VERSION 5.00
Begin VB.Form Form1 
   Caption         =   "Form1"
   ClientHeight    =   3645
   ClientLeft      =   60
   ClientTop       =   345
   ClientWidth     =   4245
   LinkTopic       =   "Form1"
   ScaleHeight     =   3645
   ScaleWidth      =   4245
   StartUpPosition =   3  'Windows Default
   Begin VB.CommandButton Command1 
      Caption         =   "Command1"
      Height          =   375
      Left            =   2520
      TabIndex        =   0
      Top             =   3120
      Width           =   1215
   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 D13R5
     'Driver for routine AVEVAR
     NPTS = 1000
     EPS = 0.1
     Dim DATA(1000)
     'Generate Gaussian distributed data
     IDUM& = -5
     Print
     Print Tab(5); "Shift   Average   Variance"
           For I = 1 To 11
         SHIFT = (I - 1) * EPS
         For J = 1 To NPTS
             DATA(J) = SHIFT + I * GASDEV(IDUM&)
         Next J
         Call AVEVAR(DATA(), NPTS, AVE, VAR)
         Print Tab(5); Format$(SHIFT, "#.#0");
         Print Tab(15); Format$(AVE, "#.#0");
         Print Tab(24); Format$(VAR, "#.#0")
    Next I
End Sub
Sub AVEVAR(DATA(), N, AVE, VAR)
    AVE = 0#
    VAR = 0#
    For J = 1 To N
        AVE = AVE + DATA(J)
    Next J
    AVE = AVE / N
    For J = 1 To N
        S = DATA(J) - AVE
        VAR = VAR + S * S
    Next J
    VAR = VAR / (N - 1)
End Sub
Function GASDEV(IDUM&)
    Static ISET, GSET
    If ISET = 0 Then
      Do
        V1 = 2# * RAN1(IDUM&) - 1#
        V2 = 2# * RAN1(IDUM&) - 1#
        R = V1 ^ 2 + V2 ^ 2
      Loop While R >= 1# Or R = 0
      FAC = Sqr(-2# * Log(R) / R)
      GSET = V1 * FAC
      GASDEV = V2 * FAC
      ISET = 1
    Else
      GASDEV = GSET
      ISET = 0
    End If
End Function
Static Function RAN1(IDUM&)
    Dim R(97)
    M1& = 259200: IA1& = 7141: IC1& = 54773: RM1 = 0.0000038580247
    M2& = 134456: IA2& = 8121: IC2& = 28411: RM2 = 0.0000074373773
    M3& = 243000: IA3& = 4561: IC3& = 51349
    If IDUM& < 0 Or IFF = 0 Then
        IFF = 1
        IX1& = (IC1& - IDUM&) Mod M1&
        IX1& = (IA1& * IX1& + IC1&) Mod M1&
        IX2& = IX1& Mod M2&
        IX1& = (IA1& * IX1& + IC1&) Mod M1&
        IX3& = IX1& Mod M3&
        For J = 1 To 97
            IX1& = (IA1& * IX1& + IC1&) Mod M1&
            IX2& = (IA2& * IX2& + IC2&) Mod M2&
            R(J) = (CSng(IX1&) + CSng(IX2&) * RM2) * RM1
        Next J
        IDUM& = 1
    End If
    IX1& = (IA1& * IX1& + IC1&) Mod M1&
    IX2& = (IA2& * IX2& + IC2&) Mod M2&
    IX3& = (IA3& * IX3& + IC3&) Mod M3&
    J = 1 + Int((97 * IX3&) / M3&)
    If J > 97 Or J < 1 Then Print "Abnormal exit": Exit Function
    RAN1 = R(J)
    R(J) = (CSng(IX1&) + CSng(IX2&) * RM2) * RM1
End Function