如何在 Excel VBA 中对数组进行切片？

Question

我可以在 Excel VBA 中使用什么函数来对数组进行切片？

Answer 1

Application.WorksheetFunction.Index(数组、行、列)

如果您为行或列指定零值，那么您将获得指定的整个列或行。

例子：

Application.WorksheetFunction.Index(array, 0, 3)

这将为您提供整个第 3 列。

如果您将行和列都指定为非零，那么您将仅获得特定元素。 没有比整行或整列更小的切片的简单方法。

限制：如果您使用的是较新版本的 Excel，WorksheetFunction.Index 可以处理的数组大小存在限制。如果array 的行数超过 65,536 行或列数超过 65,536，则会引发“类型不匹配”错误。如果这对您来说是个问题，请参阅不受相同限制的this more complicated answer。

这是我编写的用于执行所有 1D 和 2D 切片的函数：

Public Function GetArraySlice2D(Sarray As Variant, Stype As String, Sindex As Integer, Sstart As Integer, Sfinish As Integer) As Variant

' this function returns a slice of an array, Stype is either row or column
' Sstart is beginning of slice, Sfinish is end of slice (Sfinish = 0 means entire
' row or column is taken), Sindex is the row or column to be sliced
' (NOTE: 1 is always the first row or first column)
' an Sindex value of 0 means that the array is one dimensional 3/20/09 ljr

Dim vtemp() As Variant
Dim i As Integer

On Err GoTo ErrHandler

Select Case Sindex
    Case 0
        If Sfinish - Sstart = UBound(Sarray) - LBound(Sarray) Then
            vtemp = Sarray
        Else
            ReDim vtemp(1 To Sfinish - Sstart + 1)
            For i = 1 To Sfinish - Sstart + 1
                vtemp(i) = Sarray(i + Sstart - 1)
            Next i
        End If
    Case Else
        Select Case Stype
            Case "row"
                If Sfinish = 0 Or (Sstart = LBound(Sarray, 2) And Sfinish = UBound(Sarray, 2)) Then
                    vtemp = Application.WorksheetFunction.Index(Sarray, Sindex, 0)
                Else
                    ReDim vtemp(1 To Sfinish - Sstart + 1)
                    For i = 1 To Sfinish - Sstart + 1
                        vtemp(i) = Sarray(Sindex, i + Sstart - 1)
                    Next i
                End If
            Case "column"
                If Sfinish = 0 Or (Sstart = LBound(Sarray, 1) And Sfinish = UBound(Sarray, 1)) Then
                    vtemp = Application.WorksheetFunction.Index(Sarray, 0, Sindex)
                Else
                    ReDim vtemp(1 To Sfinish - Sstart + 1)
                    For i = 1 To Sfinish - Sstart + 1
                        vtemp(i) = Sarray(i + Sstart - 1, Sindex)
                    Next i
                End If
        End Select
End Select
GetArraySlice2D = vtemp
Exit Function

ErrHandler:
    Dim M As Integer
    M = MsgBox("Bad Array Input", vbOKOnly, "GetArraySlice2D")

End Function

Answer 2

您可以结合使用 Rows、Columns、Offset 和 Resize 属性来获取范围的子集。

例如，如果您的范围是 5 列乘 3 行：

Set rng = Range("A1:E3")

您可以通过适当组合上述属性来获得任何子集。例如，如果您想获取第二行最右边的 3 个单元格（即上例中的“C2:E2”），您可以执行以下操作：

   Set rngSubset = rng.Rows(2).Offset(0, rng.Columns.Count - 3).Resize(1, 3)

然后您可以将其封装在 VBA 函数中。

Answer 3

有两件事，VBA 不支持数组切片，所以无论您使用什么，都必须自己动手。但由于这仅适用于 Excel，因此您可以使用内置的工作表函数索引进行数组切片。

Sub Test()
    'All example return a 1 based 2D array.
    Dim myArr As Variant 'This var must be generic to work.
    'Get whole range:
    myArr = ActiveSheet.UsedRange
    'Get just column 1:
    myArr = WorksheetFunction.Index(ActiveSheet.UsedRange, 0, 1)
    'Get just row 5
    myArr = WorksheetFunction.Index(ActiveSheet.UsedRange, 5, 0)
End Sub

