VERSION 5.00
Begin VB.Form Form3 
   Caption         =   "高斯分布"
   ClientHeight    =   5550
   ClientLeft      =   60
   ClientTop       =   450
   ClientWidth     =   8010
   LinkTopic       =   "Form3"
   ScaleHeight     =   5550
   ScaleWidth      =   8010
   StartUpPosition =   3  '窗口缺省
   Begin VB.TextBox Text2 
      Height          =   495
      Left            =   2640
      TabIndex        =   8
      Text            =   "0"
      Top             =   4920
      Width           =   1215
   End
   Begin VB.TextBox Text1 
      Height          =   495
      Left            =   2640
      TabIndex        =   7
      Text            =   "0"
      Top             =   4200
      Width           =   1215
   End
   Begin VB.PictureBox Picture1 
      AutoRedraw      =   -1  'True
      Height          =   3975
      Left            =   600
      ScaleHeight     =   3915
      ScaleWidth      =   7155
      TabIndex        =   2
      Top             =   120
      Width           =   7215
   End
   Begin VB.CommandButton Command1 
      Caption         =   "確定"
      Height          =   495
      Left            =   5400
      TabIndex        =   1
      Top             =   4320
      Width           =   1095
   End
   Begin VB.CommandButton Command2 
      Caption         =   "返回"
      Height          =   495
      Left            =   5400
      TabIndex        =   0
      Top             =   4920
      Width           =   1095
   End
   Begin VB.Label Label4 
      Caption         =   "variance"
      BeginProperty Font 
         Name            =   "宋體"
         Size            =   15
         Charset         =   134
         Weight          =   400
         Underline       =   0   'False
         Italic          =   0   'False
         Strikethrough   =   0   'False
      EndProperty
      Height          =   495
      Left            =   1080
      TabIndex        =   6
      Top             =   4800
      Width           =   1215
   End
   Begin VB.Label Label3 
      Caption         =   "mean "
      BeginProperty Font 
         Name            =   "宋體"
         Size            =   15.75
         Charset         =   134
         Weight          =   400
         Underline       =   0   'False
         Italic          =   0   'False
         Strikethrough   =   0   'False
      EndProperty
      Height          =   375
      Left            =   1440
      TabIndex        =   5
      Top             =   4200
      Width           =   975
   End
   Begin VB.Label Label2 
      AutoSize        =   -1  'True
      Caption         =   "-200"
      Height          =   180
      Left            =   120
      TabIndex        =   4
      Top             =   3840
      Width           =   360
   End
   Begin VB.Label Label1 
      AutoSize        =   -1  'True
      Caption         =   "200"
      Height          =   180
      Left            =   240
      TabIndex        =   3
      Top             =   120
      Width           =   270
   End
End
Attribute VB_Name = "Form3"
Attribute VB_GlobalNameSpace = False
Attribute VB_Creatable = False
Attribute VB_PredeclaredId = True
Attribute VB_Exposed = False
Dim i, j, mean, var, y(1 To 250), a As Double
  Const PI = 3.1415926
Private Sub Command1_Click()
  Picture1.Cls
  Picture1.Scale (0, 250)-(250, -250)
  Picture1.Line (0, 0)-(250, 0)
  Picture1.Line (0, -200)-(250, -200)
  Picture1.Line (0, 200)-(250, 200)
  mean = Text1.Text
  var = Text2.Text
  Randomize
     y(1) = Sqr(var) * Sqr(-2 * Log(Rnd(250)) / Log(10)) * Sin(2 * PI * Rnd(250)) + mean
     Picture1.Circle (1, y(1)), 1, RGB(10, 10, 255)
    For i = 2 To 250
          y(i) = Sqr(var) * Sqr(-2 * Log(Rnd(250)) / Log(10)) * Sin(2 * PI * Rnd(250)) + mean
          Picture1.Line (i - 1, y(i - 1))-(i, y(i)), RGB(0, 0, 255)
          Picture1.Circle (i, y(i)), 1, RGB(10, 10, 255)
          n = 0
          k = 0
          For j = 1 To i
              n = n + y(j)
              k = k + (y(j) * y(j) - mean * mean)
          Next j
          a = Abs(k / j)
          a = Sqr(a)
          If k < 0 Then a = -a
         Picture1.PSet (i, n / i), RGB(255, 0, 0)
         Picture1.PSet (i, a), RGB(0, 255, 0)
    Next i
End Sub

Private Sub Command2_Click()
Form3.Visible = False
Form1.Visible = True
End Sub