178 Chapter 11: Differential Equation Graphing
11DIFFEQ.DOC TI-89/TI-92 Plus: Differential Equation (English) Susan Gullord Revised: 02/23/01 11:04 AM Printed: 02/23/01 2:15 PM Page 178 of 26
Overview of Steps in Graphing Differential Equations
To graph differential equations, use the same general steps
used for y(x) functions as described in Chapter 6: Basic Function
Graphing. Any differences are described on the following pages.
Graphing
Differential
Equations
Set Graph mode (3)
to DIFF EQUATIONS.
Also set Angle mode,
if necessary.
Define equations and,
optionally, initial
conditions on Y= Editor
(¥ #).
Select (†) which
defined equations to
graph.
Set the display style for
an equation.
TI-89: 2 ˆ
TI-92 Plus: ˆ
Define the viewing
window (¥ $).
Set the graph format.
Solution Method and
Fields are unique to
differential equations.
ƒ 9
— or —
TI-89: ¥ Í
TI-92 Plus: ¥ F
Set the axes as
applicable, depending
on the Fields format.
TI-89: 2 ‰
TI-92 Plus: ‰
Note: The
Fields
format is
critical, depending on the
order of the equation
(page 197).
Note: Depending on the
Solution Method
and
Fields
formats, different Window
variables are displayed.
Tip:
„ Zoom
also changes
the viewing window.
Note: Valid
Axes
settings
depend on the
Fields
format
(pages 190 and 197).
Graph the equations
(¥ %).
Tip: To turn off any stat
data plots, press
‡ 5
or
use
†
to deselect them.
Refer to Chapter 16.