d4r12.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    =   5325
   ClientLeft      =   2460
   ClientTop       =   750
   ClientWidth     =   4290
   LinkTopic       =   "Form1"
   ScaleHeight     =   5325
   ScaleWidth      =   4290
   Begin VB.CommandButton Command1 
      Caption         =   "Command1"
      Height          =   375
      Left            =   2520
      TabIndex        =   0
      Top             =   4560
      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 D4R12
    'Driver for routine ERFCC
    Open "D:\VB常用数值算法集\DATA\FNCVAL.DAT" For Input As #1
    Do
      Line Input #1, Text$
    Loop While Text$ <> "Error Function"
    Line Input #1, NVAL$
    NVAL = Val(NVAL$)
    Print "Complementary error function"
    Print
    Print "    X       Actual       ERFCC(X)"
    For I = 1 To NVAL
        Line Input #1, DUM$
        X = Val(Mid(DUM$, 1, 6))
        Value = 1 - Val(Mid(DUM$, 7))
        Print Tab(4); Format$(X, "#0.0#");
        Print Tab(12); Format$(Value, "0.0000000");
        Print Tab(25); Format$(ERFCC(X), "0.0000000")
    Next I
    Close #1
End Sub
Function ERFCC(X)
    Z = Abs(X)
    T = 1# / (1# + 0.5 * Z)
    DDD = -0.82215223 + T * 0.17087277
    AAA = T * (-1.13520398 + T * (1.48851587 + T * DDD))
    BBB = T * (-0.18628806 + T * (0.27886807 + AAA))
    CCC = T * (0.37409196 + T * (0.09678418 + BBB))
    ERFCC = T * Exp(-Z * Z - 1.26551223 + T * (1.00002368 + CCC))
    If X < 0# Then ERFCC = 2# - ERFCC
End Function