Generating unique combination

BigBeachBananas

Active Member
Joined
Jul 13, 2021
Messages
450
Office Version
  1. 365
Platform
  1. Windows
  2. MacOS
Hi,
I have the following VBA code from @Peter_SSs from another thread that generates unique combinations. However, the VBA omits combinations with repeated elements. For example, if I have elements A, B, and C then AA, BB, CC are omitted. I'm looking for some help modifying the VBA such that it retains the combinations with repeated elements. Thanks!

VBA Code:
Sub All2Combos()
  Dim a As Variant, b As Variant
  Dim i As Long, j As Long, x As Long, y As Long
 
  a = Range("A2", Range("A" & Rows.Count).End(xlUp)).Value
  ReDim b(1 To UBound(a))
  For i = 1 To UBound(a)
    If Len(a(i, 1)) > 0 Then
      x = x + 1: b(x) = a(i, 1)
    End If
  Next i
  ReDim a(1 To WorksheetFunction.Combin(x, 2), 1 To 1)
  For i = 1 To x - 1
    For j = i + 1 To x
      y = y + 1: a(y, 1) = b(i) & b(j)
    Next j
  Next i
  Range("C2").Resize(y).Value = a
End Sub
 

Excel Facts

Excel Wisdom
Using a mouse in Excel is the work equivalent of wearing a lanyard when you first get to college
Try this:
VBA Code:
Sub All2Combos()
'AA,BB,CC
  Dim a As Variant, b As Variant
  Dim i As Long, j As Long, x As Long, y As Long
  a = Range("A2", Range("A" & Rows.Count).End(xlUp)).Value
  ReDim b(1 To UBound(a))
  For i = 1 To UBound(a)
    If Len(a(i, 1)) > 0 Then
      x = x + 1: b(x) = a(i, 1)
    End If
  Next i
  ReDim a(1 To x * x, 1 To 1)
  For i = 1 To x
    For j = 1 To x
      y = y + 1
       a(y, 1) = b(i) & b(j)
    Next j
  Next i
  Range("C2").Resize(y).Value = a
End Sub
 
Upvote 0
Why over complicate it?

VBA Code:
Sub AllTwoComboTest()
'
    Dim Array1Slot  As Long, Array2Slot As Long
    Dim ComboList   As Object
    Dim Array1      As Variant, Array2  As Variant
'
    Set ComboList = CreateObject("System.Collections.ArrayList")                                ' Initialize CombList
'
    Array1 = Range("A2:A" & Range("A" & Rows.Count).End(xlUp).Row)                              ' Load Colun A range into Array1
    Array2 = Range("A2:A" & Range("A" & Rows.Count).End(xlUp).Row)                              ' Load Colun A range into Array2
'
    For Array1Slot = 1 To UBound(Array1)                                                        ' Initialize Array1 loop
        For Array2Slot = 1 To UBound(Array2)                                                    '   Initialize Array2 loop
            ComboList.Add Array2(Array2Slot, 1) & Array1(Array1Slot, 1)                         '       Save Combo into ComboList
        Next                                                                                    '   Loop back
    Next                                                                                        ' Loop back
'
    Range("E2").Resize(ComboList.Count, 1).Value = Application.Transpose(ComboList.ToArray)     ' Display ComboList to column E
'
End Sub
 
Upvote 0
Why over complicate it?

VBA Code:
Sub AllTwoComboTest()
'
    Dim Array1Slot  As Long, Array2Slot As Long
    Dim ComboList   As Object
    Dim Array1      As Variant, Array2  As Variant
'
    Set ComboList = CreateObject("System.Collections.ArrayList")                                ' Initialize CombList
'
    Array1 = Range("A2:A" & Range("A" & Rows.Count).End(xlUp).Row)                              ' Load Colun A range into Array1
    Array2 = Range("A2:A" & Range("A" & Rows.Count).End(xlUp).Row)                              ' Load Colun A range into Array2
'
    For Array1Slot = 1 To UBound(Array1)                                                        ' Initialize Array1 loop
        For Array2Slot = 1 To UBound(Array2)                                                    '   Initialize Array2 loop
            ComboList.Add Array2(Array2Slot, 1) & Array1(Array1Slot, 1)                         '       Save Combo into ComboList
        Next                                                                                    '   Loop back
    Next                                                                                        ' Loop back
'
    Range("E2").Resize(ComboList.Count, 1).Value = Application.Transpose(ComboList.ToArray)     ' Display ComboList to column E
'
End Sub
Thanks for the solution, but your code outputs both combinations: AB and BA. I want only either AB or BA but not both.
 
