Texas Instruments TI-89 User Manual

Differential Equation Graphing

 421

Setting the Initial Conditions

Setting the Initial Conditions

Setting the Initial Conditions

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

Entering Initial Conditions in the Y= Editor

Entering Initial Conditions in the Y= Editor

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 

 equation, 

use the 

 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.