Re: [Yanl-develop] Developer for numerical routines in C++/boost

[Karsten A. <kar...@gm...>]

Hi,

this is great.

To submit your code you can get an account for the boost sandbox by
writing an email to boo...@li.... Otherwise you can send
us the code and we are integrating it into odeint.

Thank you very much,

Karsten

杨苏立 Yang Su Li wrote:
> Hi，
> 
> I guess I will start by working on DNLS and then move to the couple
> Landau-Stuart oscillator.
> 
> For the implicit Euler, I would try to find some other implementations
> first, and see what I can do from there.
> 
> So how do I submit my codes? Do I get an svn account or something?
> 
> Thank you very much!
> 
> Suli
> 
> 
> 
> 2009/12/13 Karsten Ahnert <kar...@gm...>:
>> Hi,
>>
>> first of all, the source code lives in
>>
>> https://boost.org/svn/boost/sandbox/odeint
>>
>> Some examples already exist in the libs/numeric/odeint/examples. There
>> is also one examples for the Discrete Nonlinear Schroedinger equation
>> (DNLS). In principle you can take this example and implement it the DNLS
>> in terms of their real and imaginary values and compare the performance
>> of both. A basic performance comparison is shown in lorenz_stepper.hpp
>>
>> You can also do the same with coupled Landau-Stuart oscillators, which
>> behave like
>> \dot{A}_k  = ( 1 + i \omega ) A_k - |A_k|^2 A_k + ( c_1 + i c_2 ) (
>> A_{k+1} - 2 A_k + A_{k-1} )
>>
>> Up to now, we have only implemented explict ODE solvers, so we are not
>> very experienced with implicit solvers. So, if you like to implement the
>> implicit Euler (or Backward Euler), i think the best way is to find an
>> existing implementation and try to adapt it to our interface.
>>
>> If you have any question or want to discuss some issues please let us
>> know. Thanks for your help.
>>
>> Best regards,
>>
>> Karsten
>>
>>
>>
>> 杨苏立 Yang Su Li wrote:
>>> Hi,
>>>
>>> I am interested in doing the following:
>>>
>>> * An example of an extended, complex-valued system (like the discrete
>>> Nonlinear Schrödinger equation or coupled Landau-Stuart oscillators),
>>> where the performance of the an implementation in real values is
>>> compared against an implementation in complex values.
>>>
>>> Or
>>>
>>> * the implict Euler method.
>>>
>>> Please give me more details and requirements.
>>>
>>> Thank you very much :)
>>>
>>> Suli
>>>
>>> 2009/12/11 Karsten Ahnert <kar...@gm...>:
>>>> Hi Yang,
>>>>
>>>> the build system is included and works fine.
>>>>
>>>> At the moment we need any of the following:
>>>>
>>>> * an example of an extended two dimensional system (like the complex
>>>> Ginzburg-Landau Equation, the Fermi-Pasta-Ulam system or somethink
>>>> similar) in which the different matrix type are tested and their
>>>> preformance is compared.
>>>>
>>>> * An example of an extended, complex-valued system (like the discrete
>>>> Nonlinear Schrödinger equation or coupled Landau-Stuart oscillators),
>>>> where the performance of the an implementation in real values is
>>>> compared against an implementation in complex values.
>>>>
>>>> * the implict Euler method.
>>>>
>>>> * Integration of the boost unit testing system.
>>>>
>>>> * or you have some other interesting problems which can be used as examples.
>>>>
>>>> Please, let us know what you want to do. Then, we can you more
>>>> informations about the implementation.
>>>>
>>>> Best regards,
>>>>
>>>> Karsten
>>>>
>>>>
>>>>
>>>>
>>>> 杨苏立 Yang Su Li wrote:
>>>>> Hi,
>>>>>
>>>>> I am sorry for the late reply, but last few weeks I was in my vacation
>>>>> and had very poor internet access.
>>>>>
>>>>> I am not very familar with the boost.build system. But I am happy to
>>>>> help testing, writing examples or some implicit methods
>>>>>
>>>>> Please let me know what I can do.
>>>>>
>>>>> Thank you very much.
>>>>>
>>>>> Yang Suli
>>>>>
>>>>>
>>>>>
>>>>> 2009/11/16 Karsten Ahnert <kar...@gm...>:
>>>>>> Hi,
>>>>>>
>>>>>> we discuss everything about yanl our mailing list:
>>>>>>
>>>>>> https://lists.sourceforge.net/lists/listinfo/yanl-develop
>>>>>>
>>>>>> Please register there. At the moment, we are working on the ODE solvers.
>>>>>> The code lives in the boost sandbox
>>>>>>
>>>>>> https://boost.org/svn/boost/sandbox/odeint
>>>>>>
>>>>>>
>>>>>> and we try to become a subpart of the boost libs. We wrote an article
>>>>>> about the design of the solvers, which has been posted on codeproject.
>>>>>> Maybe this is a good introduction for you:
>>>>>>
>>>>>> http://www.codeproject.com/KB/recipes/odeint.aspx
>>>>>>
>>>>>> At the moment we have several open tasks:
>>>>>>
>>>>>> * documentation
>>>>>> * midpoint methods and some implicit methods
>>>>>> * build-system for the examples
>>>>>> * writing examples
>>>>>> * testing
>>>>>>
>>>>>> Please, let us know where you want to contribute to.
>>>>>>
>>>>>> Best regards,
>>>>>>
>>>>>> Karsten
>>>>>>
>>>>>>
>>>>>> Suli Yang wrote:
>>>>>>> Message body follows:
>>>>>>>
>>>>>>> Hi,
>>>>>>>
>>>>>>> I saw your post asking for contribution to yanl.
>>>>>>>
>>>>>>> I am a physics Ph.D student who would like to help. I had
>>>>>>> some experiences in C++ programming in a small group of
>>>>>>> about 5 co-workers. Though I don't know too much about
>>>>>>> numerical computing yet...
>>>>>>>
>>>>>>> Please let me know what I can do.
>>>>>>>
>>>>>>> Suli
>>>>>>>
>>>>>>> --
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>>>>>
>>>
>>>
>>
> 
> 
>