d13r2.frm

VB常用数值算法集 内含有解线性代数方程组

VERSION 5.00
Begin VB.Form Form1 
   Caption         =   "Form1"
   ClientHeight    =   4305
   ClientLeft      =   60
   ClientTop       =   345
   ClientWidth     =   6300
   LinkTopic       =   "Form1"
   ScaleHeight     =   4305
   ScaleWidth      =   6300
   StartUpPosition =   3  'Windows Default
   Begin VB.CommandButton Command1 
      Caption         =   "Command1"
      Height          =   375
      Left            =   4560
      TabIndex        =   0
      Top             =   3720
      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 D13R2
    'Driver for routine MDIAN1
    NPTS = 50
    Dim DATA(50)
    IDUM& = -5
    For I = 1 To NPTS
        DATA(I) = GASDEV(IDUM&)
    Next I
    Call MDIAN1(DATA(), NPTS, XMED)
    Print
    Print Tab(5); "Gaussian distrib., zero mean, unit variance"
    Print
    Print Tab(5); "Median of data set is   "; Format$(XMED, "###.######")
    Print
    Print Tab(5); "Sorted data"
    Print
    For I = 1 To 10
        J = (I - 1) * 5
        Print Tab(5); Format$(DATA(J + 1), "#.#####0");
        Print Tab(18); Format$(DATA(J + 2), "#.#####0");
        Print Tab(31); Format$(DATA(J + 3), "#.#####0");
        Print Tab(44); Format$(DATA(J + 4), "#.#####0");
        Print Tab(57); Format$(DATA(J + 5), "#.#####0")
    Next I
End Sub
Sub MDIAN1(X(), N, XMED)
    Call SORT(N, X())
    N2 = N / 2
    If 2 * N2 = N Then
        XMED = 0.5 * (X(N2) + X(N2 + 1))
    Else
        XMED = X(N2 + 1)
    End If
End Sub
   Sub SORT(N, RA())
      L = N / 2 + 1
      IR = N
10    If L > 1 Then
          L = L - 1
          RRA = RA(L)
      Else
          RRA = RA(IR)
          RA(IR) = RA(1)
          IR = IR - 1
          If IR = 1 Then
              RA(1) = RRA
              Exit Sub
          End If
      End If
      I = L
      J = L + L
20    If J <= IR Then
          If J < IR Then
              If RA(J) < RA(J + 1) Then J = J + 1
          End If
          If RRA < RA(J) Then
              RA(I) = RA(J)
              I = J
              J = J + J
          Else
              J = IR + 1
          End If
          GoTo 20
      End If
      RA(I) = RRA
      GoTo 10
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