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Subject: Re: smallTalk programming a binomial function with mean = X?
From: Serge Stinckwich (serge.stinckwich@gmail.com)
Date: Wed Mar 18 2009 - 16:31:42 CET
This is quick and dirty method in order to solve your problem.
You have to check it before use it.
1) Create a BinomialDistributionGenerator with 3 instances variables :
n, p and gen
2) Create the following methods :
BinomialDistributionGenerator >>initialize
gen := Random new
BinomialDistributionGenerator >>n: anInteger
n := anInteger
BinomialDistributionGenerator >>p: aProbability
p := aProbability
BinomialDistributionGenerator>>next
| x |
x := 0.
n
timesRepeat: [gen next <= p
ifTrue: [x := x + 1]].
^ x
In order to use it in VisualWorks Smalltalk, you have to add i guess a
new class method (In Squeak, the initialize method is automatically
called) :
BinomialDistributionGenerator class>> new
^super new initialize
3) You can use it like this example :
b := BinomialDistributionGenerator new.
b p: 0.5; n:10.
b next.
On Wed, Mar 18, 2009 at 2:40 PM, Mehdi Saqalli <msqalli@yahoo.com> wrote:
> Hello to All!
> do someone can help us ?
> how to write a binomial function with a mean = X in SmallTAlk?
> thanks in advance
>
>
> ***************************************************
> Mehdi Saqalli
> LMTG - UMR 5563 UR 154 CNRS Université Paul-Sabatier IRD
> Observatoire Midi-Pyrénées - 14, avenue Edouard Belin - 31400 Toulouse,
> France
> fax : +33 (0)5 61 33 25 60 tel.: +33 (0)5 61 33 26 56 / +33 (0)6 16 03 80 37
> courriel: saqalli@lmtg.obs-mip.fr / msqalli@yahoo.com
> web : www.lmtg.obs-mip.fr / www.padniger.net /
> www.enge.ucl.ac.be/staff/past/saqalli.htm
>
-- Serge Stinckwich UMI UMMISCO 209 (IRD/UPMC), Hanoi, Vietnam Smalltalkers do: [:it | All with: Class, (And love: it)] http://doesnotunderstand.org/