Texas TI-86 用户手册

10DIFFEQ.DOC   TI-86, Chap 10, US English   Bob Fedorisko   Revised: 02/13/01 2:28 PM   Printed: 02/13/01 3:02 PM   Page 135 of 20

10DIFFEQ.DOC   TI-86, Chap 10, US English   Bob Fedorisko   Revised: 02/13/01 2:28 PM   Printed: 02/13/01 3:02 PM   Page 135 of 20

10DIFFEQ.DOC   TI-86, Chap 10, US English   Bob Fedorisko   Revised: 02/13/01 2:28 PM   Printed: 02/13/01 3:02 PM   Page 135 of 20

In this editor, you can enter and display a system of up to
nine first-order differential equations, 

 through 

, if

sufficient memory is available. Equations are defined in
terms of the independent variable 

 and

àor 

.

You can refer to another differential equation variable in a

 equation, as in 

. However, you cannot enter a

list in a 

 equation.

When the TI

-86 calculates a differential equation system, it references all equations in the

equation editor, regardless of selection status, starting at 

. You must define 

 equation

variables consecutively, starting at 

. For example, if 

 and 

 are not defined, but you

attempt to solve an equation defined in 

, the calculator returns an error.

The TI

-86 allows you to analyze each equation independently. For example, you can enter

 and 

 and analyze each equation independently.

The TI

-86 graphs only those selected equations that are appropriate for the specified axes.

♦ 

The default graph style is ¼ (thick) in 

 mode.

♦ 

¾ (shade above), ¿ (shade below), and Â  (dot) are not available in 

 graphing mode.

To display the differential equation window editor, select

 from the 

GRAPH

 menu (6 '). 

 has the

same window variables as 

 graphing mode, except:

♦ 

 is not available in 

 mode.

♦ 

, 

, 

, and 

 are available in 

 mode.

♦ 

 (

) and 

 (

) are available in 

 mode.