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I am currently using Matlab to calculate changes in muscle lengths during movement by using via points. Is there a way to adapt Opensim's method of using wrap objects in the determination of muscle length to my Matlab model? Ideally, I would like a module that i can input each joint state and receive an output of muscle lengths.

Dear Jesse,

You can do what you want by creating a new type of muscle (a C++ class) and have the methods of this class call your Matlab code. Only problem is that our API is not stable/publically available yet. The good news is that it will be made available later this year.

Sorry for the inconvenience and good luck,
-Ayman