Texas Instruments TITANIUM TI-89 User Manual page 440

2. Express the 1st-order equation in terms of
and .
y1' 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
Fields = FLDOFF
To speed up graphing times, clear
Note:
any other equations in the Y= Editor. With
, all equations are evaluated even
FLDOFF
if they are not selected.
6. In the Window Editor (8 $), set
the Window variables.
Differential Equation Graphing
and
.
ù
y1'=.001y1 (100 y1)
N
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.
440