Справочник Пользователя для Texas TI-86

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 139 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 139 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 139 of 20

In 

 graphing mode, 

 is the independent variable and 

 is the equation variable. To avoid

conflict between 

 equations and 

 equations on the TI

-86, 

 is the independent

variable and 

 is the equation variable in 

 graphing mode. Therefore, when you enter

an equation in the differential equation editor, you must express it in terms of 

 and 

.

For example, to express the first-order differential equation y'=x

2

, you would substitute 

for x

2

 and 

 for y', and then enter 

 in the equation editor.

�   Display the mode screen and set 

graphing mode.

- m # # #
# " " " b

�   Display the format screen and set 

field format.

6 / & #
# # # # b

�   Display the equation editor and store the

differential equation y'=x

2

, substituting 

for y' and 

 for x. Clear any other

equations.

& & I

�   Display the initial conditions editor and

enter the initial conditions. A small square
indicates that an initial condition is required.

- g 

In the example, the default
window variable values are
set initially.