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
