: 10
BEPND:
Y
STEPS: 3
ENTER INDEPENDENT VAR NAME_____
S t e p 2 :
Set the number of horizontal and vertical
steps
(or “frames”)
to plot.
(© 12 (ENTER) (S 12 fENW)
PlOTj
TVPE:
|¡jHyyH"g)¿Hi Rad
E(î:
' X'“'3*Y-X*Y-''3 '
INDEP: X
STEPS: 12
tiEPND:Y
STEPS: 12
CHnnSE TYPE OF PLOT______________
injuiga?HgiamiBi
6-8 Plotting Equations and Analyzing Graphs