Texas Instruments TI-89 Manuale Utente
Differential Equation Graphing
437
4. In the Y= Editor, press:
@
2 ‰ Set
Axes = TIME
.
5. In the Window Editor (
8 $), set
the Window variables.
t0=0
tmax=10
tstep=
tmax=10
tstep=
p
/24
tplot=0
xmin=
L
1
xmax=10
xscl=5
ymin=
xscl=5
ymin=
L
10
ymax=40
yscl=5
yscl=5
ncurves=0
diftol=.001
diftol=.001
6. Graph the differential equations
(
8 %).
7. Press
…
to trace. Then press
3
¸ to
see the number of foxes (
yc
for
y1
) and
rabbits (
yc
for
y2
) at
t=3
.
Note:
Use
C and D to move the trace
cursor between the curves for
y1
and
y2
.
y2(t)
y1(t)