Archived OpenModelica forums. Posting is disabled.

Alternative forums include GitHub discussions or StackOverflow (make sure to read the Stack Overflow rules; you need to have well-formed questions)


Forgot password? | Forgot username? | Register
Page Start Prev 1 Next End

Best scripting workflow for building and executing models

#7577  Permalink Top

Best scripting workflow for building and executing models

Feb-09-17 17:30:59

Good day.

I am new to OM and would like to know what workflow to follow to build and execute models through scripting.

I use Ubuntu and my workflow in other languages is to code in Vim and then have another tab open in the terminal where I run the script. Is there a similar way in OM?

Lets say I want to run the model given in the tutorial:

Code:


model HelloWorld "A simple equation"

Real x(start=1);

parameter Real a = -1;

equation

der(x)= a*x;

end HelloWorld;



simulate(HelloWorld, stopTime = 2)

plot(x)

Can I put all this code in a file and run the script with some terminal command?

I have tried stuff like

Code:

omc file.oml

and

Code:

omshell file.oml

where the above code is stored in file.oml, to no avail.

Thank you in advance.

Edited by: Dave - Feb-09-17 17:32:29
#7578  Permalink Top

Re: Best scripting workflow for building and executing models

Feb-09-17 18:36:34

See here, session example 3:
https://openmodelica.org/doc/OpenModeli … mmand-line

You can just make a script.mos containing:

Code:


loadModel(Modelica); getErrorString(); // load Modelica if you need it

loadFile("Model.mo"); getErrorString(); // load Model.mo that you edit

simulate(Model); getErrorString(); // simulate the model

plot({x, y}); getErrorString(); // plot any variables you need

then run omc from command line:

Code:


> omc script.mos

#7579  Permalink Top

Re: Best scripting workflow for building and executing models

Feb-09-17 18:39:28

You can also have the model in the .mos:

script.mos:

Code:


// load the model as string, just make sure you escape " with \" inside the string.

loadString("

model HelloWorld \"A simple equation\" 

  Real x(start=1); 

  parameter Real a = -1; 

equation 

  der(x)= a*x; 

end HelloWorld;"); getErrorString();



simulate(HelloWorld, stopTime = 2); getErrorString();

plot(x); getErrorString();

Then run omc from command line:

Code:


> omc +d=showStatement script.mos

Edited by: adrpo - Feb-09-17 18:40:06
#7580  Permalink Top

Re: Best scripting workflow for building and executing models

Feb-09-17 18:48:52

Thank you.

I understand the process, but I am getting the output:

Code:


true

""

true

""

record SimulationResult

    resultFile = "",

    simulationOptions = "startTime = 0.0, stopTime = 1.0, numberOfIntervals = 500, tolerance = 1e-06, method = 'dassl', fileNamePrefix = 'Model', options = '', outputFormat = 'mat', variableFilter = '.*', cflags = '', simflags = ''",

    messages = "Simulation Failed. Model: Model does not exist! Please load it first before simulation.",

    timeFrontend = 0.0,

    timeBackend = 0.0,

    timeSimCode = 0.0,

    timeTemplates = 0.0,

    timeCompile = 0.0,

    timeSimulation = 0.0,

    timeTotal = 0.0

end SimulationResult;

""

false

""

I'm interpreting this as Modelica is loaded successfully (First True) and the file Model.mo is loaded successfully (second True), but the simulation can't be run.

The content of my Model.mo file is:

Code:


model HelloWorld "A simple equation"

Real x(start=1);

parameter Real a = -1;

equation

der(x)= a*x;

end HelloWorld;

Is this correct?

#7581  Permalink Top

Re: Best scripting workflow for building and executing models

Feb-09-17 18:51:50

Never mind, I noticed that simulate(Model) should be simulate(HelloWorld), which I suppose is obvious.

Thanks for your help!

Page Start Prev 1 Next End
Previous topic
Next topic
There are 0 guests and 0 other users also viewing this topic
You are here: