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An Interactive Modeling and Simulation Environment for Personal Computers
1 - What Is Easy ModelWorks?
Easy ModelWorks is an interactive modelling and simulation environment for beginners. It is the small sister of ModelWorks (Fischlin 1991 , Fischlin et al. 1994 ) but is much easier to learn. In fact it is based on a full-fledged ModelWorks, but allows only to model either one continuous-time differential equation (DESS) or one discrete-time difference equation (SQM) system specifications at a time.
The system specifications are made in ordinary mathematical notation and can be modified any time. Model parameters, simulation time, integration methos, monitoring (table, graphics) can be controlled easily at run time. You may even click into a state space display and define graphically initial conditions. This allows to explore directly the stability behavior of 2-dimensional systems and to draw easily the phase portrait of such dynamic systems.
Easy ModelWorks models can be saved to disk anytime. There they are stored as simple text files. Easy ModelWorks models can also be written with any word processor or text editor. These text files are written in the so-called EMWSL (Easy ModelWorks Simulation Language). You may anytime translate an Easy ModelWorks model into a ModelWorks MDP (Model Definition Program) if you need the power of the more elaborate bigger sister ModelWorks.
2 - Features
However, some restrictions apply in Easy ModelWorks:
3 - Formal Interface
Easy ModelWorks offers a client (programer's) interface and supports the definition of a custom collection of sample models. To learn about the formal interface, notably all functions see:
4 - Availability
Easy ModelWorks is freeware (courtesy ETH Zurich).
Download it for:
For the latest information not contained in the on-line help of the downloaded software, consult the Easy ModelWorks Read Me: pdf .
5 - Author
Easy ModelWorks has been developped by Andreas Fischlin.
6 - Cited References
Fischlin, A. (1991). Interactive Modeling and Simulation of Environmental Systems on Working Stations. In: Möller, D.P.F. & Richter, O. (eds.), Analysis of dynamic systems in medicine, biology, and ecology. Informatik-Fachberichte 275: 131-145.
Fischlin, A., Gyalistras, D., Roth, O., Ulrich, M., Thöny, J. & Nemecek, T., Bugmann, H. & Thommen, F. (1994). Model Works - an interactive simulation environment for personal computers and workstations. Systems Ecology Report No. 14, ETH Zurich, Switzerland, 324pp.
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