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Subject: RE: smallTalk programming a binomial function with mean = X?
From: Nicolas Becu (nicolas.becu@gmail.com)
Date: Wed Mar 18 2009 - 18:29:40 CET
Dear Mehdi
Another way is to use an already existing function of the cormas kernel (see
the cormas glossary that you can download on the website).
IN your case it is possible that the following method will help
Cormas normal: X sigma: stDev
(where X is your mean, and stDev is the standard deviation of your
normal distribution)
You can call this method from anywhere, ... just use the keyword 'Cormas'
before (as in Cormas random).
Regards,
Nicolas
-----Message d'origine-----
De : owner-cormas@cirad.cirad.fr [mailto:owner-cormas@cirad.cirad.fr] De la
part de Serge Stinckwich
Envoyé : mercredi 18 mars 2009 16:32
À : vanvlietnathalie@yahoo.com; cormas@cirad.fr
Objet : Re: smallTalk programming a binomial function with mean = X?
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/No virus found in this incoming message. Checked by AVG - www.avg.com Version: 8.0.238 / Virus Database: 270.11.18/2009 - Release Date: 03/18/09 07:17:00