Texas Instruments TITANIUM TI-89 - Manual (Page 109)

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10. To select an initial condition interactively,
press:
2 Š
When prompted, enter t=40 and y1=45.
When selecting an initial condition
interactively, you can specify a value for t
other than the t
0
value entered in the
Y= Editor or Window Editor .
Instead of entering t and y1 after pressing
2 Š
you can move the cursor to a point on the
screen and then press
¸.
You can use … to trace curves for initial
conditions specified in the Y= Editor .
However, you cannot trace the curve for
an initial condition selected interactively.
Press 2 Š 40 ¸ 45 ¸
Steps and keystrokes Display