From: tmoran@acm.org
Subject: Re: Discrete random with given distribution ?
Date: Mon, 17 Jun 2002 05:01:36 GMT
Date: 2002-06-17T05:01:36+00:00 [thread overview]
Message-ID: <Q2eP8.468$Gu5.32969772@newssvr14.news.prodigy.com> (raw)
In-Reply-To: 3D0D0D48.B4B3156A@despammed.com
> Hmmm, that's not as clumsy as I thought it would be. :-)
Unfortunately, roundoff complicates it a bit. Consider:
Size = 10
type Discrete_Things is (Apples, Bananas, Cantaloupes, Dates, Eggs);
Probability := (Apples .. Dates => => 0.04, Eggs => 0.84);
Integer( Probability(I) * Size) = 0 for I in Apples .. Dates
which is fine for a one digit accuracy, but
Integer( Probability(I) * Size) = 8 for I = Eggs
leaving Lookup(9 .. 10) undefined. And if you just select
from Lookup(1 .. 8), then Probability of random selection = Eggs is 100%
next prev parent reply other threads:[~2002-06-17 5:01 UTC|newest]
Thread overview: 23+ messages / expand[flat|nested] mbox.gz Atom feed top
2002-06-13 12:10 Discrete random with given distribution ? Reinert Korsnes
2002-06-13 13:35 ` Larry Kilgallen
2002-06-13 12:49 ` Reinert Korsnes
2002-06-13 14:25 ` Wes Groleau
2002-06-13 16:10 ` Kevin Rigotti
2002-06-13 16:33 ` Jeffrey Carter
2002-06-13 22:23 ` Wes Groleau
2002-06-14 8:01 ` Gautier
2002-06-13 18:01 ` tmoran
2002-06-14 7:20 ` Reinert Korsnes
2002-06-14 18:49 ` Wes Groleau
2002-06-14 21:12 ` tmoran
2002-06-16 22:12 ` Wes Groleau
2002-06-17 5:01 ` tmoran [this message]
2002-06-17 16:15 ` Wes Groleau
2002-06-17 18:17 ` tmoran
2002-06-18 19:22 ` Wes Groleau
2002-06-19 0:34 ` tmoran
2002-06-19 0:53 ` tmoran
2002-06-19 5:13 ` Robert I. Eachus
2002-06-14 10:01 ` Gautier
-- strict thread matches above, loose matches on Subject: below --
2002-06-14 22:56 Gautier direct_replies_not_read
2002-06-14 23:10 ` tmoran
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