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146

Chapter 10: Differential Equation Graphing

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 146 of 20

xList

, yList, and tList are optional list names to which you can store the solutions

, and

. You then can display the lists on the home screen or in the list editor (Chapter 11).

Use the free-moving cursor to select initial conditions.

You cannot trace the drawing. However, you can plot xList, yList, or tList as a stat plot
after you draw the equation, and then trace them (Chapter 14). Also, you can fit statistical
regression models to the lists (Chapter 14).

� Display the mode screen and set

DifEq

graphing mode.

- m # # #
# " " " b

� Display the format screen and set

DirFld

field format.

6 / & #
# # # # "
b

� Display the equation editor and store the

equations

Q'1=Q2

and

Q'2=

. (Delete

all other equations.)

& '

# a '

� Remove the format screen, and then select

DrEqu

from the

GRAPH

DRAW

menu.

DrEqu(

is pasted to the home screen.

. . 6
/ ' &

� Assign variables to the x- and y-axes.

� Specify list names to which to store the

solution lists for

, and

1 ã

ä 1 ã

P 1 ã

ä 1

ä P 1 ã

1 ã

ä E

DrEqu(

does not store values

, or

In the example, the default
window variable values are
set. If necessary, select

ZSTD

from the

GRAPH

ZOOM

menu.

If you select

FldOff

field

format, you must enter initial
conditions before you use

DrEqu(