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I am attempting to access properties of a specific muscle type through the model tree using the Matlab API interface. However, I am unsure how to go from the Muscle class to the ThelenMuscle2003 class. ie

import org.opensim.modeling.*
modelName = Test.osim;
Model = model(modelName);
MuscleSet = Model.getMuscles();
Muscle1 = MuscleSet.get(0);
activationTimeConstant = Muscle1.getActivationTimeConstant();

When I run the line:
activationTimeConstant = Muscle1.getActivationTimeConstant();
I receive the following error:
No appropriate method, property, or field getActivationTimeConstant for class org.opensim.modeling.Muscle

This makes sense considering the muscle class does not have access to the that function. However, I would like to have access to that function. Is there a way to traverse the model tree to obtain access to that class instance?

Hi Anthony,

You need to downcast to the correct type that has the methods available using the syntax: The result of the call will have the type Thelen2003Muscle and so its full set of methods will be available.

Hope this helps,
-Ayman

I ran into this same problem and the syntax was a bit different than Ayman suggested below, but thank you very much for pointing me in the correct direction.