WOLFRAM

Wolfram Language & System Documentation Center

MO (.mo, .moe)

Background & Context

    • Modelica models.
    • File format specified by the Modelica Association.

Import & Export

Import Elements

  • General Import elements:
  • "Elements" list of elements and options available in this file
    "Summary"summary of the file
    "Rules"list of rules for all available elements

Options

  • Import option:
  • "TrustExternalFunctions"Falsewhether to trust external functions in file

Examples

open all close all

Basic Examples  (3)

Import a model:

Wolfram Language code: model = Import["ExampleData/ExampleModel.mo", "MO"]

Examine the model's equations:

Wolfram Language code: model["SystemEquations"]

Simulate the model:

Wolfram Language code: sim = SystemModelSimulate[model, 1]
Wolfram Language code: SystemModelPlot[sim, {"x", "y", "y"'}]

Create a new model:

Wolfram Language code: model = CreateSystemModel[{u[t] == u'[t]}, t];

Save the model, which renames the model to "DiffEq":

Wolfram Language code: file = Export["DiffEq.mo", model, "MO"]

Show the saved file:

Wolfram Language code: FilePrint[file]

Clean up by deleting the new file and models:

Wolfram Language code: DeleteFile[file]; DeleteObject[{model, SystemModel["DiffEq"]}];

Create a new model inside a new package:

Wolfram Language code: model = CreateSystemModel["MyPackage.DiffEq", {u[t] == u'[t]}, t];

Save the package in a directory structure:

Wolfram Language code: targetDirectory = FileNameJoin[{$TemporaryDirectory, "Models"}]; Export[targetDirectory, SystemModel["MyPackage"], "MO"]

The package is saved in a directory "MyPackage", where files mirror the model structure:

Wolfram Language code: FileNames["*.mo", targetDirectory, ∞]

Clean up by deleting the new files and model:

Wolfram Language code: DeleteDirectory[FileNameJoin[{targetDirectory, "MyPackage"}], DeleteContents -> True]; DeleteObject[model];

Import Options  (1)

"TrustExternalFunctions"  (1)

External function evaluation is disabled by default:

Wolfram Language code: modelStr = "package ModelWithExternalFunction function fun input Real x; output Real y; external y = f_ext(x) annotation(Include = \"double f_ext(double x){return cos(x);}\"); end fun; model MyModel Real z = fun(time); end MyModel; end ModelWithExternalFunction;";
Wolfram Language code: model = ImportString[modelStr, "MO"]

The model does not simulate:

Wolfram Language code: SystemModelSimulate["ModelWithExternalFunction.MyModel", 10]

Import with evaluation of external functions enabled:

Wolfram Language code: ImportString[modelStr, "MO", "TrustExternalFunctions" -> True]

Simulate the model and plot the simulation results:

Wolfram Language code: SystemModelPlot["ModelWithExternalFunction.MyModel", "z", 10]

Properties & Relations  (1)

Use "SME" to import SystemModelSimulationData:

Wolfram Language code: sim = Import["ExampleData/OneMass.sme", {"SME", "SystemModelSimulationData"}]
Wolfram Language code: SystemModelPlot[sim]

Possible Issues  (1)

Already-saved models cannot be saved in a different place using Export:

Wolfram Language code: differentFile = "NewFile.mo";
Wolfram Language code: Export[differentFile, SystemModel["DocumentationExamples"], "MO"]

Make a copy of the model to save it in a different location:

Wolfram Language code: newModel = SystemModel["DocumentationExamples", "ModelName" -> "NewExamples"];
Wolfram Language code: Export[differentFile, newModel, "MO"]

Clean up by deleting the new files and model:

Wolfram Language code: DeleteFile[differentFile]; DeleteObject[newModel];