Hi Maria, I see. Yes, unfortunately we do not have a method similar to addNewPathPoint for MovingPathPoints in Muscle. However, since you've already constructed the MovingPathPoint yourself, you should be able to add it to the model by updating the muscle path's PathPointSet : pathPointSet = Latissi...

Hi Maria,

If you could provide a minimum working example that reproduces the errors that you are encountering, along with the error messages, then we can assist with debugging your issue.

Best,
Nick

Hi Sakamo,

That error usually occurs when the optimizer struggles with the problem initial guess. Are you using the default initial guess or providing your own? Some general details about your problem would be helpful too.

Best,
Nick

Hi Adam, Yes, you would likely need to add a foot-ground contact force element to your model to model the effects of the shoe/sole stiffness. You will probably need to use MocoTrack or a custom MocoStudy though, since your input kinematics will probably not produce correct forces at the feet "out-of...

Hi Neha, I am not sure what you mean by this. If you problem converged and the controls are at the middle of the control bounds, then it probably converged to a local minima. There are many factors that might explain this: cost functions terms (and their weights), model complexity, choice of initial...

Hi Cedric,

OpenSim (and Moco) uses SI units: meters, radians, Newtons, etc. Speed is measured in meters per second (m/s).

Best,
Nick

Hi Park, You will be able to calculate forces that way, but I don't think the forces from a foot-ground contact model computed directly with IK kinematics will be very accurate. The IK solution will not capture the fine kinematic between the foot and the ground that are important for good force esti...

Hi Ana,

If you're looking for the Ipopt output, you can add an ipopt.opt (Ipopt options) file to your working directory to specify where the Ipopt output should be directed to.

I haven't found a more general solution for this, but will let you know if I do!

Best,
Nick

Hi Neha, Your problem appears to be infeasible (i.e., the problem cannot enforce the dynamics constraints in the direct collocation problem). I'm not sure about the MUMPS memory issue, but it might be related to Ipopt entering "restoration mode" in order to address the infeasibility issue. I would r...

Hi Brodie, MocoTrack is just a tool for configuring a MocoStudy for tracking optimization problems. You can access the internally configured MocoStudy using "initialize": track = MocoTrack(); % your tracking problem configuration study = track.initialize(); solution = study.solve(); outputPaths = St...