Texas Instruments TITANIUM TI-89 User Manual page 429

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