在excel中用VB对两列数据进行四参数曲线拟合，并输出方程

可以使用 VBA 代码来实现在 Excel 中对两列数据进行四参数曲线拟合，并输出方程。

1.首先，在 Excel 中选择要进行拟合的数据列。
2.然后，在 Excel 中打开 "开发人员" 工具栏，并单击 "Visual Basic" 按钮。
3.在 Visual Basic 编辑器中，点击 "插入" 按钮，并选择 "模块"。
4.在新插入的模块中，输入以下代码：

Sub Four_Parameter_Curve_Fit()

Dim x() As Double
Dim y() As Double
Dim n As Integer
Dim a As Double
Dim b As Double
Dim c As Double
Dim d As Double
Dim result As String

'读取数据
n = Selection.Rows.Count
ReDim x(1 To n)
ReDim y(1 To n)
For i = 1 To n
x(i) = Cells(i, 1).Value
y(i) = Cells(i, 2).Value
Next

'执行四参数曲线拟合
FourParamCurveFit x, y, n, a, b, c, d

'生成输出结果
result = "y = " & a & " + " & b & " * x + " & c & " * x^2 + " & d & " * x^3"

'在单元格中输出结果
Range("A1").Value = result

End Sub

5.接下来，需要编写四参数曲线拟合函数。在 Visual Basic 编辑器中，点击 "插入" 按钮，并选择 "模块"。

6.在新插入的模块中，输入以下代码：

Function FourParamCurveFit(x() As Double, y() As Double, n As Integer, a As Double, b As Double, c As Double, d As Double)

Dim i As Integer
Dim X As Double
Dim Y As Double
Dim X2 As Double
Dim X3 As Double
Dim X4 As Double
Dim Y2 As Double
Dim XY As Double
Dim X2Y As Double
Dim X