Casio 330 - Manual (Page 822)

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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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