Random Number from select range

wayne0881

Board Regular
Joined
Nov 2, 2009
Messages
95
Office Version
  1. 2016
Platform
  1. Windows
Hi All,

I am looking at creating a random number draw with no repeats

in cell A1 i have =RANDBETWEEN(MIN($B$1,$B$2),MAX($B$1,$B$2))
in cell B1 and B2 I have my range. (which for this exercise is between 1-4)

I have a button in C1 which has VBA Application.calculate which basically picks a random between the range.

In C5 i would like another button which will again calculate a random number between the range but omit the value in A1 and return the value in A5 - this will then make sure there are no repeats drawn. (any suggestions on the VBA behind the button for cell C5)

Thanks in advance
 

Excel Facts

Format cells as time
Select range and press Ctrl+Shift+2 to format cells as time. (Shift 2 is the @ sign).
The formula in A1 is volatile and will change EVERY time any other cell changes
- I do not think you want a formula in A1

How about

random number in A1
Code:
Sub Button1_Click()
    [A1] = Evaluate("RANDBETWEEN(MIN($B$1,$B$2),MAX($B$1,$B$2))")
End Sub

a different random number in A5
Code:
Sub Button2_Click()
    Dim v As Integer
    Do
        v = Evaluate("RANDBETWEEN(MIN($B$1,$B$2),MAX($B$1,$B$2))")
        If [A1] <> v Then
            [A5] = v
            Exit Do
        End If
    Loop
End Sub
 
Upvote 0
The formula in A1 is volatile and will change EVERY time any other cell changes
- I do not think you want a formula in A1

How about

random number in A1
Code:
Sub Button1_Click()
    [A1] = Evaluate("RANDBETWEEN(MIN($B$1,$B$2),MAX($B$1,$B$2))")
End Sub

a different random number in A5
Code:
Sub Button2_Click()
    Dim v As Integer
    Do
        v = Evaluate("RANDBETWEEN(MIN($B$1,$B$2),MAX($B$1,$B$2))")
        If [A1] <> v Then
            [A5] = v
            Exit Do
        End If
    Loop
End Sub

ok great - I will give this a try
 
Upvote 0
You can leave your A1 formula in if you like, and use this formula in A5:

=AGGREGATE(15,6,ROW(INDIRECT(B1&":"&B2))/(COUNTIF(A1,ROW(INDIRECT(B1&":"&B2)))=0),RANDBETWEEN(1,ABS(B2-B1)-1))

That guarantees a random number between B1 and B2, excluding A1. An extension of that can be used to list all the numbers from B1 to B2 in random order.
 
Upvote 0
The formula in A1 is volatile and will change EVERY time any other cell changes
- I do not think you want a formula in A1

How about

random number in A1
Code:
Sub Button1_Click()
    [A1] = Evaluate("RANDBETWEEN(MIN($B$1,$B$2),MAX($B$1,$B$2))")
End Sub

a different random number in A5
Code:
Sub Button2_Click()
    Dim v As Integer
    Do
        v = Evaluate("RANDBETWEEN(MIN($B$1,$B$2),MAX($B$1,$B$2))")
        If [A1] <> v Then
            [A5] = v
            Exit Do
        End If
    Loop
End Sub

If I wanted to add a third button to omit A1 and also A5 in A6 do I just add another if statement underneath?
 
Upvote 0
You can leave your A1 formula in if you like, and use this formula in A5:

=AGGREGATE(15,6,ROW(INDIRECT(B1&":"&B2))/(COUNTIF(A1,ROW(INDIRECT(B1&":"&B2)))=0),RANDBETWEEN(1,ABS(B2-B1)-1))

That guarantees a random number between B1 and B2, excluding A1. An extension of that can be used to list all the numbers from B1 to B2 in random order.


Thanks I will try this also :)
 
Upvote 0
I don't know what you have in A2:A4, but if they don't contain numbers in the range defined by B1:B1, this is how to extend the formula. Put this formula in A5:

=AGGREGATE(15,6,ROW(INDIRECT(B$1&":"&B$2))/(COUNTIF($A$1:$A4,ROW(INDIRECT(B$1&":"&B$2)))=0),RANDBETWEEN(1,ABS(B$2-B$1)-ROWS(A$5:A5)+1))

and copy it down the column as far as you want.
 
Upvote 0

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