Hello Ankit, or Sergio, I've completed Quiz1 and Quiz2. Was there anything else I needed to complete to finish the study group assignments ? Thanks for the Introduction to System Modeler. John Burgers.

Yes, you are correct. The right answer is 1.7 mol/l. I will fix it tomorrow.

Dear Ankit,

Why if I carry out the following simulation command doesn't work

In[5]:= SystemModelPlot["WSMExercises.Ex3.MyModels.ElectricKettle"]

it complains with: "SystemModelPlot::nov: A list of variables to plot is required." But the simulation is correct because

In[8]:= SystemModelPlot["WSMExercises.Ex3.MyModels.ElectricKettle", "water.T"]

returns the correct plot. Even thought if I execute the solutions example

In[9]:= SystemModelPlot["WSMExercises.Ex3.Solutions.ElectricKettle"]

it is not mandatory to say "water.T" variable I don't understand why. Thanks for any clue. Regards,

Apology for so many questions from me, perhaps one of the few newbies on the topic. Also was too busy to attend the thermal modellng session.

My question, the assignment asks to change the walls with "Ventilation" components. But I don't find such a component in "College thermal" nor by query of the packages which i've so far installed, Modellica, Modellica services, ModelPlug, Complex

Thanks for any tips.

Can you help me understand In[23] failed? I tried both with and with out system model GUI launched, with the same result.

In[23]:= CreateSystemModel["WSMExercises.Ex7.MyModels.Wingnut", wingnut];

In[24]:= SystemModel["WSMExercises.Ex7.MyModels.Wingnut", "ModelicaDisplay"]

During evaluation of In[24]:= SystemModel::nomod: The model WSMExercises.Ex7.MyModels.Wingnut was not found.

Out[24]= SystemModel["WSMExercises.Ex7.MyModels.Wingnut", "ModelicaDisplay"]

This particular CreateSystemModel problem may be independent of the issue with the link to System Modeler. @John Burgers could you close all your wolfram applications, open Mathematica and run the following:

SystemModelSimulate["IntroductoryExamples.HelloWorld"]

Looking at the output might give us some information on whether there is a deeper issue with your setup not allowing us to run the executables that correspond to a built model. Then, can you run

CreateSystemModel["MyBall", Ball[]]

Does this return the unevaluated CreateSystemModel function call or does it return a SystemModel? My suspicion is that in your wingnut call, the symbol wingnut was somehow not set to the corresponding shape and the model was not created at all. So if this works, then it would be worth checking the wingnut shape was used properly in the original question. If this does return a SystemModel then could you try

SystemModel["MyBall","ModelicaDisplay"]

Conventionally, if the model exists, this should return a display, regardless of whether your link to System Modeler is working or not. Let us know how this goes.

Then the most probable reason is that the model "Inerter" does not exist in the MyModels package of WSMExercises. This exercise is dependant on the notebook titled, "4. Create components using text (inerter)", where we create the inerter model and save it in the MyModels package of Exercise 5. Try running this instead:

SystemModeler["WSMExercises.Ex5.MyModels.Inerter"]

Should this command open a System Modeler (GUI) session?

SystemModeler[{"WSMExercises.Ex6.MyModels.Inerter"}]

SystemModeler::ncor: SystemModeler is a full graphical modeling and simulation environment available in the Wolfram SystemModeler product.

Confirm using 12.2 .

Successful exectution of :

Needs["PacletManager`"]; 
PacletDirectoryLoad[  "C:\\Program Files\\Wolfram Research\\SystemModeler 12.2\\Mathematica\\"];
RebuildPacletData[]

Not successful with SystemModeler[{"WSMExercises.Ex6.MyModels.Inerter"}]

Tried PackletFind["SystemModeler"] without success.

Not clear to me what this means ...

Drag and drop the new Car dynamics graphic over the old one. The F1 car has changed its behavior.

Help > Documentation Center > Simulation Center - Plot Windows had nothing to say about this.

Help?

Maybe that sentence is better understood after watching you in the lesson, which my good fortune didn't permit in these dreadfully busy times. Achieved the same graph as in the notebook by dragging "car dynamics" from the plot area of the "pinned" simulation ... onto the car dynamics graph created from the simulation with the inerter. Which seems different than the wording in the notebook.

Ex 4 Pendulum. Not sure what you mean by "Add this as a model plot, calling it Pendulum angle." Does that mean Wolfram system Modeler Simulation Center > Plot > Add Plot to Model ... ?

Ex 4 Pendulum. Y(x) plot of pendulum.r[1], pendulum.r[2] results in horizontal line pendulum.r[2]=0 for range -222e-18< pendulum.r[1]<+222e-18. Is there an instruction in the training I missed?

Thanks, Was watching you in today's review session, I must have missed it. Model looks exactly like the exercise sheet 3. "Create components and animations Exercise 4 Pendulum" On simulation the animation shows a swinging pendulum Y[x] plot show nothing. time plot shows r2[t]=1 constant r1[t]=0 constant. What might be wrong?

The "Component Properties" pop up window runs the height of my screen and beyond the screen bottom. Attempt to resize the window fail with the pop up disappearing resulting in system modeler "Model Center" lock up. The only solution I can find is a Task Manager stop process. Any suggestions?

system modeler 12.2 build 9 OS Win 10.0 Thanks

Hi Ulf, In these cases a good source of information is the library documentation. Check the documentation in Modelica.Mechanics.Translational.UsersGuide. Specifically, I can here point you to the online versions of the documentation, such as

https://reference.wolfram.com/system-modeler/libraries/Modelica/Modelica.Mechanics.Translational.UsersGuide.Overview.html

where you find

By convention in this library, the connector characterized as a filled green square is called flangea and placed at the left side of the component in the "design view" and the connector characterized as a non-filled green square is called flangeb and placed at the right side of the component in the "design view". The two connectors are completely identical, with the only exception that the graphical layout is a little bit different in order to distinguish them for easier access of the connector variables.

and in

https://reference.wolfram.com/system-modeler/libraries/Modelica/Modelica.Mechanics.Translational.UsersGuide.SignConventions.html

where you find information of the purpose of the arrow, which is basically to provide some help in establishing the signs of vector quantities and its relation to the physical system in which they are implemented.

Hi Ankit, Can you provide a quick guide to obtaining and installing the requisite C++ compiler? What was on the Mathematica site wasn't easy enough for me. I'm not at all familiar with that. I presume it is free? Thank-you.

We are excited to host this!

If you are new to System Modeler or an experienced user (and want a refresher), then this study group is relevant for you.

I will be joined by my colleagues @Leonardo Laguna Ruiz and @Sergio Vargas.