Groups > comp.sys.acorn.programmer > #5778

Re: Specific numbers but in a random sequence

From	Richard Ashbery <basura@invalid.addr.uk>
Newsgroups	comp.sys.acorn.programmer
Subject	Re: Specific numbers but in a random sequence
Date	2019-06-22 18:21 +0100
Organization	None
Message-ID	<57c8384f3bbasura@invalid.addr.uk> (permalink)
References	<57c7c5d6c0basura@invalid.addr.uk> <qeji40$7ca$1@dont-email.me> <qel12p$ibq$1@dont-email.me> <57c82fa1bdbasura@invalid.addr.uk> <qeljvl$1i81$1@gioia.aioe.org>

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In article <qeljvl$1i81$1@gioia.aioe.org>,
   Someone Somewhere <nntpac@gmail.com> wrote:
> On 22/06/2019 16:46, Richard Ashbery wrote:
> > In article <qel12p$ibq$1@dont-email.me>,
> >     druck <news@druck.org.uk> wrote:
> >> On 21/06/2019 22:27, Gavin Crawford wrote:
> >>> Richard Ashbery <basura@invalid.addr.uk> Wrote in message:
> > 
> > [snip]
> > 
> > 3,4,5,6,8,9,10,12,15,18,20,24,30,36,45,60,90,120I would like to be
> > able to use these variables in a random sequence.
> > 
> >>> Why not put them into an array and use a random number to choose
> >>>    the array index.
> > 
> >> Yes, and make sure you seed the random number generator, or it may
> >> always go through the same pseudo random sequence each time its run.
> > 
> >> IIRC to seed do RND(-TIME) before any other call to RND.
> > 
> > Not quite there yet - if I use the following...
> > 
> > DIM array%(18)
> > array%() = 3,4,5,6,8,9,10,12,15,18,20,24,30,36,45,60,90,120
> > y = RND(-TIME)
> > FOR loop = 1 TO 5
> > FOR I% = 0 TO 18
> > PRINT array%(RND(I%))
> > NEXT I%
> > NEXT loop
> > 
> > 90 random numbers gives poor distribution:

[snip]

> > 
> > Is there any way of improving it?
> > 
> Does it always give such a poor distribution,  even across multiple 
> runs?    

Yes

> What about if you did RND(someBigNumber) MOD 18 ?

RND(500)MOD18 for example appears to improve the distribution. How
can I incorporate this idea with my 18 specific numbers in the array?

Richard

Thread

Specific numbers but in a random sequence Richard Ashbery <basura@invalid.addr.uk> - 2019-06-21 21:31 +0100
  Re:Specific numbers but in a random sequence Gavin Crawford <gc@dentrassis.com> - 2019-06-21 22:27 +0100
    Re: Specific numbers but in a random sequence druck <news@druck.org.uk> - 2019-06-22 11:48 +0100
      Re: Specific numbers but in a random sequence Richard Ashbery <basura@invalid.addr.uk> - 2019-06-22 12:03 +0100
      Re: Specific numbers but in a random sequence Richard Ashbery <basura@invalid.addr.uk> - 2019-06-22 16:46 +0100
        Re: Specific numbers but in a random sequence Someone Somewhere <nntpac@gmail.com> - 2019-06-22 17:11 +0100
          Re: Specific numbers but in a random sequence Richard Ashbery <basura@invalid.addr.uk> - 2019-06-22 18:21 +0100
            Re: Specific numbers but in a random sequence Steve Fryatt <news@stevefryatt.org.uk> - 2019-06-22 21:29 +0100
              Re: Specific numbers but in a random sequence Richard Ashbery <basura@invalid.addr.uk> - 2019-06-23 11:17 +0100
                Re: Specific numbers but in a random sequence Ian <Ian.Hamilton@AAUG.net> - 2019-06-23 12:07 +0100
                Re: Specific numbers but in a random sequence Paul Oates <oatespaul@btinternet.com> - 2019-06-23 13:17 +0100
                Re: Specific numbers but in a random sequence Steve Fryatt <news@stevefryatt.org.uk> - 2019-06-23 13:51 +0100
                Re: Specific numbers but in a random sequence Richard Ashbery <basura@invalid.addr.uk> - 2019-06-23 14:10 +0100
                Re: Specific numbers but in a random sequence Steve Fryatt <news@stevefryatt.org.uk> - 2019-06-23 15:59 +0100
                Re: Specific numbers but in a random sequence Richard Ashbery <basura@invalid.addr.uk> - 2019-06-23 17:14 +0100
                Re: Specific numbers but in a random sequence Richard Ashbery <basura@invalid.addr.uk> - 2019-06-23 14:01 +0100
        Re: Specific numbers but in a random sequence Paul Oates <oatespaul@btinternet.com> - 2019-06-22 17:52 +0100
        Re: Specific numbers but in a random sequence Julian Fry <julianfry@orpheusmail.co.uk> - 2019-06-22 17:56 +0100
        Re: Specific numbers but in a random sequence Julian Fry <JulianFry@compuserve.com> - 2019-06-22 18:05 +0100
  Re: Specific numbers but in a random sequence Sebastian Barthel <naitsabes@freenet.de> - 2019-06-24 07:37 +0000
    Re: Specific numbers but in a random sequence Richard Ashbery <basura@invalid.addr.uk> - 2019-06-24 20:13 +0100

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