Answer 4

Lance 的解决方案有一个错误，它不尊重具有未指定长度的子数组的偏移起始值，我还发现它的工作原理相当混乱。我在下面提供了一个（希望）更透明的解决方案。

Public Function GetSubTable(vIn As Variant, Optional ByVal iStartRow As Integer, Optional ByVal iStartCol As Integer, Optional ByVal iHeight As Integer, Optional ByVal iWidth As Integer) As Variant
    Dim vReturn As Variant
    Dim iInRowLower As Integer
    Dim iInRowUpper As Integer
    Dim iInColLower As Integer
    Dim iInColUpper As Integer
    Dim iEndRow As Integer
    Dim iEndCol As Integer
    Dim iRow As Integer
    Dim iCol As Integer

    iInRowLower = LBound(vIn, 1)
    iInRowUpper = UBound(vIn, 1)
    iInColLower = LBound(vIn, 2)
    iInColUpper = UBound(vIn, 2)

    If iStartRow = 0 Then
        iStartRow = iInRowLower
    End If
    If iStartCol = 0 Then
        iStartCol = iInColLower
    End If

    If iHeight = 0 Then
        iHeight = iInRowUpper - iStartRow + 1
    End If
    If iWidth = 0 Then
        iWidth = iInColUpper - iStartCol + 1
    End If

    iEndRow = iStartRow + iHeight - 1
    iEndCol = iStartCol + iWidth - 1

    ReDim vReturn(1 To iEndRow - iStartRow + 1, 1 To iEndCol - iStartCol + 1)

    For iRow = iStartRow To iEndRow
        For iCol = iStartCol To iEndCol
            vReturn(iRow - iStartRow + 1, iCol - iStartCol + 1) = vIn(iRow, iCol)
        Next
    Next

    GetSubTable = vReturn
End Function

Answer 5

以下是对 Excel 变体数组进行切片的快速方法。其中大部分是使用来自这个优秀网站http://bytecomb.com/vba-reference/的信息放在一起的@

本质上，目标数组被预先构建为一个空的 1d 或 2d 变体，并与源数组和要切片的元素索引一起传递给 sub。由于数组存储在内存中的方式，对列进行切片比对行进行切片要快得多，因为内存布局允许复制单个块。

这样做的好处是它的扩展性远远超出了 Excel 行数限制。

Option Explicit

#If Win64 Then
    Public Const PTR_LENGTH As Long = 8
    Public Declare PtrSafe Function GetTickCount Lib "kernel32" () As Long
    Public Declare PtrSafe Sub Mem_Copy Lib "kernel32" Alias "RtlMoveMemory" (ByRef Destination As Any, ByRef Source As Any, ByVal Length As Long)
    Private Declare PtrSafe Function VarPtrArray Lib "VBE7" Alias "VarPtr" (ByRef Var() As Any) As LongPtr
    Private Declare PtrSafe Sub CopyMemory Lib "kernel32" Alias "RtlMoveMemory" (Destination As Any, Source As Any, ByVal Length As Long)
    Private Declare PtrSafe Sub FillMemory Lib "kernel32" Alias "RtlFillMemory" (Destination As Any, ByVal Length As Long, ByVal Fill As Byte)
#Else
    Public Const PTR_LENGTH As Long = 4
    Public Declare Function GetTickCount Lib "kernel32" () As Long
    Public Declare Sub Mem_Copy Lib "kernel32" Alias "RtlMoveMemory" (ByRef Destination As Any, ByRef Source As Any, ByVal Length As Long)
    Private Declare Function VarPtrArray Lib "VBE7" Alias "VarPtr" (ByRef Var() As Any) As LongPtr
    Private Declare Sub CopyMemory Lib "kernel32" Alias "RtlMoveMemory" (Destination As Any, Source As Any, ByVal Length As Long)
    Private Declare Sub FillMemory Lib "kernel32" Alias "RtlFillMemory" (Destination As Any, ByVal Length As Long, ByVal Fill As Byte)
#End If

