Hi Vahid, You can optimize spring stiffness and rest length using MocoParameters. To get started, check out the cheat sheet on the "User Guide" page of our documentation (https://opensim-org.github.io/opensim-moco-site/docs/). We have two solvers in Moco: MocoTropterSolver and MocoCasADiSolver. When...

Hi Iris, Part of your issue is that you need to print out the model created by the ModelProcessor so that it's compatible with your states and controls file. For example, you've added reserves to the model that the base model doesn't have and you've disabled tendon compliance but the base model hasn...

Iris, Based on your error message, WARNING: Umberger2010MuscleMetabolicsProbe_MetabolicMuscleParameter: Muscle 'muscle name' not found in model. Ignoring...) it looks like you need to provide the muscle names for each metabolic muscle parameter. Double check your model file to make sure they all hav...

Hi Karthick, To compute muscle moments, you'll need to compute muscle moment arms. Moment arms are not available as an output since you need to provide the state AND which coordinate you want the moment arm about: coordSet = model.getCoordinateSet(); coord = coordSet.get('<desired_coord_name>'); mus...

Ross, The DeGrooteFregly2016 muscle derives from OpenSim's base Muscle class, so you can use all the outputs available to that class. You can get fiber velocity (or normalized fiber velocity) by adding the output paths like so: outputPaths = StdVectorString() outputPaths.add('/forceset/soleus_r\|fib...

Hi everyone, There is an alternative utility we built into Moco that might be more convenient than using the OpenSim AnalyzeTool. There is a method called analyze() built into Moco study that accepts a MocoTrajectory and a vector of strings to model outputs and returns a TimeSeriesTable of those out...

Hi Ross,

The setFramePaths() methods accepts a vector of strings, so in MATLAB you have to do this: Let me know if that works.

Best,
-Nick

Hi Ross, Thanks for the sending the attachments -- I think I've found the issue. This goal accepts reference tables that are type TimeSeriesTable_<SimTK::Rotation>. That means each "column" of the table contains rows of values of type SimTK::Rotation (not just a scalar value). I realize now that the...

Hi Ross, I think you need to reorder the commands so you add the goal to the problem after you set the reference file. torsoGoal = MocoOrientationTrackingGoal('torsoGoal',weight); torsoGoal.setRotationReferenceFile('torso_orientation.csv') problem.addGoal(torsoGoal); Let me know if that doesn't work...

Hi Mritula,

Apologies, that sentence should have been "You might be better off tracking coordinates computed from InverseKinematics in MocoTrack...".

Hope that's clear.
-Nick