[Scilab-Dev] Incomplete Gamma function

[Michaël Baudin]

Hi,

Numerical Recipes are providing excellent algorithms indeed.
Unfortunately, they are copyrighted material, and so cannot
be included directly in Scilab.

Did you consider the gammainc function from Stixbox :

http://forge.scilab.org/index.php/p/stixbox/source/tree/master/macros/gammainc.sci

Is this function numerically accurate ?
(Some other functions are not, e.g. the hypergeometric distribution).
What is obvious is that some update should be made
so that the matlab emulation functions (mtlb*) are
avoided.

Best regards,

Michaël

OLIVIER Mathieu a écrit :
> Bonjour,
>
> I'm currently working in another ATOMS modules (meteorological module 
> and xml parser (but in scilab)), so I will not have a lot of time to 
> work in another ATOMS module.
>
> So, if this function could help (I think so, that's why I send it), I 
> give it to you and hope I will find it in a next update of Scilab.
>
> Nevertheless, if you need some developments from me, just let me know 
> and I will do my best.
>
> Regards,
>
> Mathieu
>
>
>
>
>
> On 29/07/2010 16:06, Sylvestre Ledru wrote:
>> Bonjour Mathieu,
>>
>> Le jeudi 29 juillet 2010 à 01:37 +0200, OLIVIER Mathieu a écrit :
>>> Hi,
>>>
>>> I needed the Incomplete Gamma function, as it was not available in
>>> Scilab, I've developed my own one, based onto the NUMERICAL RECIPES.
>>>
>>> This functions works and gives sames results than the one from MATLAB
>>> (with my own tests).
>>>
>>> So I would like to submit this function, perhaps this one could be 
>>> added
>>> in a future version of Scilab or help to made a "Scilab version".
>> We could indeed improve the current gamma function of Scilab with your
>> work.
>> However, to achieve the quality level expected, some developments would
>> be required. I am thinking about unitary tests, documentations and some
>> updates in the code (localization, normalisation of the messages, etc).
>>
>> If you are interested, we could work together on this.
>> (anyway, you have still the possibility to create an ATOMS module for
>> this)
>>
>> Sylvestre
>>
>>
>>


-- 
Michaël Baudin
Ingénieur de développement
michael.baudin at scilab.org
-------------------------
Consortium Scilab - Digiteo
Domaine de Voluceau - Rocquencourt
B.P. 105 - 78153 Le Chesnay Cedex
Tel. : 01 39 63 56 87 - Fax : 01 39 63 55 94