Casio ClassPad II fx-CP400 Examples User Manual
Page 20
Chapter 5: Differential Equation Graph Application
20
0503
1. On the Differential Equation Editor window, tap [Type] - [2nd (Phase Plane)] or
B.
2.
Xw-Yw
3. Tap
O to draw the phase plane.
0504
1. Activate the Differential Equation Editor window and then tap the [IC] tab.
• This displays the initial condition editor.
2. Input (
xi
,
yi
) = (1, 1) on the initial condition editor.
3. Tap
O.
• This graphs the solution curve and overlays it on the phase plane of
x
’ =
x
,
y
’ = −
y
.
0505
1. On the Differential Equation Editor window, tap [Type] - [Nth (No Field)] or
9.
2. Input
y
’’ =
x
−
y
by dividing it into two first order differential equations. If
we let
y
1 =
y
and
y
2 =
y
’, we see that
y
1’ =
y
’ =
y
2 and
y
2’ =
y
’’ =
x
−
y
1.
Ycw
X-Ybw
3. Tap the [IC] tab to display the initial condition editor.
4. Input (
xi
,
y
1
i
,
y
2
i
) = (0, −1, 0), (0, 0, 0), (0, 1, 0).
5. Tap
O.
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