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
