Do you want this only at the beginning (initialization) or you want something like this?

class Gamma 

  parameter Real c = alpha.a + beta.b;

  parameter Alpha alpha; 

  parameter Beta beta; 

end Gamma; 

Thanks Adrpo,

I never knew Modelica could set all to be parameter, good to know.

That way, if I understand correctly, is putting the equation as the default value. I could still get 30 with this, great.

However, If I use following command:
str_cmd := "Gamma.exe -override alpha.a=10,c=30,outputFormat=csv";

I will not be able to get beta.b=20 (by searching the .csv file, there is no "20").

----------------------------------

Actually, I wanted to define Gamma like this: (without any hint about input or output directions for variables)

class Gamma
  Real c;
  Alpha alpha;
  Beta beta;
equation
  c = alpha.a + beta.b;
end Gamma;

Then set it at script if possible at all:

loadFiles({"Alpha.mo", "Beta.mo", "Gamma.mo"});   
buildModel(Gamma, "alpha=parameter, beta=parameter, c=output");
....

----------------------------------
What's your suggestion?

Miles

removed duplicated post

The problem is that we don't put parameters inside the csv as it would have the same value and waste space. We only put parameters inside inside the .mat file.

You can do what you want using scripting and the setComponentProperties API, see https://www.openmodelica.org/download/OMC_API-HowTo.pdf

loadFiles({"Alpha.mo", "Beta.mo", "Gamma.mo"}); getErrorString();

// make c a parameter

setComponentProperties(Gamma, c, {false,false,false,false,false},{"parameter"},{false,false},{""}); getErrorString();

// remove c as parameter

setComponentProperties(Gamma, c, {false,false,false,false,false},{""},{false,false},{""}); getErrorString();

Cheers,
Adrian Pop/

That's exactly what I wanted!
Now I can define Gamma as:

class Gamma
  Real c;
  Alpha alpha;
  Beta beta;
equation
  c = alpha.a + beta.b;
end Gamma;

Then use this script, it just works!!
loadFiles({"Alpha.mo", "Beta.mo", "Gamma.mo"});   

setComponentProperties(Gamma, alpha, {false,false,false,false,false},{"parameter"},{false,false},{""}); getErrorString();
setComponentProperties(Gamma, c, {false,false,false,false,false},{"parameter"},{false,false},{""}); getErrorString();

buildModel(Gamma);
instantiateModel(Gamma);
str_cmd := "Gamma.exe -override alpha.a=10,c=30,outputFormat=csv";
system(str_cmd); getErrorString();

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Bear with me, I have another question: how can I get a single value from the csv/plt file?
For example: In the above example, I've got following result in the .csv file (I believe it is for beta.b)

0,20
0.002,20
0.004,20
...
0.998,20
1,20
1,20

I know it is quite useful to plot with these information. But we all know the result is special: it is 30-10 = 20, it is always 20.

What kind of parameter can I set in the script to give me a single "20" in the file ?

Hello everyone,

I have a model with different electrical components. When I get the output file as csv and I do not filter any variable (variable filter = " .* "), I cannot see the voltage of every single pin of the components in the models. For instance, I see the voltage of the negative pin of my device but not positive pin. Can anybody help me with this?


Best,
Pouya