I think ecologists would use that sort of thing a lot. They like stella
for its simplicity as a model prototyping tool, even when they end up
implementing the models for their final runs in a different system.
I've even seen Stella used as a front end in the Spatial Modeling
Environment (SME) for building stock-flow models that are then run
through a code-generator to produce executables that are run on high-end
parallel supercomputers (see [1]). We don't have the resources right
now to tackle this project, but I think it would indeed be valuable.
Matt
[1] http://www.uvm.edu/giee/SME3/
Edward A. Lee wrote:
It does sound like it would be an interesting project to build
some Stocks and Flows actors, a-la Stella... The underlying ODE
solver of the CT or Continuous domains would be leveraged...
Anyone interested in doing that?
Edward
At 02:06 PM 1/31/2008, Timothy McPhillips wrote:
Hi Louis,
As Edward mentioned, the continuous time domain can be used to model
dynamic systems of the sort I think you are talking about. However,
these models aren't quite as easy to build or understand as STELLA
models, say. A few years ago I spent a few days trying to emulate
STELLA's capabilities (i.e, modeling dynamic systems in terms of
stocks and flows) in Kepler, but the results weren't as clean as
STELLA models for a number of reasons, most especially because the
stocks and flows were not distinct actors. I, too, would like to see
such support in Kepler, along with capabilities for easily running
these models multiple times in a parameter sweep or search,
summarizing the results of multiple runs of the model, etc.
Cheers,
Tim
On Jan 31, 2008, at 11:50 AM, Louis Macovsky wrote:
Hi,
Is there any work being done to add a system dynamics Actor?
I have raised this question about 1.5 yrs ago but I am still hoping
to hear
that it is someone's project using for example BerkeleyMadonna
http://www.berkeleymadonna.com/ and maybe the more suitable
JMadonna which
is in development. I point out JMadonna because I "assume" that its
development would be accessible to Ptolemy and Keppler developers.
There is an open source SD application that is a relatively new
addition to
NetLogo. Could it be a candidate around which an Actor could be
developed?
In addition to BerkeleyMadonna, I use STELLA http:// www.iseesystems.com/ and
Vensim http://www.vensim.com/ . I have not used Simile
http://simulistics.com/ but for a commercial SD package it may be a
candidate to work around. There are other SD programs but I have
not used
them.
I am not a programmer, so I do not have the answers and perhaps I
am not
even posing the right question(s).
Thanks,
Louis
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Edward A. Lee
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231 Cory Hall, UC Berkeley, Berkeley, CA 94720-1770
phone: 510-642-0253, fax: 510-642-2845
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Matthew B. Jones
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National Center for Ecological Analysis and Synthesis (NCEAS)
UC Santa Barbara
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