Sorry, I should have been clearer. I was actually looking for a line higher up. Maybe you could just paste all of the optimizer output? I tried to reduce the convergence and constraint tolerance to 10e-2 and then 10e-1, the mesh interval to 10 and the maximum iterations number to 2000 but it failed ...

This error might mean that your constraints can't be satisfied. For example, maybe the muscles are not strong enough.

Sometimes, however, we get this error for reasons we have not yet understood. Could you share the last few lines of output describing the iterations of IPOPT?

Thanks for those details. I have created my own trc file indicating the position of the input bar at different instants of time (setting a constant angular velocity for the crank) and I want to obtain the velocity and acceleration position of the rest of the bars to check if I get the correct result...

Dani, I'm curious: could you describe why you want to use MocoInverse (prescribing a given motion) rather than MocoStudy (predicting a new motion)? If you provided the motion, you may already know the accelerations. Where is the input motion from? You could do a prescribed-motion forward simulation ...

I would use ContactSpheres on the feet and a ContactHalfSpace for the ground. See this paper for an example of using OpenSim's Hunt-Crossley Force to model foot-ground contact: https://journals.plos.org/plosone/artic ... ne.0217730

Carlos,

It's great to hear you got example2DWalking working in Python. Also, thank you for helping out on the forum. Would you be interested in contributing this back to the project? No pressure.

-Chris

Yes, I think so.
We are in the process of merging Moco into the `opensim-core` repository. We may delay the next release until that merging process is complete.

Karthick, you make a good point. There is currently no easy way to "clip"/"rectify" an output. Antoine Falisse contributed a metabolics model that can be used as a goal. It's not in an official release of Moco, but you should be able to try it out with this build (you might need to be logged into Gi...

Are you able to use Moco 0.4.0? Please let us know if you continue to run into issues.

Note that we may still make small changes to Moco's interface in the coming months.

Karthick,

If coming by such data proves difficult, you can perform a sensitivity analysis to assess how much the fiber ratio affects your final results. It's possible that the fiber ratio has a small effect on your results.