📄 form1.frm
字号:
VERSION 5.00
Begin VB.Form Form1
Caption = "Form1"
ClientHeight = 3090
ClientLeft = 60
ClientTop = 450
ClientWidth = 4680
LinkTopic = "Form1"
ScaleHeight = 3090
ScaleWidth = 4680
StartUpPosition = 3 '窗口缺省
Begin VB.TextBox Text8
Height = 735
Left = 8640
TabIndex = 15
Top = 5520
Width = 1575
End
Begin VB.TextBox Text7
Height = 615
Left = 5400
TabIndex = 14
Top = 5640
Width = 1455
End
Begin VB.TextBox Text6
Height = 615
Left = 1920
TabIndex = 11
Top = 5640
Width = 1695
End
Begin VB.TextBox Text5
Height = 2655
Left = 360
MultiLine = -1 'True
ScrollBars = 2 'Vertical
TabIndex = 9
Top = 2760
Width = 7695
End
Begin VB.CommandButton Command1
Caption = "生成pearson-Ⅲ型分布的抽样样本"
Height = 495
Left = 360
TabIndex = 8
Top = 2040
Width = 7695
End
Begin VB.TextBox Text4
Height = 735
Left = 6240
TabIndex = 7
Text = "1.88"
Top = 1200
Width = 1815
End
Begin VB.TextBox Text3
Height = 615
Left = 2280
TabIndex = 5
Text = "0.75"
Top = 1200
Width = 1815
End
Begin VB.TextBox Text2
Height = 735
Left = 6120
TabIndex = 3
Text = "853.1"
Top = 120
Width = 1935
End
Begin VB.TextBox Text1
Height = 615
Left = 2280
TabIndex = 1
Text = "2000"
Top = 120
Width = 1815
End
Begin VB.Label Label7
Caption = "样本Cs值"
Height = 615
Left = 7080
TabIndex = 13
Top = 5640
Width = 1335
End
Begin VB.Label Label6
Caption = "样本Cv值"
Height = 615
Left = 3840
TabIndex = 12
Top = 5640
Width = 1335
End
Begin VB.Label Label5
Caption = "样本均值"
Height = 495
Left = 120
TabIndex = 10
Top = 5640
Width = 1455
End
Begin VB.Label Label4
Caption = "Cs"
Height = 615
Left = 4320
TabIndex = 6
Top = 1200
Width = 1695
End
Begin VB.Label Label3
Caption = "Cv"
Height = 615
Left = 240
TabIndex = 4
Top = 1200
Width = 1815
End
Begin VB.Label Label2
Caption = "EX"
Height = 615
Left = 4320
TabIndex = 2
Top = 120
Width = 1575
End
Begin VB.Label Label1
Caption = "样本容量N"
Height = 495
Left = 240
TabIndex = 0
Top = 120
Width = 1815
End
End
Attribute VB_Name = "Form1"
Attribute VB_GlobalNameSpace = False
Attribute VB_Creatable = False
Attribute VB_PredeclaredId = True
Attribute VB_Exposed = False
Option Explicit
Dim z() As Single, K() As Single, f() As Single
Private Sub Command1_Click()
Dim N As Single
Dim i As Single
Dim EX As Single
Dim Cv As Single
Dim Cs As Single
N = Val(Text1.Text)
EX = Val(Text2.Text)
Cv = Val(Text3.Text)
Cs = Val(Text4.Text)
ReDim z(N) As Single, f(N) As Single
Dim a0 As Single
Dim bata As Single
Dim alpha As Single
Dim p As Single
Dim n1 As Integer
Dim EX1 As Single
a0 = EX * (1 - 2 * Cv / Cs)
bata = 2 / (EX * Cv * Cs)
alpha = 4 / (Cs * Cs)
n1 = Int(alpha)
