Texas Instruments TI-89 사용자 설명서

Differential Equation Graphing

431

Example of a 3rd-Order Equation

For the 3rd-order differential equation

y'''+2y''+2y'+y = sin(x)

, write a system of equations

to enter in the Y= Editor. Then graph the solution as a function of time. Use initial
conditions

y(0) = 0

y'(0) = 1

, and

y''(0) = 1

14. In the Window Editor, change

ymin

and

ymax

as shown to the right.

Note:

When you enter 2

-graph

mode,

Window variables for the right side are set
to their defaults.

ymin=

ymax=2.

15. Press

8 % to display the Graph

screen for graph #2.

The left side shows the phase-plane orbit.
The right side shows the solution curve
and its derivative.

16. To return to a full screen of the original

graph, press

2 a to switch to the left

side. Then press

3 and change the

Split Screen

setting.

Split Screen = FULL