Casio CLASSPAD 330 3.04 User Manual page 814

(4) Tap .
• This draws the phase plane of x ' = x , y ' = − y .
Inputting Initial Condition and Graphing the Solution Curve of a Second
Order Differential Equation
You can use the procedure in this section to overlay, onto the slope field, solution curve of
the second order differential equation input on the [DiffEq] tab for given initial conditions.
Example: To input the second order differential equation { x ' = x , y ' = − y }, draw the phase
plane, and then graph the solution curve of the initial condition ( xi , yi ) = (1, 1)
The independent variable minimum value ( t min) = −7.7, maximum value ( t max) =
7.7, and initial value ( t 0) = 0.
Cla Pad Operation
(1) Use the procedure under "Drawing the Phase Plane of a Second Order Differential
Equation" on page 14-3-1 to draw the phase plane for { x ' = x , y ' = − y }.
(2) Activate the Differential Equation Editor window and then tap the [IC] tab.
• This displays the initial condition editor.
(3) Input ( xi , yi ) = (1, 1) into the initial condition editor.
Select the check box next to " xi =" and then tap
14-3-2
Graphing a Second Order Differential Equation
[Edit] - [Redraw]
.
20060301