d4r5.frm

来自「常用数值算法集哈」· FRM 代码 · 共 80 行

VERSION 5.00
Begin VB.Form Form1 
   Caption         =   "Form1"
   ClientHeight    =   2505
   ClientLeft      =   60
   ClientTop       =   345
   ClientWidth     =   4125
   LinkTopic       =   "Form1"
   ScaleHeight     =   2505
   ScaleWidth      =   4125
   StartUpPosition =   3  'Windows Default
   Begin VB.CommandButton Command1 
      Caption         =   "Command1"
      Height          =   375
      Left            =   2520
      TabIndex        =   0
      Top             =   1800
      Width           =   1335
   End
End
Attribute VB_Name = "Form1"
Attribute VB_GlobalNameSpace = False
Attribute VB_Creatable = False
Attribute VB_PredeclaredId = True
Attribute VB_Exposed = False
Private Sub Command1_ClicK()
    'PROGRAM D4R5
    'Driver for routine BETA
    Dim ACTUAL(5), W(5), Z(5)
    ACTUAL(1) = 5#
    ACTUAL(2) = 2.5
    ACTUAL(3) = 0.00036075
    ACTUAL(4) = 0.0238095
    ACTUAL(5) = 0.0000832501
    W(1) = 1#
    W(2) = 1#
    W(3) = 6#
    W(4) = 6#
    W(5) = 7#
    Z(1) = 0.2
    Z(2) = 0.4
    Z(3) = 6#
    Z(4) = 2#
    Z(5) = 7#
    Print
    Print "    W       Z      Actual       BETA(W,Z)"
    For I = 1 To 5
        Print Tab(4); Format$(W(I), "#0.0");
        Print Tab(12); Format$(Z(I), "#0.0");
        Print Tab(18); Format$(ACTUAL(I), ".000000E+00");
        Print Tab(32); Format$(BETA(W(I), Z(I)), ".000000E+00")
    Next I
End Sub
Function BETA(Z, W)
    BETA = Exp(GAMMLN(Z) + GAMMLN(W) - GAMMLN(Z + W))
End Function
   Function GAMMLN(XX)
      Dim COF(6)
      COF(1) = 76.18009173
      COF(2) = -86.50532033
      COF(3) = 24.01409822
      COF(4) = -1.231739516
      COF(5) = 0.00120858003
      COF(6) = -0.00000536382
      STP = 2.50662827465
      HALF = 0.5
      ONE = 1#
      FPF = 5.5
      X = XX - ONE
      TMP = X + FPF
      TMP = (X + HALF) * Log(TMP) - TMP
      SER = ONE
      For J = 1 To 6
          X = X + ONE
          SER = SER + COF(J) / X
    Next J
      GAMMLN = TMP + Log(STP * SER)
   End Function