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144
Chapter 10: Differential Equation Graphing
To paste
to the home
'
screen, you can select it from
the
menu or from
CHAR MISC
the
CATALOG
.
Due to TI-86 system
requirements, you must
express
as
on
Q1(3)
Q'1(3)
the calculator.
QuickZoom is available in
graphing; panning is
DifEq
not (Chapter 6).
Solving a Differential Equation for a Specified Value
On the home screen in
DifEq
differential equation stored to a specified independent variable
value or expression. The syntax is:
The equation must be stored to a
(
through
).
Q'1
Q'9
The initial conditions must be defined.
The result sometimes varies, depending on the axes settings.
Using Graph Tools in DifEq Graphing Mode
The Free-Moving Cursor
The free-moving cursor works in
coordinate values for
x
Tracing a Differential Equation
To begin a trace, select
appears on the first equation at or near
The trace coordinates displayed at the bottom of the screen reflect the axes settings. For
example, if
and
x=t
y=Q1
are displayed. If
is an axis, only
t
The trace cursor moves in increments or decrements of
coordinates are updated and displayed. If the cursor moves off the screen, the coordinate
values displayed at the bottom of the screen continue to change appropriately.
graphing mode, you can solve a
n
value
.
Q'
(
)
equation variable
DifEq
mode as it does in
DifEq
and
are displayed, and the variables are updated.
y
from the
TRACE
GRAPH
(or
tPlot
, then
and
are displayed. If
t
Q1
and the variable designated as the y-axis are displayed.
t
graphing. The cursor
Func
menu (6 / )). The trace cursor
, if
is an axis).
tMin
t
is not an axis, three trace values
t
. As you trace an equation, the
tStep
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