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Re: Random permutations [was Re: Libraries for sysadmins?]

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From Sebastian <news@seyweiler.dyndns.org>
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Subject Re: Random permutations [was Re: Libraries for sysadmins?]
Date Sat, 05 Mar 2016 16:41:42 +0100
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Am 05.03.2016 12:11, schrieb Robert Klemme:
> On 05.03.2016 00:56, Sebastian wrote:
>
>> This is good if you need about as many elements in the result as are in
>> the range. But if the range is large and you need only a few elements,
>> it may be better to generate numbers (without duplicates), like this:
>>
>> new Random().ints(1, 50).distinct().limit(6)
>
> Are you sure this has the same probability characteristics as picking
> six random items from a list of 49?
>
> Cheers
>
>      robert

I think yes, because Random#ints() is evenly distributed. And as I said, 
this is useful when the range is much larger than the sample size. The 
farther they diverge, the smaller the probability of a collision would 
become in the first place.

-- Sebastian

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Thread

Libraries for sysadmins? Elena <egarrulo@gmail.com> - 2016-03-04 03:33 -0800
  Re: Libraries for sysadmins? Martin Gregorie <martin@address-in-sig.invalid> - 2016-03-04 11:44 +0000
    Re: Libraries for sysadmins? egarrulo <egarrulo@gmail.com> - 2016-03-04 12:56 +0100
  Re: Libraries for sysadmins? Eric Sosman <esosman@comcast-dot-net.invalid> - 2016-03-04 07:43 -0500
  Re: Libraries for sysadmins? Robert Klemme <shortcutter@googlemail.com> - 2016-03-04 18:06 +0100
    Re: Libraries for sysadmins? egarrulo <egarrulo@gmail.com> - 2016-03-04 20:30 +0100
      Random permutations [was Re: Libraries for sysadmins?] Sebastian <news@seyweiler.dyndns.org> - 2016-03-05 00:56 +0100
        Re: Random permutations [was Re: Libraries for sysadmins?] Robert Klemme <shortcutter@googlemail.com> - 2016-03-05 12:11 +0100
          Re: Random permutations [was Re: Libraries for sysadmins?] Sebastian <news@seyweiler.dyndns.org> - 2016-03-05 16:41 +0100
            Re: Random permutations [was Re: Libraries for sysadmins?] Brixomatic <brixomatic@yahoo.com> - 2016-03-05 19:20 +0100
              Re: Random permutations [was Re: Libraries for sysadmins?] Andreas Leitgeb <avl@logic.at> - 2016-03-05 18:46 +0000
                Re: Random permutations [was Re: Libraries for sysadmins?] Brixomatic <brixomatic@yahoo.com> - 2016-03-15 19:22 +0100
                Re: Random permutations [was Re: Libraries for sysadmins?] Andreas Leitgeb <avl@logic.at> - 2016-03-15 22:30 +0000
            Re: Random permutations [was Re: Libraries for sysadmins?] Andreas Leitgeb <avl@logic.at> - 2016-03-05 18:30 +0000
              Re: Random permutations [was Re: Libraries for sysadmins?] Eric Sosman <esosman@comcast-dot-net.invalid> - 2016-03-05 13:46 -0500
                Re: Random permutations [was Re: Libraries for sysadmins?] Andreas Leitgeb <avl@logic.at> - 2016-03-05 19:40 +0000
      Re: Libraries for sysadmins? Robert Klemme <shortcutter@googlemail.com> - 2016-03-05 12:10 +0100
    Re: Libraries for sysadmins? Arne Vajhøj <arne@vajhoej.dk> - 2016-03-04 21:42 -0500
  Re: Libraries for sysadmins? Arne Vajhøj <arne@vajhoej.dk> - 2016-03-04 21:48 -0500

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