Casio CLASSPAD 330 3.04 Manual de usuario Pagina 813

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14-3-1
Graphing a Second Order Differential Equation
14-3 Graphing a Second Order Differential
Equation
This section explains how to input a second order differential equation and draw a slope
field, and how to graph the solution curve(s) for a second order differential equation based
on given initial conditions.
With this application, a second order differential equation is input in the form of a set of two
first order differential equations.
Drawing the Phase Plane of a Second Order Differential Equation
A phase plane is the family of solutions of either a second order differential equation or two
first order differential equations of the form
x
=
dx
/
dt
=
f
(
x
,
y
) and
y
=
dy
/
dt
=
g
(
x
,
y
). A single
second order differential equation can also be graphed, but it must be written as two first
order differential equations.
Example: To input {
x
’ =
x
,
y
’ = −
y
} and draw its phase plane
S
ClassPad Operation
(1) On the application menu, tap .
• This starts up the Differential Equation Graph application and activates the differential
equation editor ([DiffEq] tab).
(2) Tap [Type] - [2nd (Phase Plane)] or the
toolbar button.
(3) Use the differential equation editor to input
x
’ =
x
,
y
’ = −
y
.
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