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Maybe, Myrna will post the entire functioning code module Since you asked, here it is. It is generic, i.e. it isn't written specifically for a given population and set size, as yours it. It will do permutations or combinations. It uses a recursive routine to generate the subsets, one routine for combinations, a different one for permutations. To use it, you put the letter C or P (for combinations or permutations) in a cell. The cell below that contains the number of items in a subset. The cells below are a list of the items that make up the population. They could be numbers, letters and symbols, or words, etc. You select the top cell, or the entire range and run the sub. The subsets are written to a new sheet in the workbook. Option Explicit Dim vAllItems As Variant Dim Buffer() As String Dim BufferPtr As Long Dim Results As Worksheet Sub ListPermutations() Dim Rng As Range Dim PopSize As Integer Dim SetSize As Integer Dim Which As String Dim N As Double Const BufferSize As Long = 4096 Set Rng = Selection.Columns(1).Cells If Rng.Cells.Count = 1 Then Set Rng = Range(Rng, Rng.End(xlDown)) End If PopSize = Rng.Cells.Count - 2 If PopSize < 2 Then GoTo DataError SetSize = Rng.Cells(2).Value If SetSize PopSize Then GoTo DataError Which = UCase$(Rng.Cells(1).Value) Select Case Which Case "C" N = Application.WorksheetFunction.Combin(PopSize, SetSize) Case "P" N = Application.WorksheetFunction.Permut(PopSize, SetSize) Case Else GoTo DataError End Select If N Cells.Count Then GoTo DataError Application.ScreenUpdating = False Set Results = Worksheets.Add vAllItems = Rng.Offset(2, 0).Resize(PopSize).Value ReDim Buffer(1 To BufferSize) As String BufferPtr = 0 If Which = "C" Then AddCombination PopSize, SetSize Else AddPermutation PopSize, SetSize End If vAllItems = 0 Application.ScreenUpdating = True Exit Sub DataError: If N = 0 Then Which = "Enter your data in a vertical range of at least 4 cells. " _ & String$(2, 10) _ & "Top cell must contain the letter C or P, 2nd cell is the number " _ & "of items in a subset, the cells below are the values from which " _ & "the subset is to be chosen." Else Which = "This requires " & Format$(N, "#,##0") & _ " cells, more than are available on the worksheet!" End If MsgBox Which, vbOKOnly, "DATA ERROR" Exit Sub End Sub Private Sub AddPermutation(Optional PopSize As Integer = 0, _ Optional SetSize As Integer = 0, _ Optional NextMember As Integer = 0) Static iPopSize As Integer Static iSetSize As Integer Static SetMembers() As Integer Static Used() As Integer Dim i As Integer If PopSize < 0 Then iPopSize = PopSize iSetSize = SetSize ReDim SetMembers(1 To iSetSize) As Integer ReDim Used(1 To iPopSize) As Integer NextMember = 1 End If For i = 1 To iPopSize If Used(i) = 0 Then SetMembers(NextMember) = i If NextMember < iSetSize Then Used(i) = True AddPermutation , , NextMember + 1 Used(i) = False Else SavePermutation SetMembers() End If End If Next i If NextMember = 1 Then SavePermutation SetMembers(), True Erase SetMembers Erase Used End If End Sub 'AddPermutation Private Sub AddCombination(Optional PopSize As Integer = 0, _ Optional SetSize As Integer = 0, _ Optional NextMember As Integer = 0, _ Optional NextItem As Integer = 0) Static iPopSize As Integer Static iSetSize As Integer Static SetMembers() As Integer Dim i As Integer If PopSize < 0 Then iPopSize = PopSize iSetSize = SetSize ReDim SetMembers(1 To iSetSize) As Integer NextMember = 1 NextItem = 1 End If For i = NextItem To iPopSize SetMembers(NextMember) = i If NextMember < iSetSize Then AddCombination , , NextMember + 1, i + 1 Else SavePermutation SetMembers() End If Next i If NextMember = 1 Then SavePermutation SetMembers(), True Erase SetMembers End If End Sub 'AddCombination Private Sub SavePermutation(ItemsChosen() As Integer, _ Optional FlushBuffer As Boolean = False) Dim i As Integer, sValue As String Static RowNum As Long, ColNum As Long If RowNum = 0 Then RowNum = 1 If ColNum = 0 Then ColNum = 1 If FlushBuffer = True Or BufferPtr = UBound(Buffer()) Then If BufferPtr 0 Then If (RowNum + BufferPtr - 1) Rows.Count Then RowNum = 1 ColNum = ColNum + 1 If ColNum 256 Then Exit Sub End If Results.Cells(RowNum, ColNum).Resize(BufferPtr, 1).Value _ = Application.WorksheetFunction.Transpose(Buffer()) RowNum = RowNum + BufferPtr End If BufferPtr = 0 If FlushBuffer = True Then Erase Buffer RowNum = 0 ColNum = 0 Exit Sub Else ReDim Buffer(1 To UBound(Buffer)) End If End If 'construct the next set For i = 1 To UBound(ItemsChosen) sValue = sValue & ", " & vAllItems(ItemsChosen(i), 1) Next i 'and save it in the buffer BufferPtr = BufferPtr + 1 Buffer(BufferPtr) = Mid$(sValue, 3) End Sub 'SavePermutation Beware that in the new versions of excell you have to use Cells.CountLarge instead of Cells.Count or you will get Runtime error 6: overflow |
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Beware that in the new versions of excell you have to use Cells.CountLarge instead of Cells.Count or you will get Runtime error 6: overflow Note also that in Excel 2010 you will get an overflow error even using Cells.CountLarge if only the first cell of the data column is selected and the data column is empty. This can be trapped by changing lines 17-19 of the ListPermutations subroutine to: If Rng.Cells.Count = 1 Then Set Rng = Range(Rng, Rng.End(xlDown)) If WorksheetFunction.CountA(Rng) = 0 Then GoTo DataError End If End If |
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