See if this code helps you out. It works with a given array, but you can
make an array from a worksheet range and working with arrays is faster
in any case.
You may need some alterations to suit your particular needs.
RBS
Function SwingArray(ByRef arr1 As Variant, _
ByRef colToTest As Long, _
ByRef DoSort As Boolean, _
ByRef StartCol As Long, _
Optional ByRef lDiscardLastCols As Long = 0) _
As Variant
'takes one multi-column 2D array and swings the elements
'that have the same value in colToTest to the row where
'this value was found first. Column colToTest will only
'hold unique values in the resulting array.
'StartCol is the column where the copying of the elements
'starts from.
'--------------------------------------------------------
Dim arr2()
Dim i As Long
Dim n As Long
Dim c As Long
Dim c2 As Long
Dim c3 As Long
Dim maxItems As Long
Dim uCo As Long
Dim LBR1 As Long
Dim UBR1 As Long
Dim LBC1 As Long
Dim UBC1 As Long
Dim tempIdx As Long
Dim arrError(0 To 0)
On Error GoTo ERROROUT
LBR1 = LBound(arr1, 1)
UBR1 = UBound(arr1, 1)
LBC1 = LBound(arr1, 2)
UBC1 = UBound(arr1, 2) - lDiscardLastCols
'adjust UBR1 to account for empty elements
'these empty element have to be at the
'bottom of the array if they are there
'-----------------------------------------
For i = LBR1 To UBR1
If arr1(i, colToTest) = Empty Then
UBR1 = i - 1
Exit For
End If
Next
'sorting the supplied array ascending
'------------------------------------
If DoSort = True Then
If PreSort2DArray(arr1, _
"A", _
colToTest) = False Then
On Error GoTo 0
SwingArray = False
Exit Function
End If
End If
'find and mark the doubles
'get the maximum number of doubles
'---------------------------------
tempIdx = arr1(LBR1, colToTest)
For i = LBR1 + 1 To UBR1
If Not arr1(i, colToTest) = tempIdx Then
tempIdx = arr1(i, colToTest)
uCo = uCo + 1
c2 = 0
Else
arr1(i, LBC1) = 0
c2 = c2 + 1
If c2 > maxItems Then
maxItems = c2
End If
End If
Next
'adjust the final array
'LBound will be as the original array
'------------------------------------
ReDim arr2(LBR1 To uCo + LBR1, _
LBC1 To (UBC1) + maxItems * _
(((UBC1 + 1) - StartCol)))
n = LBR1 - 1
'swing the elements from vertical to horizontal
'----------------------------------------------
For i = LBR1 To UBR1
If Not arr1(i, LBC1) = 0 Then
'copy first row in full
n = n + 1
For c = LBC1 To UBC1
arr2(n, c) = arr1(i, c)
Next
c3 = UBC1 + 1
Else
'copy subsequent rows from specified start column
'------------------------------------------------
For c = StartCol To UBC1
arr2(n, c3) = arr1(i, c)
c3 = c3 + 1
Next
End If
Next
SwingArray = arr2
On Error GoTo 0
Exit Function
ERROROUT:
arrError(0) = "ERROR"
SwingArray = arrError
On Error GoTo 0
End Function
Function PreSort2DArray(ByRef avArray, _
ByRef sOrder As String, _
ByRef iKey As Long, _
Optional ByRef iLow1 As Long = -1, _
Optional ByRef iHigh1 As Long = -1) _
As Boolean
'the routine procSort2D can't handle large arrays
'causing an error out of stack space
'this is handled by sorting increasing larger parts
'of the array, so that there is less to be done when
'the whole array gets sorted
'---------------------------------------------------
Dim LR As Long
Dim lPreSorts As Long
Dim lArrayChunk As Long
Dim n As Long
LR = UBound(avArray)
'this value may depend on the hardware
'-------------------------------------
lArrayChunk = 8000
'no need to do pre-sorts
'-----------------------
If LR < lArrayChunk Then
PreSort2DArray = procSort2D(avArray, _
sOrder, _
iKey, _
iLow1, _
iHigh1)
Exit Function
End If
lPreSorts = LR \ lArrayChunk
For n = 0 To lPreSorts
If n < lPreSorts Then
'increase the part of the array in steps of lArrayChunk
'------------------------------------------------------
PreSort2DArray = procSort2D(avArray, _
sOrder, _
iKey, _
iLow1, _
(n + 1) * lArrayChunk)
Else
'sort the whole array
'--------------------
PreSort2DArray = procSort2D(avArray, _
sOrder, _
iKey, _
iLow1, _
iHigh1)
End If
Next
End Function
Function procSort2D(ByRef avArray, _
ByRef sOrder As String, _
ByRef iKey As Long, _
Optional ByRef iLow1 As Long = -1, _
Optional ByRef iHigh1 As Long = -1) _
As Boolean
Dim iLow2 As Long
Dim iHigh2 As Long
Dim i As Long
Dim vItem1 As Variant
Dim vItem2 As Variant
On Error GoTo ERROROUT
If iLow1 = -1 Then
iLow1 = LBound(avArray, 1)
End If
If iHigh1 = -1 Then
iHigh1 = UBound(avArray, 1)
End If
'Set new extremes to old extremes
iLow2 = iLow1
iHigh2 = iHigh1
'Get value of array item in middle of new extremes
vItem1 = avArray((iLow1 + iHigh1) \ 2, iKey)
'Loop for all the items in the array between the extremes
While iLow2 < iHigh2
If sOrder = "A" Then
'Find the first item that is greater than the mid-point item
While avArray(iLow2, iKey) < vItem1 And iLow2 < iHigh1
iLow2 = iLow2 + 1
Wend
'Find the last item that is less than the mid-point item
While avArray(iHigh2, iKey) > vItem1 And iHigh2 > iLow1
iHigh2 = iHigh2 - 1
Wend
Else
'Find the first item that is less than the mid-point item
While avArray(iLow2, iKey) > vItem1 And iLow2 < iHigh1
iLow2 = iLow2 + 1
Wend
'Find the last item that is greater than the mid-point item
While avArray(iHigh2, iKey) < vItem1 And iHigh2 > iLow1
iHigh2 = iHigh2 - 1
Wend
End If
'If the two items are in the wrong order, swap the rows
If iLow2 < iHigh2 Then
For i = LBound(avArray) To UBound(avArray, 2)
vItem2 = avArray(iLow2, i)
avArray(iLow2, i) = avArray(iHigh2, i)
avArray(iHigh2, i) = vItem2
Next
End If
'If the pointers are not together, advance to the next item
If iLow2 <= iHigh2 Then
iLow2 = iLow2 + 1
iHigh2 = iHigh2 - 1
End If
Wend
'Recurse to sort the lower half of the extremes
If iHigh2 > iLow1 Then
procSort2D avArray, _
sOrder, _
iKey, _
iLow1, _
iHigh2
End If
'Recurse to sort the upper half of the extremes
If iLow2 < iHigh1 Then
procSort2D avArray, _
sOrder, _
iKey, _
iLow2, _
iHigh1
End If
procSort2D = True
Exit Function
ERROROUT:
procSort2D = False
End Function
