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I want to add external force to the model. How do I add the xml file that contains the force details to the model when I am using matlab?

analyzeTool.setName(name);
analyzeTool.setResultsDir(results_folder);
analyzeTool.setCoordinatesFileName([ik_results_folder motIKCoordsFile]);
analyzeTool.setInitialTime(initial_time);
analyzeTool.setFinalTime(final_time);

You will load the model (.osim) file. Then you have to add a PrescribedForce (model.addForce()) to the model. Then you provide the model to the AnalysisTool (in the constructor).

https://simtk.org/api_docs/opensim/api_ ... Force.html

Best