Texas Instruments Titanium TI-89, User Manual

Page: 429 / 977

Differential Equation Graphing 426
2. Express the 1st-order equation in terms of
y1'
and
y1
.
y1'=.001y1
ù
(100
N
y1)
3. Enter the equation in the Y= Editor
(
8 #
).
4. Enter the initial condition:
yi1=10
5. Press:
,
9
— or —
@ 8
Í
Set
Solution Method = RK
and
Fields = FLDOFF
.
Note:
To speed up graphing times, clear
any other equations in the Y= Editor. With
FLDOFF
, all equations are evaluated even
if they are not selected.
6. In the Window Editor (
8 $
), set
the Window variables.
Do not use implied
multiplication
between the variable
and parentheses. If
you do, it is treated
as a function call.
t0 is the time at
which the initial
condition occurs.
By default, t0=0.