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 >>> >>> >>> _______________________________________________ >>> 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 > > _______________________________________________ > Kepler-users mailing list > Kepler-users at ecoinformatics.org > http://mercury.nceas.ucsb.edu/ecoinformatics/mailman/listinfo/kepler-users -- ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ Matthew B. Jones Director of Informatics Research and Development National Center for Ecological Analysis and Synthesis (NCEAS) UC Santa Barbara jones at nceas.ucsb.edu Ph: 1-907-523-1960 http://www.nceas.ucsb.edu/ecoinfo ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