Upvote 0
Try this:
VBA Code:
Sub All2Combos()
'AA,BB,CC
  Dim a As Variant, b As Variant
  Dim i As Long, j As Long, x As Long, y As Long
  a = Range("A2", Range("A" & Rows.Count).End(xlUp)).Value
  ReDim b(1 To UBound(a))
  For i = 1 To UBound(a)
    If Len(a(i, 1)) > 0 Then
      x = x + 1: b(x) = a(i, 1)
    End If
  Next i
  ReDim a(1 To x * x, 1 To 1)
  For i = 1 To x
    For j = 1 To x
      y = y + 1
       a(y, 1) = b(i) & b(j)
    Next j
  Next i
  Range("C2").Resize(y).Value = a
End Sub
Thanks for the code but it's outputting permutations instead of combinations. For example, it's outputting AB and BA which are the same. I only want either AB or BA. Thanks
 
Upvote 0
How about:

VBA Code:
Sub ModifiedAll2Combos()
  Dim a As Variant, b As Variant
  Dim i As Long, j As Long, x As Long, y As Long
 
  a = Range("A2", Range("A" & Rows.Count).End(xlUp)).Value
  ReDim b(1 To UBound(a))
  For i = 1 To UBound(a)
    If Len(a(i, 1)) > 0 Then
      x = x + 1
      b(x) = a(i, 1)
    End If
  Next i
  ReDim a(1 To WorksheetFunction.Combina(x, 2), 1 To 1)
  For i = 1 To WorksheetFunction.Combina(x, 2) - 1
    For j = i To x
      y = y + 1
      a(y, 1) = b(i) & b(j)
    Next j
  Next i
  Range("C2").Resize(y).Value = a
End Sub
 
Upvote 0
Solution
How about:

VBA Code:
Sub ModifiedAll2Combos()
  Dim a As Variant, b As Variant
  Dim i As Long, j As Long, x As Long, y As Long
 
  a = Range("A2", Range("A" & Rows.Count).End(xlUp)).Value
  ReDim b(1 To UBound(a))
  For i = 1 To UBound(a)
    If Len(a(i, 1)) > 0 Then
      x = x + 1
      b(x) = a(i, 1)
    End If
  Next i
  ReDim a(1 To WorksheetFunction.Combina(x, 2), 1 To 1)
  For i = 1 To WorksheetFunction.Combina(x, 2) - 1
    For j = i To x
      y = y + 1
      a(y, 1) = b(i) & b(j)
    Next j
  Next i
  Range("C2").Resize(y).Value = a
End Sub
That works. Thanks!
 
Upvote 0

Forum statistics

Threads
1,223,243
Messages
6,170,971
Members
452,371
Latest member
Frana

We've detected that you are using an adblocker.

We have a great community of people providing Excel help here, but the hosting costs are enormous. You can help keep this site running by allowing ads on MrExcel.com.
Allow Ads at MrExcel

Which adblocker are you using?

Disable AdBlock

Follow these easy steps to disable AdBlock

1)Click on the icon in the browser’s toolbar.
2)Click on the icon in the browser’s toolbar.
2)Click on the "Pause on this site" option.
Go back

Disable AdBlock Plus

Follow these easy steps to disable AdBlock Plus

1)Click on the icon in the browser’s toolbar.
2)Click on the toggle to disable it for "mrexcel.com".
Go back

Disable uBlock Origin

Follow these easy steps to disable uBlock Origin

1)Click on the icon in the browser’s toolbar.
2)Click on the "Power" button.
3)Click on the "Refresh" button.
Go back

Disable uBlock

Follow these easy steps to disable uBlock

1)Click on the icon in the browser’s toolbar.
2)Click on the "Power" button.
3)Click on the "Refresh" button.
Go back
Back
Top