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.



On Jan 31, 2008, at 11:50 AM, Louis Macovsky wrote:


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

I am not a programmer, so I do not have the answers and perhaps I am not
even posing the right question(s).


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