Solved

Random numbers in an array in VBScript

Posted on 2010-11-10
3
1,123 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 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

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

Technology Partners: We Want Your Opinion!

We value your feedback.

Take our survey and automatically be enter to win anyone of the following:
Yeti Cooler, Amazon eGift Card, and Movie eGift Card!

Question has a verified solution.

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

Welcome, welcome!  If you are new to the series and haven't been following along, please take a brief moment to review the first three installments: Part 1 (http://www.experts-exchange.com/Programming/Languages/Visual_Basic/VB_Script/A_266-VBScri…
When you see single cell contains number and text, and you have to get any date out of it seems like cracking our heads.
Come and listen to Percona CEO Peter Zaitsev discuss what’s new in Percona open source software, including Percona Server for MySQL (https://www.percona.com/software/mysql-database/percona-server) and MongoDB (https://www.percona.com/software/mongo-…
This is my first video review of Microsoft Bookings, I will be doing a part two with a bit more information, but wanted to get this out to you folks.

688 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