Re: [Yanl-develop] integrate routines

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

Hi all,

I have thought a little bit about this topic_

1 .it would be nice to have functions integrate, like

integrate( stepper , system , dt , start_time , start_state , steps )

which in-place integrate the start state

2. Functions, like

integrate_and_fill( stepper , system , dt , start_time , start_state ,
container )
integrate_and_fill( stepper , system , dt , start_time , start_state ,
start_iter , end_iter )

which fill one container with a "time series", (the container version
only calls the iterator version),

3 . A version with

integrate_and_insert( stepper , system , dt , start_time , start_state ,
steps , inserter )

which insert the time series into a (mayby empty) container. The
inserter is the most general syntax for doing so, but we can also write
some other wrappers for this function.


I think every funtion is only a two (or three) liner, so there is no
much overhead and we have a function for nearly all applications.

And of course, we have to introduce some kind of observer concept.

Best regards,

Karsten






Mario Mulansky wrote:
> Hi all,
> 
>> void integrate( stepper , system , dt , start_time , start_state ,
>> 	end_time , inserter );
>> void integrate( stepper , system , dt , start_time , start_state ,
>> 	num_of_steps , inserter );
>> void integrate( stepper , system , dt , start_time , start_state ,
>> 	start_iter , end_inter );
>> void integrate( stepper , system , dt , start_time , start_state ,
>> 	state_container );
> 
> I don't exactly understand why we need inserter, start/end_iter and 
> state_container. All our routines are in-place and work on start_state. If 
> the user doesn't want his start state overwritten he should copy it himslef 
> before. I also think one method with number_of_steps is sufficient. For 
> constant dt the relation to t is obvious and can be left to the user.
> 
> Regards, Mario
> 
>> Maybe one gets into troubles with the first two versions, since end_time
>> can easily by casted in num_of_steps. For the inserter one needs the
>> InsertIterator requirement[1] and the stepper needs the next_step
>> function without error estimation.
>>
>> Best regards,
>>
>> Karsten
>>
>>
>> [1] http://www.sgi.com/tech/stl/insert_iterator.html
>>
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