Texas Instruments PLUS TI-89 - Manual (Page 195)

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.