Private Type SAFEARRAYBOUND
    cElements    As Long
    lLbound      As Long
End Type

Private Type SAFEARRAY_VECTOR
    cDims        As Integer
    fFeatures    As Integer
    cbElements   As Long
    cLocks       As Long
    pvData       As LongPtr
    rgsabound(0) As SAFEARRAYBOUND
End Type

Sub SliceColumn(ByVal idx As Long, ByRef arrayToSlice() As Variant, ByRef slicedArray As Variant)
'slicedArray can be passed as a 1d or 2d array
'sliceArray can also be part bound, eg  slicedArray(1 to 100) or slicedArray(10 to 100)
Dim ptrToArrayVar As LongPtr
Dim ptrToSafeArray As LongPtr
Dim ptrToArrayData As LongPtr
Dim ptrToArrayData2 As LongPtr
Dim uSAFEARRAY As SAFEARRAY_VECTOR
Dim ptrCursor As LongPtr
Dim cbElements As Long
Dim atsBound1 As Long
Dim elSize As Long

    'determine bound1 of source array (ie row Count)
    atsBound1 = UBound(arrayToSlice, 1)
    'get pointer to source array Safearray
    ptrToArrayVar = VarPtrArray(arrayToSlice)
    CopyMemory ptrToSafeArray, ByVal ptrToArrayVar, PTR_LENGTH
    CopyMemory uSAFEARRAY, ByVal ptrToSafeArray, LenB(uSAFEARRAY)
    ptrToArrayData = uSAFEARRAY.pvData
    'determine byte size of source elements
    cbElements = uSAFEARRAY.cbElements

    'get pointer to destination array Safearray
    ptrToArrayVar = VarPtr(slicedArray) + 8 'Variant reserves first 8bytes
    CopyMemory ptrToSafeArray, ByVal ptrToArrayVar, PTR_LENGTH
    CopyMemory uSAFEARRAY, ByVal ptrToSafeArray, LenB(uSAFEARRAY)
    ptrToArrayData2 = uSAFEARRAY.pvData

    'determine elements size
    elSize = UBound(slicedArray, 1) - LBound(slicedArray, 1) + 1
    'determine start position of data in source array
    ptrCursor = ptrToArrayData + (((idx - 1) * atsBound1 + LBound(slicedArray, 1) - 1) * cbElements)
    'Copy source array to destination array
    CopyMemory ByVal ptrToArrayData2, ByVal ptrCursor, cbElements * elSize

End Sub

Sub SliceRow(ByVal idx As Long, ByRef arrayToSlice() As Variant, ByRef slicedArray As Variant)
'slicedArray can be passed as a 1d or 2d array
'sliceArray can also be part bound, eg  slicedArray(1 to 100) or slicedArray(10 to 100)
Dim ptrToArrayVar As LongPtr
Dim ptrToSafeArray As LongPtr
Dim ptrToArrayData As LongPtr
Dim ptrToArrayData2 As LongPtr
Dim uSAFEARRAY As SAFEARRAY_VECTOR
Dim ptrCursor As LongPtr
Dim cbElements As Long
Dim atsBound1 As Long
Dim i As Long

    'determine bound1 of source array (ie row Count)
    atsBound1 = UBound(arrayToSlice, 1)
    'get pointer to source array Safearray
    ptrToArrayVar = VarPtrArray(arrayToSlice)
    CopyMemory ptrToSafeArray, ByVal ptrToArrayVar, PTR_LENGTH
    CopyMemory uSAFEARRAY, ByVal ptrToSafeArray, LenB(uSAFEARRAY)
    ptrToArrayData = uSAFEARRAY.pvData
    'determine byte size of source elements
    cbElements = uSAFEARRAY.cbElements

    'get pointer to destination array Safearray
    ptrToArrayVar = VarPtr(slicedArray) + 8 'Variant reserves first 8bytes
    CopyMemory ptrToSafeArray, ByVal ptrToArrayVar, PTR_LENGTH
    CopyMemory uSAFEARRAY, ByVal ptrToSafeArray, LenB(uSAFEARRAY)
    ptrToArrayData2 = uSAFEARRAY.pvData

    ptrCursor = ptrToArrayData + ((idx - 1) * cbElements)
    For i = LBound(slicedArray, 1) To UBound(slicedArray, 1)

