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From: Larry Serflaten on 3 Jun 2010 08:19

"Dave O." <nobody(a)nowhere.com> wrote

> you must ignore permutations where (in this example) j, k or m are the same,

Aaah, something of a scrabble shuffler then....

Try this with a listbox on a new form:

LFS


Private Sub Form_Load()
Dim itm

For Each itm In Shuffle("ABCDEF", 4)
List1.AddItem itm
Next
End Sub

Function Shuffle(List As String, Length As Long) As Collection
Dim max As Long, idx As Long, ltr As Long
Dim txt As String, use As Boolean
' Returns a collection of strings that are <Length> characters long
' containing all combinations of unique characters from <List>

max = Len(List)
ReDim p(0 To Length) As Long
Set Shuffle = New Collection

txt = String(Length, " ")
For idx = 1 To Length
p(idx) = 1
Next

idx = Length
While idx > 0
use = True
ReDim c(1 To max) As Long
For ltr = 1 To Length
Mid(txt, ltr, 1) = Mid(List, p(ltr), 1)
c(p(ltr)) = c(p(ltr)) + 1
If c(p(ltr)) > 1 Then
use = False
Exit For
End If
Next
If use Then Shuffle.Add txt
idx = Length
p(idx) = p(idx) + 1
While p(idx) > max
p(idx) = 1
idx = idx - 1
p(idx) = p(idx) + 1
Wend
Wend

End Function




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