d4r1.frm

来自「常用数值算法集哈」· FRM 代码 · 共 72 行

VERSION 5.00
Begin VB.Form Form1 
   Caption         =   "Form1"
   ClientHeight    =   2850
   ClientLeft      =   60
   ClientTop       =   345
   ClientWidth     =   3750
   LinkTopic       =   "Form1"
   ScaleHeight     =   2850
   ScaleWidth      =   3750
   StartUpPosition =   3  'Windows Default
   Begin VB.CommandButton Command1 
      Caption         =   "Command1"
      Height          =   375
      Left            =   1920
      TabIndex        =   0
      Top             =   2160
      Width           =   1455
   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 D4R1
    'Driver for routine GAMMLN
    Dim ACTUAL(5), X(5)
    PI = 3.1415926
    ACTUAL(1) = 1.524064
    ACTUAL(2) = 0#
    ACTUAL(3) = -0.085374
    ACTUAL(4) = 12.80183
    ACTUAL(5) = 39.33989
    X(1) = 0.2
    X(2) = 1#
    X(3) = 1.2
    X(4) = 10
    X(5) = 20
    Print
    Print "    X       Actual      GAMMA(X)"
    For I = 1 To 5
        Print Tab(4); Format$(X(I), "#0.0#");
        Print Tab(12); Format$(ACTUAL(I), "##.000000");
        Print Tab(25); Format$(GAMMLN(X(I)), "##.000000")
    Next I
End Sub
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