Neil,

meanwhile my experience is the same. But the argumentation (to pass on packages except official ones) is somewhat uncomfortable. One of the great strengths of systems like R is that there is a living community producing libraries with high quality.

And again: Wolfram should anticipate that buyers of WSM want to model queues. This use case is really obvious in the context of modeling software and not beside the point. @Markus: you kindly offered help for questions about SystemDynamics.I will formulate my questions carefully and post them into this discussion.

Best regards Volker

I find it easier to just use the built-in event handling in Modelica. The problem with libraries is that it becomes difficult to understand how something was modeled. For a simple object such as a mass or resistor, it is straightforward. Most of the difficult debugging that I have encountered is when I have relied on someone's library/model and realized that what they did was not consistent with my understanding of the model. Modelica is such a rich language, I suggest that you program your own blocks or use StateGraph blocks if they fit your requirements. In our models, I wound up doing my own blocks (mixed with built-in blocks) because they were simpler and easier to debug and verify. An event is triggered and my block responds to the event.

The built-in Packages are well vetted and are reliable. It is a mistake to add Packages that are publicly available but that you really do not understand -- In my experience you will likely lose more time than you save.

Regards

Hej Markus,

about Deslib: coming from Mathematica I bought WSM 4.2 with the main objective to analyze waiting queues (more complex than the examples for MMA QueueingNetworkProcess, with branches etc.; I needed that for simulating and optimizing waiting queues in airports). This should be a typical application for an environment like WSM. But: no queues, Deslib does not work, no hints, no chance to solve my problems with MMA/WSM (Sorry, this is just my my frustration).

About WSM documentation: I expected a documentation like MMA provides. Definition, Details, Examples (Basic, Scope, Applications, Properties&Relations, Neat Examples). I love MMA.

But when I clicked on WSM Documentation Center > Additional Libraries > SystemDynamics > Overview > Population I got the information: "The System Dynamics methodology is frequently being used for the description of complex interactions between different biological species. This application area, which forms part of the ecological sciences, is usually referred to as population dynamics. This is still one of the most popular application areas of the System Dynamics methodology with thousands of publications describing different aspects of the dynamics of ecosystems."

Surprise, surprise.

In the Class Browser under UsersGuide > Overview > Population (double click) the result is even shorter: "class Population 'Population Dynamics' extends Modelica.Icons.Information; end Population".

This is found when I tried to use an official library of WSM. There is nothing wrong with these sentences but they are not helpful ! I expect a "How to", a "FAQ" etc. I am not guided by this users guide.

There are many good textbooks about MMA but I could not find anything like this for WSM, although there are some books about OpenModelica, e.g. Fritzson et. al. Should I better use OMEdit? Why pay for WSM?

I wanted to stay in the Wolfram Universe but at now I found that Arena or Anylogic do the job much better and OMEdit does for free.

Maybe I am wrong. In this case it would make me very happy if you (or others reading this discussion) could help me with some guiding hints.

Best regards Volker

I have the same requirement.Deslib does not work and the WSM documentation is really poor. I am interested to come in contact with you to discuss this topic. My phone nr is +49 175 4109108. Volker

I think Only Sim Events from Mathworks and MATLAB can help you with this . Is very powerfull