Texas Instruments Titanium TI-89, Руководство пользователя

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Differential Equation Graphing 407
Setting the Initial Conditions
You can enter initial conditions in the Y= Editor, let the TI-89 Titanium calculate initial
conditions automatically, or select them interactively from the Graph screen.
Entering Initial Conditions in the Y= Editor
You can specify one or more initial conditions in the Y= Editor. To specify more than one,
enter them as a list enclosed in braces { } and separated by commas.
For a 2nd- or higher-order differential equation, you must define a system of 1st-order
equations in the Y= Editor.
To enter initial conditions for the
y1'
equation,
use the
yi1
line, etc.
If you enter initial conditions, you must enter
the same number of initial conditions for each
equation in the system. Otherwise, a
Dimension error occurs.
To specify when the initial conditions occur,
use t0. This is also the first t evaluated for
the graph.
To graph a family of solutions, enter a list of
initial conditions.
Enter {10,20} even
though {10 20} is
displayed.