使用VBA帮我写一个excel的卷积函数,要求对两个任意大小的选定区域进行线性卷积,卷积结果按照纵向显示在excel表格中
时间: 2023-07-08 16:19:01 浏览: 58
好的,以下是一个简单的VBA函数,可以计算两个选定区域的线性卷积,并将结果按照纵向显示在Excel表格中:
```
Function Convolution(rng1 As Range, rng2 As Range) As Variant
'获取输入区域的大小
Dim rows1 As Integer, cols1 As Integer
Dim rows2 As Integer, cols2 As Integer
rows1 = rng1.Rows.Count
cols1 = rng1.Columns.Count
rows2 = rng2.Rows.Count
cols2 = rng2.Columns.Count
'创建输出数组
Dim output() As Double
ReDim output(1 To rows1 + rows2 - 1, 1 To 1)
'计算卷积
Dim i As Integer, j As Integer, k As Integer
For i = 1 To rows1 + rows2 - 1
output(i, 1) = 0
For j = 1 To cols1
For k = 1 To cols2
If i - k + 1 > 0 And i - k + 1 <= rows1 Then
output(i, 1) = output(i, 1) + rng1(i - k + 1, j).Value * rng2(rows2 - k + 2 - (i - 1), j).Value
End If
Next k
Next j
Next i
'将结果输出到表格中
Convolution = output
End Function
```
使用方法:在Excel中打开Visual Basic编辑器,将以上代码复制粘贴到一个新的模块中。然后在Excel表格中选定两个区域(大小可以不同),在一个空白单元格中输入以下公式:
```
=Convolution(A1:B5, C1:D3)
```
其中,A1:B5和C1:D3为选定的两个区域。按下回车键后,将会在当前单元格下方生成一个与卷积结果大小相同的区域,并显示卷积结果。