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developerWorks  >  Lotus  >  Forums & community  >  Notes/Domino 6 and 7 Forum

Notes/Domino 6 and 7 Forum

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Randomly select document from view
Stan Rogers 3.Sep.13 07:12 AM a Web browser
Applications Development All Releases All Platforms


As Carl mentioned, you are probably not getting 28 *distinct* random numbers. There is an off-by-one error as well, since

For x = 0 To 28

actually produces 29 iterations. You'll need to create a list of random numbers first, making sure that there are 28 of them, all unique, then run through the list to get the corresponding documents. The easiest way to do that is using a List:

Dim entryNumberList List As Long
Dim randomNumber As Long
Dim randomTag As String
Dim entryNumberCount as Integer
entryNumberCount = 0

Do Until entryNumberCount = 28
randomNumber = Clng(totalInView * Rnd()) + 1
randomTag = Cstr(randomNumber)
If Not Iselement entryNumberList(randomTag)
entryNumberList(randomTag) = randomNumber
entryNumberCount = entryNumberCount + 1
End If
Loop

Then you can use a Forall on the list to get your documents.

This may not be the most efficient way of doing things, but it is the most readable and maintainable. Changing the range and the number of numbers chosen is very easy, and the time complexity (which should be O(log n)) means that things won't get out of control slow as the number of choices increases (at least up to the point where new choices are more likely to be hits than misses).

[EDIT: an error in the code could have resulted in a 0 and would have made the last document in the view unreachable; adding one to the truncated random number fixes it.]




Randomly select document from view ... (Rebecka Anderss... 3.Sep.13)
. . Your code could randomly select the... (Carl Tyler 3.Sep.13)
. . . . RE: Your code could randomly select... (Rebecka Anderss... 3.Sep.13)
. . Randomly select document from view (Stan Rogers 3.Sep.13)
. . . . RE: Randomly select document from v... (Rebecka Anderss... 3.Sep.13)


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