Texas Instruments TI-89 Manuel D’Utilisation

Texas Instruments

Differential Equation Graphing

433

6. Press:

,

9

— or —

@

8 ÍSet

Axes = ON

,

Labels = ON

,

Solution Method = RK

, and

Fields = FLDOFF

.

Important:

For 3rd- or higher-order

equations, you must set

Fields=FLDOFF

.

Otherwise, an

Undefined variable

error

occurs when graphing.

7. In the Y= Editor, press:

@

2 ‰ Set

Axes = TIME

.

Note:

With

Axes=TIME

, the solution to the

selected equation is plotted against time
(t).

8. In the Window Editor (

8 $), set

the Window variables.

t0=0
tmax=10
tstep=.1
tplot=0

xmin=

L

1

xmax=10
xscl=1.
ymin=

L

3

ymax=3
yscl=1

ncurves=0
diftol=.001