Dim gamma As Single
Call aa(alpha, gamma)
200
If n1 >= 1 Then
For i = 1 To N
z(i) = a0 + (y(n1) + x(n1, alpha)) / bata
Next i
Else
For i = 1 To N
z(i) = a0 + x(n1, alpha) / bata
Next i
End If
Dim s As Single
s = 0
For i = 1 To N
s = s + z(i)
Next i
EX1 = s / N
ReDim K(N) As Single
Dim b1 As Single, b2 As Single, deta As Single, Cv1 As Single, Cs1 As Single
b1 = 0
b2 = 0
For i = 1 To N
K(i) = z(i) / EX1
b1 = b1 + (K(i) - 1) ^ 2
b2 = b2 + (K(i) - 1) ^ 3
Next i
Cv1 = (b1 / (N - 1)) ^ 0.5
Cs1 = b2 / ((N - 3) * Cv1 ^ 3)
Text6.Text = CStr(EX1)
Text7.Text = CStr(Cv1)
Text8.Text = CStr(Cs1)
Dim result As String
If Abs(EX1 - EX) < EX * 0.05 And Abs(Cv1 - Cv) < Cv * 0.05 And Abs(Cs1 - Cs) < Cs * 0.05 Then
Open App.Path + "\out.txt" For Output As #3
For i = 1 To N
f(i) = bata ^ alpha * (z(i) - a0) ^ (alpha - 1) * Exp(-bata * (z(i) - a0)) / gamma
result = result + CStr(Format(z(i), "0.0000000")) + " " + CStr(Format(f(i), "0.0000000")) + Chr(13) + Chr(10)
Next i
Print #3, result
Close #3
Text5.Text = result
Else
GoTo 200
End If
End Sub
Private Function y(n1 As Integer)
Dim sumlocal As Single
sumlocal = 0
If n1 = 1 Then
sumlocal = Log(Rnd)
Else
Dim i As Single
For i = 1 To n1
sumlocal = sumlocal + Log(Rnd)
Next i
End If
y = -sumlocal
End Function
Private Function x(n1 As Integer, alpha As Single)
Dim a1 As Single
Dim a2 As Single
Dim a3 As Single
88 a1 = Rnd
a2 = Rnd
a3 = Rnd
Dim p As Single
If alpha < 1 Then
p = alpha
Else
p = alpha - n1
End If
Dim q As Single
Dim t As Single
q = 1 - p
If (a1 ^ (1 / p) + a2 ^ (1 / q)) <= 1 Then
t = (a1 ^ (1 / p)) / ((a1 ^ (1 / p) + a2 ^ (1 / q)))
Else
GoTo 88
End If
x = -t * Log(a3)
End Function
Private Sub aa(x, gamm As Single)
Dim a(11) As Double, sum As Single, X1 As Single
Dim i As Integer
a(1) = 0.0000677106: a(2) = -0.0003442342: a(3) = 0.0015397618: a(4) = -0.002446748
a(5) = 0.0109736958: a(6) = -0.0002109075: a(7) = 0.0742379071: a(8) = 0.0815782188
a(9) = 0.4118402518: a(10) = 0.422784337: a(11) = 1#
sum = 0
If x > 2 And x <= 3 Then
For i = 1 To 11
sum = sum + a(i) * (x - 2) ^ (11 - i)
Next i
ElseIf x > 1 And x <= 2 Then
For i = 1 To 11
sum = sum + a(i) * (x - 1) ^ (11 - i)
Next i
sum = sum / x
ElseIf x > 0 And x <= 1 Then
For i = 1 To 11
sum = sum + a(i) * x ^ (11 - i)
Next i
sum = sum / (x * (x + 1))
ElseIf x > 3 Then
If x = Int(x) Then
X1 = x - 3
Else
X1 = Int(x - 3) + 1
End If
For i = 1 To 11
sum = sum + a(i) * (x - X1 - 2) ^ (11 - i)
Next i
For i = 1 To X1
sum = sum * (x - i)
Next i
End If
gamm = sum
End Sub
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