[SciPy-User] Simulations

David Goldsmith d.l.goldsmith@gmail....
Thu Oct 8 16:15:15 CDT 2009


Probably wise, but then Cesar's comment about being careful about what you
advertise applies.

DG

On Thu, Oct 8, 2009 at 12:34 AM, cool-RR <cool-rr@cool-rr.com> wrote:

> Hey Cesar and David,
> I thought about this and I think I better stick to the "Do one thing well"
> principle for now. Thanks for the insight though.
>
> Ram.
>
>
> On Tue, Oct 6, 2009 at 9:23 PM, Cesar Koers <ckoers@telenet.be> wrote:
>
>> Hi Ram,
>>
>>
>> A specific type of time domain solver for electromagnetics is e.g. TDFD
>> = time domain finite difference. It is based on discretizing Maxwell
>> equations in time & space
>>
>> But the Maxwell equations can also be expressed in the frequency domain
>> (thus for every frequency instead of every time instant). This leads to
>> FDFD = frequency domain finite difference.
>>
>> Other kinds of models, like based on finite elements (FE) can also be
>> developed in the frequency domain.
>>
>> Perhaps you're now thinking that your 'step function' would still work
>> in the frequency domain (response at frequency f_{i+} as a function of
>> response at frequency f_i), but this doesn't work (to my knowledge)
>> because it requires that the system is modeled by differential equations
>> in the frequency domain (haven't encountered this before)
>>
>>
>> Ah and some other 'bureaucracy' features:
>> * tracking time spent / calculating time remaining till end
>> * refining/coarsening time step to improve accuracy/reduce simulation
>> time respectively
>>
>> best regards
>>
>> C
>>
>>
>> cool-RR wrote:
>> > Hey Cesar,
>> >
>> > Your comments are interesting.
>> >
>> > Can you explain to me a bit about frequency domain simulations? Can you
>> > give an example of a simulation simulating a real world process?
>> >
>> > I agree that GarlicSim must handle the bureaucracy well, as its job is
>> > to let the user write a simulation with as little bureaucracy as
>> possible.
>> >
>> > P.S. I registered garlicsim.org <http://garlicsim.org> and it is now
>> the
>> > main domain.
>> >
>> > Ram.
>> >
>> > On Mon, Oct 5, 2009 at 9:11 PM, Cesar Koers <ckoers@telenet.be
>> > <mailto:ckoers@telenet.be>> wrote:
>> >
>> >     Hi Ram,
>> >
>> >
>> >     I quickly read through your intro doc, I think you've explained your
>> >     idea quite well.
>> >
>> >     One remarks though: I think your framework would fit well to
>> time-domain
>> >     (transient) models. But at this moment I don't see how you could
>> cast a
>> >     frequency domain simulation (commonly used in EM solvers) in it. I'd
>> be
>> >     careful with the idea that 'all simulations' fit into this.
>> >
>> >     What I think is key to success of this kind of framework is how well
>> it
>> >     handles the 'bureaucracy' of performing simulations (and speed, but
>> >     you've already mentioned that the actual number crunching is up to
>> the
>> >     user of the GarlicSim). With this, I mean the boring stuff, like
>> e.g.:
>> >
>> >     * keeping track of which parameters vary between simulations
>> >     * extracting data from a set of simulations as a function of one of
>> >     these parameters
>> >     * storing (and backing up) simulation results without taking up too
>> much
>> >     space and needing to invent unique and descriptive file names
>> >     * being able to redo a simulation (storing simulation parameters
>> with
>> >     results)
>> >     * making simulation reports
>> >     * comparing results with real-world data
>> >     * for long simulations, being able to continue simulation after a
>> crash
>> >
>> >     Just my 2 cents
>> >
>> >     Best regards
>> >
>> >     C
>> >
>> >
>> >     cool-RR wrote:
>> >      > Hello,
>> >      >
>> >      > This is not directly related to SciPy; I'm posting it here
>> because I
>> >      > figure that there may be people here who know the scientific
>> >     computing
>> >      > world enough to help me with my question.
>> >      >
>> >      > I've been working on an open-source scientific computing project
>> for
>> >      > about 6 months now, and I've come to the conclusion that it's
>> >     about time
>> >      > to find other users except myself for it, so I may get valuable
>> >     feedback
>> >      > about which direction I should be taking this project.
>> >      >
>> >      > The project is called GarlicSim (http://garlicsim.com
>> >      > <http://garlicsim.com/>). It's a Pythonic platform for working
>> with
>> >      > simulations. You may read more about it on the webpage. In short,
>> >     it's a
>> >      > very general framework for creating, running and analyzing
>> >     simulations.
>> >      > It's not specific to any scientific field; Its role is to provide
>> a
>> >      > general mold into which all simulations can be cast. If you want
>> >     to know
>> >      > more about it you can also read a (yet-incomplete) introduction
>> >      >
>> >     <
>> http://dl.getdropbox.com/u/1927707/Introduction%20to%20GarlicSim.doc>
>> >     to
>> >      > it.
>> >      >
>> >      > So what I want to know is, who would be good potential first
>> >     users for
>> >      > this, and how could I reach them?
>> >      > I'm not even sure which scientific field I would like to target,
>> so
>> >      > please suggest.
>> >      >
>> >      >
>> >      > Thanks,
>> >      > Ram Rachum
>> >      >
>> >      >
>> >      >
>> >
>> ------------------------------------------------------------------------
>> >      >
>> >      > _______________________________________________
>> >      > SciPy-User mailing list
>> >      > SciPy-User@scipy.org <mailto:SciPy-User@scipy.org>
>> >      > http://mail.scipy.org/mailman/listinfo/scipy-user
>> >
>> >     --
>> >     Gaetan Cesar Koers
>> >     Kerkveldweg 82
>> >     1851 Humbeek
>> >     +32(0)486 20 11 16
>> >     _______________________________________________
>> >     SciPy-User mailing list
>> >     SciPy-User@scipy.org <mailto:SciPy-User@scipy.org>
>> >     http://mail.scipy.org/mailman/listinfo/scipy-user
>> >
>> >
>> >
>> >
>> > --
>> > Sincerely,
>> > Ram Rachum
>> >
>> >
>> > ------------------------------------------------------------------------
>> >
>> > _______________________________________________
>> > SciPy-User mailing list
>> > SciPy-User@scipy.org
>> > http://mail.scipy.org/mailman/listinfo/scipy-user
>>
>> --
>> Gaetan Cesar Koers
>> Kerkveldweg 82
>> 1851 Humbeek
>> +32(0)486 20 11 16
>> _______________________________________________
>> SciPy-User mailing list
>> SciPy-User@scipy.org
>> http://mail.scipy.org/mailman/listinfo/scipy-user
>>
>
>
>
> --
> Sincerely,
> Ram Rachum
>
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>
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