Texas Instruments TITANIUM TI-89 - Manual (Page 106)

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2. Display and clear the Y= Editor . Then
define the 1st-order differential equation:
y1'(t)=.001y1…(100Ny1)
Press p to enter the … shown above. Do
not use implied multiplication between the
variable and parentheses. If you do, it is
treated as a function call.
Leave the initial condition yi1 blank.
Note: With y1' selected, the device will
graph the y1 solution curve, not the
derivative y1'.
Press 8 # , 8 ¸ ¸ .001 Y1
p c 100 | Y1 d ¸
3. Display the GRAPH FORMATS dialog box.
Then set Axes = ON , Labels = ON , Solution
Method = RK , and Fields = SLPFLD .
Note: To graph one differential equation,
Fields must be set to SLPFLD or FLDOFF .
If Fields=DIRFLD , an error occurs when
you graph.
Press 8 Í D D B 2 D D B 2 D B 1
D B 1 ¸
Steps and keystrokes Display