[SciPy-User] Simulations

David Goldsmith d.l.goldsmith@gmail....
Tue Oct 6 15:06:12 CDT 2009


On Tue, Oct 6, 2009 at 12:23 PM, Cesar Koers <ckoers@telenet.be> wrote:

> Hi Ram,
>
> 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)
>

However, due to what happens to the TD DE model when you transform it to the
FD, don't the DE become AE (algebraic equations) and thus, conceivably, if
equipped with the appropriate machinery under the hood, a "general
simulator" could be designed with an FD "mode."  Clearly Ram's module
doesn't seem to support this dual mode functionality yet, but now that
you've alerted him to this "necessity" for anything he'd want to bill as
"general," he can opt to try to include it (or, simply re-bill what he's got
as a "General Time-Domain Simulation Framework").

DG


>
>
> 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
> >
> >
> > ------------------------------------------------------------------------
> >
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>
> --
> 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
>
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