[kepler-users] System Dynamics Actor?

[Edward A. Lee]

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
>>
>>
>>_______________________________________________
>>Kepler-users mailing list
>>Kepler-users at ecoinformatics.org
>>http://mercury.nceas.ucsb.edu/ecoinformatics/mailman/listinfo/ kepler-users
>
>
>----------------------------------------------------------------------------
>Posted to the ptolemy-hackers mailing list.  Please send administrative
>mail for this list to: ptolemy-hackers-request at ptolemy.eecs.berkeley.edu
>

------------ 
Edward A. Lee
Chair of EECS and Robert S. Pepper Distinguished Professor
231 Cory Hall, UC Berkeley, Berkeley, CA 94720-1770
phone: 510-642-0253, fax: 510-642-2845
eal at eecs.Berkeley.EDU, http://www.eecs.berkeley.edu/Faculty/Homepages/lee.html