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Excel Randbetween function without repeat

Posted on 2014-12-03
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is there any excel function that i can use, where in a range of cells it does not give me a repeated number.

for example in a range of 200 cells, i want to put a random number from 100 to 1000000 and i do not want repeated.

is this possible?
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Question by:Flora
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Glenn Ray earned 2000 total points
ID: 40479056
Well, you can do this with a couple of functions, but given the range of numbers you want to generate, I don't recommend this as it involves both the RANDBETWEEN function (real-time recalculation with any worksheet change) and an array function.  

But for the sake of discussion:
1) in cell A1: =RANDBETWEEN(100,1000000)
2) IN CELL A2:  =LARGE(ROW($100:$1000000)*NOT(COUNTIF($A$1:A1,ROW($100:$1000000))),RANDBETWEEN(1,(1000000+2-101)-ROW(A1))) (entered as array function with [Ctrl]+[Shift]+[Enter]).
3) Copy cell A2 and paste into A3:A200.

WARNING! This will likely take several minutes to process!  I recommend trying with on just ten-twenty rows so you can see why...it recalculates all values each iteration.

-Glenn
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LVL 27

Expert Comment

by:Glenn Ray
ID: 40479124
What you really want is a VBA method to do this:
Option Explicit
Sub Unique_Random()
    Dim r As Integer
    Dim lngLow, lngHigh, lngRand As Long
    Dim rng As Range
    Dim cl As Object
    
    lngLow = 100
    lngHigh = 1000000
    Range("A1").Select
    For r = 1 To 200
        Do
            lngRand = Application.WorksheetFunction.RandBetween(lngLow, lngHigh)
            Set rng = Range("A1:A" & r)
            Set cl = rng.Find(lngRand)
        Loop While Not cl Is Nothing
        Cells(r, 1).Value = lngRand
    Next r
End Sub

Open in new window


Runs incredibly fast and inserts values instead of functions.

Regards,
-Glenn
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Author Closing Comment

by:Flora
ID: 40479699
thank you Glenn
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