Differential Equation Graphing 429
If you select ZoomSqr („ 5), you can see that the phase-plane orbit is actually a circle.
However,
ZoomSqr will change your Window variables.
6. In the Y= Editor, press:
H‰
and make sure
Axes = CUSTOM with y1
and
y2 as the axes.
Important: Fields=DIRFLD cannot plot a
time axis. An
Invalid Axes error occurs if
Axes=TIME or if t is set as a CUSTOM axis.
7. In the Window Editor (8$), set
the Window variables.
t0=0
tmax=10
tstep=.1
tplot=0
xmin=
L2
xmax=2
xscl=1
ymin=L2
ymax=2
yscl=1
ncurves=0
diftol=.001
fldres=14
dtime=0
8. Display the Graph screen (8%).
x axis = y1 = y
y axis = y2 = y'
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