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# excel – Poker Dealer Logic

Questions:

I’d like to use Excel as my poker dealer. Here is the code that will generate 20 random numbers (cards) between 1 and 52. Output of first 20 numbers/cards is in column A1:A20. I’d like to have the next set of 20 numbers/cards generated in A22:A41, 3rd A43:A62, and so on. How can the code be fixed so that it displays 1000 hands in column A with one row separating each set? Thank you.

``````Sub cards()

Range("A:A").Clear

cardstodraw = 20

For x = 1 To cardstodraw

begL:
ActiveSheet.Cells(1, 2) = "=Randbetween(1,52)"
ActiveSheet.Cells(x, 1) = ActiveSheet.Cells(1, 2).Text
cardvalue = ActiveSheet.Cells(x, 1)
y = 1
Count = 0
Do Until ActiveSheet.Cells(y, 1) = ""
If ActiveSheet.Cells(y, 1) = cardvalue Then
Count = Count + 1
End If:  y = y + 1:  Loop
If Count > 1 Then GoTo begL

Next

Range("B1").Clear

End Sub
``````

Your code is somewhat convoluted (using `GoTo` is usually an indication that something can be improved). For getting a sample of size 20 from 1-52, use a modified Fisher-Yates shuffle:

``````Option Explicit 'you really should be using this

Function deal(n As Long, k As Long) As Variant
'returns an array of length k
'consisting of k numbers in the range 1 to n

Dim deck As Variant
Dim i As Long, j As Long, temp As Long

ReDim deck(1 To n)
For i = 1 To n
deck(i) = i
Next i

With Application.WorksheetFunction
'do k steps of a Fisher-Yates shuffle on deck
For i = 1 To .Min(k, n - 1)
j = .RandBetween(i, n)
If i < j Then 'swap
temp = deck(i)
deck(i) = deck(j)
deck(j) = temp
End If
Next i
End With

ReDim Preserve deck(1 To k)
deal = deck
End Function
``````

If you want to have 1000 hands in Column A:

``````Sub ManyHands()
Dim i As Long
With Application.WorksheetFunction
For i = 1 To 1000
Range(Cells(1 + 21 * (i - 1), 1), Cells(21 * i - 1, 1)).Value = .Transpose(deal(52, 20))
Next i
End With
End Sub
``````

On Edit Here is a modified version of the code, one which deals cards to multiple players:

``````Function deal(n As Long, k As Long, players As Long) As Variant
'returns an array with k rows and players columns
'consisting of k*players numbers in range 1 to n
'if players = 1, then the array is 1-dimensional
'otherwise it is 2-dimensional

Dim deck As Variant
Dim i As Long, j As Long, temp As Long
Dim hands As Variant

ReDim deck(1 To n)
For i = 1 To n
deck(i) = i
Next i

With Application.WorksheetFunction
'do k*players steps of a Fisher-Yates shuffle on deck
For i = 1 To .Min(k * players, n - 1)
j = .RandBetween(i, n)
If i < j Then 'swap
temp = deck(i)
deck(i) = deck(j)
deck(j) = temp
End If
Next i
End With

ReDim Preserve deck(1 To k * players)
If players = 1 Then
deal = deck
Exit Function
Else
ReDim hands(1 To k, 1 To players)
For i = 1 To k
For j = 1 To players
hands(i, j) = deck(players * (i - 1) + j)
Next j
Next i
deal = hands
End If
End Function
``````

It could be used like:

``````Sub ManyHands()
Dim i As Long
For i = 1 To 1000
Range(Cells(1 + 11 * (i - 1), 1), Cells(11 * i - 1, 2)).Value = deal(52, 10, 2)
Next i
End Sub
``````

Try:

``````Sub cards()
Dim cardstodraw  As Long, numberofhands As Long, i As Long, j As Long, k As Long
cardstodraw = 20
numberofhands = 50
Range("A:A").Clear
With Application.WorksheetFunction
For j = 0 To numberofhands - 1
For i = 1 To cardstodraw
begL:
Cells(i + k + (j * cardstodraw), 1) = .RandBetween(1, 52)
If .CountIf(Range(Cells(1 + k + (j * cardstodraw), 1), Cells(20 + k + (j * cardstodraw), 1)), Cells(i + k + (j * cardstodraw), 1)) > 1 Then GoTo begL
Next i
k = k + 1
Next j
End With

End Sub
``````