        CopyMemory ByVal ptrToArrayData2, ByVal ptrCursor, cbElements
        ptrCursor = ptrCursor + (cbElements * atsBound1)
        ptrToArrayData2 = ptrToArrayData2 + cbElements
    Next i

End Sub

示例用法：

Sub exampleUsage()
Dim sourceArr() As Variant
Dim destArr As Variant
Dim sliceIndex As Long

    On Error GoTo Err:

    sourceArr = Sheet1.Range("A1:D10000").Value2
    sliceIndex = 2 'Slice column 2 / slice row 2

    'Build target array
    ReDim destArr(20 To 10000) '1D array from row 20 to 10000
'    ReDim destArr(1 To 10000) '1D array from row 1 to 10000
'    ReDim destArr(20 To 10000, 1 To 1) '2D array from row 20 to 10000
'    ReDim destArr(1 To 10000, 1 To 1) '2D array from row 1 to 10000

    'Slice Column
    SliceColumn sliceIndex, sourceArr, destArr

    'Slice Row
    ReDim destArr(1 To 4)
    SliceRow sliceIndex, sourceArr, destArr

Err:
    'Tidy Up See ' http://stackoverflow.com/questions/16323776/copy-an-array-reference-in-vba/16343887#16343887
    FillMemory destArr, 16, 0

End Sub

使用以下测试在旧的双核 CPU 上计时

Sub timeMethods()
Const trials As Long = 10
Const rowsToCopy As Long = 1048576
Dim rng As Range
Dim Arr() As Variant
Dim newArr As Variant
Dim newArr2 As Variant
Dim t As Long, t1 As Long, t2 As Long, t3 As Long
Dim i As Long

    On Error GoTo Err

    'Setup Conditions 1time only
    Sheet1.Cells.Clear
    Sheet1.Range("A1:D1").Value = Split("A1,B1,C1,D1", ",") 'Strings
'    Sheet1.Range("A1:D1").Value = Split("1,1,1,1", ",") 'Longs
    Sheet1.Range("A1:D1").AutoFill Destination:=Sheet1.Range("A1:D" & rowsToCopy), Type:=xlFillDefault

    'Build source data
    Arr = Sheet1.Range("A1:D" & rowsToCopy).Value
    Set rng = Sheet1.Range("A1:D" & rowsToCopy)

    'Build target container
    ReDim newArr(1 To rowsToCopy)
    Debug.Print "Trials=" & trials & " Rows=" & rowsToCopy
    'Range
    t3 = 0
    For t = 1 To trials
        t1 = GetTickCount

            For i = LBound(newArr, 1) To UBound(newArr, 1)
                newArr(i) = rng(i, 2).Value2
            Next i

        t2 = GetTickCount
        t3 = t3 + (t2 - t1)
        Debug.Print "Range: " & t2 - t1
    Next t
    Debug.Print "Range Avg ms: " & t3 / trials

    'Array
    t3 = 0
    For t = 1 To trials
        t1 = GetTickCount

            For i = LBound(newArr, 1) To UBound(newArr, 1)
                newArr(i) = Arr(i, 2)
            Next i

        t2 = GetTickCount
        t3 = t3 + (t2 - t1)
        Debug.Print "Array: " & t2 - t1
    Next t
    Debug.Print "Array Avg ms: " & t3 / trials

    'Index
    t3 = 0
    For t = 1 To trials
        t1 = GetTickCount

            newArr2 = WorksheetFunction.Index(rng, 0, 2) 'newArr2 2d

        t2 = GetTickCount
        t3 = t3 + (t2 - t1)
        Debug.Print "Index: " & t2 - t1
    Next t
    Debug.Print "Index Avg ms: " & t3 / trials

