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Random numbers in an array in VBScript

Posted on 2010-11-10
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Last Modified: 2012-05-10
In vbscript, I need a function that will fill an array with random numbers but not repeating.  For instance, if I have 9 numbers, the numbers in the array need to be from 1 to 10.  Example:

Trial #1: 4,1,6,3,9,8,2,5,7
Trail #2: 9,3,1,4,5,7,2,6,8
...
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Question by:onemorecoke
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3 Comments
 
LVL 20

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ltlbearand3 earned 500 total points
ID: 34107603
I would use the dictionary object so that you can check if the number has already been added to the array.  Here is some sample code for you.  Now a slight warning - this is based of a random number generator.  It could "get stuck" running in the loop until it randomly generates a missing number.



Option Explicit
Dim dicNum, i, blnAdded, intNum, myvalue, strMsg

Set dicNum = CreateObject("Scripting.Dictionary")

For i = 0 to 9
	blnAdded = False
	Do until blnAdded
		intNum = Cint(Rnd()*10)
		intNum = Cint(Rnd()*10)
		If not dicNum.Exists(intNum) Then
			blnAdded = True
			dicNum.Add intNum, intNum
		End If
	Loop
Next

For each myvalue in dicNum.Items
	strMsg = strMsg & " : " & myvalue
Next

msgbox strMsg

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LVL 86

Expert Comment

by:Mike Tomlinson
ID: 34107920
...or you can just FILL the array with 1 to 10. then SHUFFLE it by swapping random indices.
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LVL 13

Expert Comment

by:Daz_1234
ID: 34110566
Interesting puzzle!

Here's my go.  Once it uses a number from 1 to 10, it removes that number so it cannot be chosen again.

Regards,
Daz.
Option Explicit

Dim arrTrial(10), strTrial, dicNums, i, arrNums, iNum

Randomize
Set dicNums = CreateObject("Scripting.Dictionary")

'# Load dictionary with 1 to 10
For i = 1 to 10
    dicNums(i) = i
Next

'# Load arrTrial array with random elements from dictionary, removing the element from the dictionary whenever it is used
Do
    i = dicNums.Count
    arrNums = dicNums.Keys
    iNum = Int(Rnd()*i + 1) - 1
    arrTrial(i - 1) = arrNums(iNum)
    dicNums.Remove(arrNums(iNum))
    If dicNums.Count <1 Then Exit Do
Loop




'#  Test the array

strTrial = Join(arrTrial, " ")

MsgBox "arrTrial = " & strTrial

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