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Need help with Combinations, told to come here
Math Question for football pool -------------------------------------------------------------------------------- Does anyone know where I can obtain software that would enable me to print out all 4,960 3 team football combinations using the 32 NFL teams (Order does not matter), it would be used for a pool I'm running. Thanks -------------------------------------------------------------------------------- I want to make sure I understand Team A, Team B, Team C Team A, Team B, Team D Team A, Team B, Team E |
#2
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Below is code that Myrna Larson wrote. Copy it into a module, then put a C into cell A1, 3 into cell A2, and Team A, Team B, Team C, etc. into cells A3:A34. Then run the macro "ListPermutations" (which also does combinations) and it will create your list on a new worksheet. HTH, Bernie MS Excel MVP ' 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 = Range(Range("A1"), Range("A1").End(xlDown)) PopSize = Rng.Cells.Count - 2 If PopSize < 2 Then GoTo DataError SetSize = Rng.Cells(2).Value If SetSize PopSize Then GoTo DataError Which = UCase$(Rng.Cells(1).Value) Select Case Which Case "C" N = Application.WorksheetFunction.Combin(PopSize, SetSize) Case "P" N = Application.WorksheetFunction.Permut(PopSize, SetSize) Case Else GoTo DataError End Select If N Cells.Count Then GoTo DataError Application.ScreenUpdating = False Set Results = Worksheets.Add vAllItems = Rng.Offset(2, 0).Resize(PopSize).Value ReDim Buffer(1 To BufferSize) As String BufferPtr = 0 If Which = "C" Then AddCombination PopSize, SetSize Else AddPermutation PopSize, SetSize End If vAllItems = 0 With ActiveSheet.Range(Cells(1, 2), _ Cells(Range("A65536").End(xlUp).Row, 2)) .Formula = "=If(Countif($A$1:A1,A1)=1,""YES"","""")" .Value = .Value If Application.WorksheetFunction.CountBlank(.Cells) Then If MsgBox("Remove duplicates?", vbYesNo, _ "Permutations and Combinations") = vbYes Then .SpecialCells(xlBlanks).EntireRow.Delete End If End If .EntireColumn.Delete End With Application.ScreenUpdating = True Exit Sub DataError: If N = 0 Then Which = "Enter your data in a vertical range of at least 4 cells. " _ & String$(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 "Bluesters" wrote in message ... Math Question for football pool -------------------------------------------------------------------------------- Does anyone know where I can obtain software that would enable me to print out all 4,960 3 team football combinations using the 32 NFL teams (Order does not matter), it would be used for a pool I'm running. Thanks -------------------------------------------------------------------------------- I want to make sure I understand Team A, Team B, Team C Team A, Team B, Team D Team A, Team B, Team E |
#3
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Here's an easier version: with your team names in cells A1:A32, run this:
Sub EasierVersion() Dim i As Integer Dim j As Integer Dim k As Integer For i = 1 To 30 For j = i + 1 To 31 For k = j + 1 To 32 Range("B65536").End(xlUp)(2).Value = _ Cells(i, 1).Value & ", " & _ Cells(j, 1).Value & ", " & Cells(k, 1).Value Next k Next j Next i End Sub HTH, Bernie MS Excel MVP "Bluesters" wrote in message ... Math Question for football pool -------------------------------------------------------------------------------- Does anyone know where I can obtain software that would enable me to print out all 4,960 3 team football combinations using the 32 NFL teams (Order does not matter), it would be used for a pool I'm running. Thanks -------------------------------------------------------------------------------- I want to make sure I understand Team A, Team B, Team C Team A, Team B, Team D Team A, Team B, Team E |
#4
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You can do this without a macro.
In cells A1 to A3 enter the numbers 1 to 3. In cell A2: =IF(AND(B1=31,C1=32),A1+1,A1) In cell B2: =IF(AND($C1<32,$B1<=31),$B1,0)+IF(AND(C1=32,B1<31) ,B1+1,0)+IF(AND(B1=31,C1=32),A2+1,0) In cell C2: =IF(C1<32,C1+1,B2+1) Copy cells A2:C2 to A2:C4960. "Bluesters" wrote: Math Question for football pool -------------------------------------------------------------------------------- Does anyone know where I can obtain software that would enable me to print out all 4,960 3 team football combinations using the 32 NFL teams (Order does not matter), it would be used for a pool I'm running. Thanks -------------------------------------------------------------------------------- I want to make sure I understand Team A, Team B, Team C Team A, Team B, Team D Team A, Team B, Team E |
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