Texas Instruments TI-89 Manual De Usuario
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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:
@
2 ‰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
tmax=10
tstep=.1
tplot=0
xmin=
L
2
xmax=2
xscl=1
ymin=
xscl=1
ymin=
L
2
ymax=2
yscl=1
yscl=1
ncurves=0
diftol=.001
fldres=14
dtime=0
diftol=.001
fldres=14
dtime=0
8. Display the Graph screen (
8 %).
x axis = y1 = y
y axis = y2 = y'