?? 歐拉法.frm
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VERSION 5.00
Begin VB.Form Form18
BackColor = &H00FFFFFF&
Caption = "歐拉法"
ClientHeight = 8700
ClientLeft = 60
ClientTop = 345
ClientWidth = 10935
LinkTopic = "Form23"
ScaleHeight = 8700
ScaleWidth = 10935
StartUpPosition = 3 '窗口缺省
Begin VB.CommandButton Command1
Caption = "歐拉法"
BeginProperty Font
Name = "宋體"
Size = 10.5
Charset = 134
Weight = 700
Underline = 0 'False
Italic = 0 'False
Strikethrough = 0 'False
EndProperty
Height = 495
Left = 960
TabIndex = 0
Top = 1080
Width = 1215
End
End
Attribute VB_Name = "Form18"
Attribute VB_GlobalNameSpace = False
Attribute VB_Creatable = False
Attribute VB_PredeclaredId = True
Attribute VB_Exposed = False
Private Sub Command1_Click()
'衛星的運動方程
' y1'=y3
' y2'=y4
' y3'=y1+2y4-v(y1+u)/r1^3-u(y1-v)/r2^3
' y4'=y2-2y3-vy2/r1^3-vy2/r2^3
'其中v=1-u,r1=[(y1+u)^2+y2^2]^(1/2),r2=[(y1-v)^2+y2^2]^(1/2)
Rem 輸出坐標軸
Dim y1(2), y2(2)
T = 6.2
y1(1) = 1.2
y2(1) = 0
y3 = 0
y4 = -1.04936
u = 0.012129
v = 1 - u
h = InputBox("請輸入h:", "")
h = Val(h)
n = T / h
Cls
x0 = 7000
y0 = 5000
Line (200, y0)-(15000, y0)
Line (x0, 500)-(x0, 9000)
t0 = 2000
i = 2
Do While i <= n
r1 = Sqr((y1(1) + u) * (y1(1) + u) + y2(1) * y2(1))
r1 = r1 ^ 3
r2 = Sqr((y1(1) - v) * (y1(1) - v) + y2(1) * y2(1))
r2 = r2 ^ 3
y1(2) = y1(1) + h * y3
y2(2) = y2(1) + h * y4
y3 = y3 + h * (y1(1) + 2 * y4 - v * (y1(1) + u) / r1 - u * (y1(1) - v) / r2)
y4 = y4 + h * (y2(1) - 2 * y3 - v * y2(1) / r1 - u * y2(1) / r2)
Line (x0 + y1(1) * t0, y0 - y2(1) * t0)-(x0 + y1(2) * t0, y0 - y2(2) * t0)
y1(1) = y1(2)
y2(1) = y2(2)
i = i + 1
Loop
i = 1
Do While i <= n - 1
i = i + 1
Loop
End Sub
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