?
Solved

Random numbers in an array in VBScript

Posted on 2010-11-10
3
Medium Priority
?
1,142 Views
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
...
0
Comment
Question by:onemorecoke
[X]
Welcome to Experts Exchange

Add your voice to the tech community where 5M+ people just like you are talking about what matters.

  • Help others & share knowledge
  • Earn cash & points
  • Learn & ask questions
3 Comments
 
LVL 20

Accepted Solution

by:
ltlbearand3 earned 2000 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

Open in new window

0
 
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.
0
 
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

Open in new window

0

Featured Post

Free Tool: IP Lookup

Get more info about an IP address or domain name, such as organization, abuse contacts and geolocation.

One of a set of tools we are providing to everyone as a way of saying thank you for being a part of the community.

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

Recently I finished a vbscript that I thought I'd share.  It uses a text file with a list of server names to loop through and get various status reports, then writes them all into an Excel file.  Originally it was put together for our Altiris server…
Over the years I have built up my own little library of code snippets that I refer to when programming or writing a script.  Many of these have come from the web or adaptations from snippets I find on the Web.  Periodically I add to them when I come…
This tutorial will teach you the special effect of super speed similar to the fictional character Wally West aka "The Flash" After Shake : http://www.videocopilot.net/presets/after_shake/ All lightning effects with instructions : http://www.mediaf…
Sometimes it takes a new vantage point, apart from our everyday security practices, to truly see our Active Directory (AD) vulnerabilities. We get used to implementing the same techniques and checking the same areas for a breach. This pattern can re…
Suggested Courses

752 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question