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Re: Progress feedback from lsode?


From: Jaroslav Hajek
Subject: Re: Progress feedback from lsode?
Date: Mon, 21 Jul 2008 13:26:03 +0200

On Mon, Jul 21, 2008 at 12:58 PM, Matthias Brennwald
<address@hidden> wrote:
> On Mon, 2008-07-21 at 12:38 +0200, address@hidden wrote:
>> Quoting Matthias Brennwald <address@hidden>:
>> > Ok, that's a good start. But this won't tell me how much longer it will
>> > take to finish the calculation, because I don't know how many iteratios
>> > are needed.
>>
>> True, but is that even possible? I don't know how 'lsode' works, but
>> I'm guessing that
>> the total number of iterations is computed dynamically depending on
>> the specific problem.
>> If that is true, then it'll never be possible to report when the
>> program finishes.
>
> True, too. But maybe it is possible to guestimate of the time remaining.
> I don't know because I am not much into numerical techniques, nor do I
> know much about lsode.
>

Since LSODE is adaptive, the time left depends on what lies ahead.
Generally, a good thing to report would be the finished portion of the
requested interval. If the problem is more or less uniform, this could
also serve as a time estimate.


> Matthias
>
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-- 
RNDr. Jaroslav Hajek
computing expert
Aeronautical Research and Test Institute (VZLU)
Prague, Czech Republic
url: www.highegg.matfyz.cz


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