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Re: card dealer

From Dave Angel <davea@davea.name>
Subject Re: card dealer
Date 2013-09-27 21:00 +0000
References <0617088e-5aa3-4c5d-b660-22040ee858a1@googlegroups.com> <l23q0r$u27$1@ger.gmane.org> <mailman.380.1380283737.18130.python-list@python.org> <l24am7$j2k$2@dont-email.me>
Newsgroups comp.lang.python
Message-ID <mailman.392.1380315681.18130.python-list@python.org> (permalink)

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On 27/9/2013 12:10, Denis McMahon wrote:

> On Fri, 27 Sep 2013 12:08:33 +0000, Dave Angel wrote:
>
>> i recall
>> writing a shuffle function in C decades ago, which took an array of (52)
>> unique items and put them in random order.
>
> Whenever I tried to write shuffles I came up against a fairly fundamental 
> limit:
>
> 52! > prng states
>
> Granted prngs seem to be better on the importing entropy from elsewhere 
> front these days.
>

in 1978, I implemented a random number generator that the OS sequenced
through between scheduling processes, so that any individual process
would be relatively safe from that phenomenon. Of course I was limited
to the precision of the math package - 10**13

-- 
DaveA

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Thread

card dealer markotaht@gmail.com - 2013-09-27 03:24 -0700
  Re: card dealer Dave Angel <davea@davea.name> - 2013-09-27 11:26 +0000
  Re: card dealer MRAB <python@mrabarnett.plus.com> - 2013-09-27 12:27 +0100
  Re: card dealer Alister <alister.ware@ntlworld.com> - 2013-09-27 11:41 +0000
  Re: card dealer Dave Angel <davea@davea.name> - 2013-09-27 12:08 +0000
    Re: card dealer Denis McMahon <denismfmcmahon@gmail.com> - 2013-09-27 16:10 +0000
      Re: card dealer Dave Angel <davea@davea.name> - 2013-09-27 21:00 +0000
      Re: card dealer Ned Batchelder <ned@nedbatchelder.com> - 2013-09-27 17:40 -0400
        Re: card dealer Steven D'Aprano <steve+comp.lang.python@pearwood.info> - 2013-09-28 06:01 +0000
          Re: card dealer Ned Batchelder <ned@nedbatchelder.com> - 2013-09-28 06:31 -0400
          Re: card dealer Dave Angel <davea@davea.name> - 2013-09-28 12:56 +0000
          Re: card dealer Antoon Pardon <antoon.pardon@rece.vub.ac.be> - 2013-09-28 16:49 +0200
            Re: card dealer Tim Roberts <timr@probo.com> - 2013-09-28 17:04 -0700

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