From: Jacob Sparre Andersen <jacob@jacob-sparre.dk>
Subject: Re: Lotto simulation
Date: Mon, 16 Jun 2014 16:25:51 +0200
Date: 2014-06-16T16:25:51+02:00 [thread overview]
Message-ID: <87oaxtvsls.fsf@adaheads.sparre-andersen.dk> (raw)
In-Reply-To: lnml37$9s2$1@speranza.aioe.org
Markus Schöpflin wrote:
> The easiest way AFAIK is to random shuffle an integer array containing
> the numbers 1 - 49 and then selecting the first six numbers from that
> array.
>
> Random shuffling can be achieved by filling a second array of the same
> size with random numbers obtained from a generator having a uniform
> distribution and then sorting this second array; moving the numbers
> from the first array in lock-step.
Another option could be to fill one array:
type Balls is range 1 .. 49;
type Ordered_List_Of_Balls is array (Balls) of Balls;
Ordered_Balls : Ordered_List_Of_Balls
begin
for Ball in Ordered_Balls'Range loop
Ordered_Balls (Ball) := Ball;
end loop;
Then shuffle the balls in that array:
for Primary in Ordered_Balls'Range loop
Swap (List => Ordered_Balls,
Position_1 => Primary,
Position_2 => Random (Generator));
end loop;
... where I have assumed "sensible" declarations of Swap and Generator.
Greetings,
Jacob
--
Statistics is like a bikini - what it shows is very suggestive,
but the most important stuff is still hidden.
next prev parent reply other threads:[~2014-06-16 14:25 UTC|newest]
Thread overview: 18+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-06-15 17:07 Lotto simulation montgrimpulo
2014-06-15 18:54 ` Stefan.Lucks
2014-06-15 19:53 ` J-P. Rosen
2014-06-16 5:25 ` Stefan.Lucks
2014-06-16 7:49 ` J-P. Rosen
2014-06-16 11:15 ` Stefan.Lucks
2014-06-16 13:40 ` J-P. Rosen
2014-06-16 14:13 ` Natasha Kerensikova
2014-06-16 17:51 ` Randy Brukardt
2014-06-15 19:56 ` Denis McMahon
2014-06-15 20:10 ` Dirk Heinrichs
2014-06-15 20:43 ` Simon Wright
2014-06-16 20:22 ` Dirk Heinrichs
2014-06-15 20:54 ` Simon Wright
2014-06-15 22:09 ` Jeffrey Carter
2014-06-16 11:40 ` Markus Schöpflin
2014-06-16 14:25 ` Jacob Sparre Andersen [this message]
2014-06-16 12:02 ` Dmitry A. Kazakov
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