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 136 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 136 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 136 of 20

The values shown in the picture on page 135 are defaults in 

 mode. 

 and 

 settings

correspond to the axes variables (page 137). 

 indicates that 

, 

L

, 

, 

,

and 

 (in 

 format) or 

 (in 

 format) are beyond the screen.

Specifies the 

 value at which to begin evaluating within a graph screen

Specifies the last 

 value to evaluate within a graph screen

Specifies the increment from one 

 value to the next 

 value

Specifies the point at which plotting begins (ignored when 

 is an axis)

 (in 

 format) Specifies tolerance to help select step size for solving; must be 

‚ 1

L12

 (in 

 format) Specifies Euler iterations between 

 values; must be an integer >0 and 

 25

To display the initial conditions editor, select 

 from

the 

GRAPH

 menu (6 (). On this editor, you can set

the initial value at 

 for each first-order equation in

the equation editor.

 is the first 

 value to evaluate. 

 is the initial value of

. A small square next to an initial condition variable

indicates that a value is required for a defined differential equation.

You can enter an expression, list, or list name for initial conditions 

 and 

. When you

enter a list name, the elements are displayed when you press b, # or $.

♦ 

If 

 or 

 format is set, you need not specify initial conditions. The TI

-86

returns the appropriate field with no specific solutions.

♦ 

If 

 format is set, you must specify initial conditions.

 default is 2

p

.

 default is 

pà

24.

Initial conditions information
is stored to 

 and 

variables.