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From Gilles <gil...@harfang.homelinux.org>
Subject Re: [MATH] Ordinary differential equations - stiff solver
Date Sat, 23 Apr 2016 09:32:53 GMT
Hi.

There is also a long-pending issue on that subject:
   https://issues.apache.org/jira/browse/MATH-172

Regards,
Gilles


On Thu, 21 Apr 2016 02:55:42 +0200, Gilles wrote:
> Hi.
>
> On Fri, 15 Apr 2016 21:41:32 -0400, Stefan Hubert wrote:
>> Hello Gilles,
>>
>> the Java code I have from LSODA is from a C-Code translation, which 
>> was at
>> MIT license.
>>
>> I would definitely offer the LSODA Java code I already have, to get 
>> things
>> started. Is anyone else interested in starting this project? How can 
>> we
>> start it?
>
> You could post a proposal on the "dev" ML.
> But you should be ready to make most of the adaptation work; Commons 
> Math
> is a project that needs contributors... :-}
>
>> Best,
>> Stefan
>>
>>
>>
>> On Fri, Apr 15, 2016 at 9:00 AM, Gilles 
>> <gilles@harfang.homelinux.org>
>> wrote:
>>
>>> Hello.
>>>
>>> On Fri, 15 Apr 2016 08:30:39 -0400, Stefan Hubert wrote:
>>>
>>>> Hi everybody!
>>>>
>>>> I am curious if a support for solving stiff ordinary differential
>>>> equations
>>>> is planned in future?
>>>>
>>>> There are a lot of them available for Fortran 77 (e. g.
>>>> 
>>>> https://people.sc.fsu.edu/~jburkardt/f77_src/odepack/odepack.html). 
>>>> I do
>>>> have a direct Java translation
>>>>
>>>
>>> We should be wary of direct translations, as they are no more
>>> understandable
>>> than the original source.
>>> Commons Math, being implemented in _pure_ Java, should be an
>>> object-oriented
>>> library.
>>>
>>> of LSODE,
>>>>
>>>
>>> Unless I'm mistaken, there is no license.
>>>
>>> maybe this helps to get started?
>>>>
>>>
>>> Yes, if you are willing to use it as a reference implementation of 
>>> a new,
>>> independent, free, object-oriented version of the functionality.
>>>
>>> Best regards,
>>> Gilles
>>>
>>>
>>>> Best,
>>>> Stefan
>>>>


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