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shuffle array

Posted on 2001-07-20
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Last Modified: 2012-05-04
i have an array of ten digits
digitarray(10)
and i want to shuffle it
any ideas how its done?
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Question by:amoran
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6 Comments
 
LVL 22

Expert Comment

by:CJ_S
ID: 6301751
Define shuffle

regards,
CJ
0
 

Author Comment

by:amoran
ID: 6301782
currently
digitarray(10)=("1", "2", ....., "10")
i want it to become something like
digitarray(10)=("8", "4", ....., "7")
like shuffling a deck of cards

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LVL 10

Expert Comment

by:makerp
ID: 6301785
heres an example of how to remove all null values from an array and condense it down,

<%

Function cleanArray(tarr)
      arr = tarr
      FOR i = 0 TO UBOUND(arr)
            IF(arr(i) = "" AND i < UBOUND(arr))THEN
                  arr(i) = arr(i + 1)
                  arr(i + 1) = ""     
            END IF            
      NEXT
      count = 0
      FOR i = 0 TO UBOUND(arr)
            IF(arr(i) <> "")THEN
                  count = count + 1      
            END IF            
      NEXT
      REDIM PRESERVE arr(count)
      cleanArray = arr
End Function

dim arra(6)
arra(0) = "Hello"
arra(1) = "Hi"
arra(2) = "asp"
arra(3) = ""
arra(4) = "weeeee"
arra(5) = ""

'narra will now be a clean version of arra
narra = cleanArray(arra)

FOR i = 0 TO UBOUND(narra)
      Response.Write(narra(i) & "<BR>")    
NEXT

%>
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LVL 3

Expert Comment

by:dragosh
ID: 6301950
an ideea : generate 2 random numbers and switch values in the array .. if you repeat this process for <<n>> times will will get what you want ..

rgds
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LVL 10

Expert Comment

by:makerp
ID: 6301977
providing you dont reuse random numbers!, quite possible
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LVL 3

Accepted Solution

by:
dragosh earned 300 total points
ID: 6301990
here is some code :


<%@ Language=VBScript %>
<%Option Explicit%>

<%
Dim digitArray
Dim i

digitArray = Array("1", "2", "3", "4", "5", "6", "7", "8", "9", "10")

' initial vector
For i = 0 To UBound(digitArray)
     Response.Write "digitArray[" & i & "] = " & digitArray(i) & "<br>"
Next

' shuffle
Dim n, k
Dim rnd1, rnd2
Dim minValue
Dim maxValue
Dim buf

minValue = 1
maxValue = 9
n = 10

' initialize generator
Randomize

For k = 1 To n

     rnd1 = CInt((maxValue * Rnd) + minValue)
     rnd2 = CInt((maxValue * Rnd) + minValue)
     
     If rnd1 <> rnd2 Then
          buf = digitArray(rnd1-1)
          digitArray(rnd1-1) = digitArray(rnd2-1)
          digitArray(rnd2-1) = buf
     Else
          k = k - 1
     End If
Next

' shuffle vector
For i = 0 To UBound(digitArray)
     Response.Write "digitArray[" & i & "] = " & digitArray(i) & "<br>"
Next

%>


hope this will help

rgds
0

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