    'CopyMemBlock
    t3 = 0
    For t = 1 To trials
        t1 = GetTickCount

            SliceColumn 2, Arr, newArr

        t2 = GetTickCount
        t3 = t3 + (t2 - t1)
        Debug.Print "CopyMem: " & t2 - t1
    Next t
    Debug.Print "CopyMem Avg ms: " & t3 / trials

Err:
    'Tidy Up
    FillMemory newArr, 16, 0


End Sub

Answer 6

这是另一种方式。

这不是多维的，但可以单行单列工作。

f 和 t 参数是从零开始的。

Function slice(ByVal arr, ByVal f, ByVal t)
    slice = Application.Index(arr, Evaluate("Transpose(Row(" & f + 1 & ":" & t + 1 & "))"))
End Function

Answer 7

这是我编写的一个用于子集二维数组的漂亮函数

Function Subset2D(arr As Variant, Optional rowStart As Long = 1, Optional rowStop As Long = -1, Optional colIndices As Variant) As Variant
    'Subset a 2d array (arr)
    'If rowStop = -1, all rows are returned
    'colIndices can be provided as a variant array like Array(1,3)
    'if colIndices is not provided, all columns are returned

    Dim newarr() As Variant, newRows As Long, newCols As Long, i As Long, k As Long, refCol As Long

    'Set the correct rowStop
    If rowStop = -1 Then rowStop = UBound(arr, 1)

    'Set the colIndices if they were not provided
    If IsMissing(colIndices) Then
        ReDim colIndices(1 To UBound(arr, 2))
        For k = 1 To UBound(arr, 2)
            colIndices(k) = k
        Next k
    End If

    'Get the dimensions of newarr
    newRows = rowStop - rowStart + 1
    newCols = UBound(colIndices) + 1
    ReDim newarr(1 To newRows, 1 To newCols)

    'Loop through each empty element of newarr and set its value
    For k = 1 To UBound(newarr, 2) 'Loop through each column
        refCol = colIndices(k - 1) 'Get the corresponding reference column
        For i = 1 To UBound(newarr, 1) 'Loop through each row
            newarr(i, k) = arr(i + rowStart - 1, refCol) 'Set the value
        Next i
    Next k

    Subset2D = newarr
End Function

Answer 8

与许多其他最近的语言不同，数组没有直接的slice 函数。

但是，有一个短代码 sn-p 非常方便。 下面是一维数组的完整解决方案：

'*************************************************************
'*                      Fill(N1,N2)
'* Create 1 dimension array with values from N1 to N2 step 1
'*************************************************************
Function Fill(N1 As Long, N2 As Long) As Variant
 Dim Arr As Variant
 If N2 < N1 Then
   Fill = False
   Exit Function
 End If
 Fill = WorksheetFunction.Transpose(Evaluate("Row(" & N1 & ":" & N2 & ")"))
End Function

'**********************************************************************
'*                        Slice(AArray, [N1,N2])
'* Slice an array between indices N1 to N2
'***********************************************************************
Function Slice(VArray As Variant, Optional N1 As Long = 1, Optional N2 As Long = 0) As Variant
 Dim Indices As Variant
 If N2 = 0 Then N2 = UBound(VArray)
 If N1 = LBound(VArray) And N2 = UBound(VArray) Then
   Slice = VArray
 Else
   Indices = Fill(N1, N2)
   Slice = WorksheetFunction.Index(VArray, 1, Indices)
 End If
End Function

用于测试

Var V As Variant
V = Fill(100,109)
PrintArr(Slice(V,3,5))

'************************************************
'*                 PrintArr(VArr)
'* Print the array VARR
'**************************************************
Function PrintArr(VArray As Variant)
 Dim S As String
 S = Join(VArray, ", ")
 MsgBox (S)
End Function

结果

102, 103, 104 

Answer 9

这是一个老问题，但如果您想将范围的 1 行检索到一维数组中，您可以使用 Index 和 Transpose 来实现。

Sub test()
    Dim ar1
    Dim a As Object: Set a = Application

    ar1 = a.Transpose(a.Transpose(a.Index(Range("A1:C3"), 2, 0)))  'get 2d row
    Debug.Print Join(ar1, "|")
End Sub

将其与 OFFSET 结合使用，您可以逐行快速读取整个范围。