Search found 52 matches

by Matthew Lee
Tue Mar 12, 2024 4:56 am
Forum: OpenSim Moco
Topic: Contact force oscillations/parameter tuning
Replies: 22
Views: 3851

Re: Contact force oscillations/parameter tuning

Hi Pasha,

Sorry to reopen this old topic. Could you give me some suggestions on how you finally solved the problem of oscillation and spikes occured in vertical ground reaction force ?

Best Wishes,
Matthew
by Matthew Lee
Thu Feb 29, 2024 12:12 am
Forum: OpenSim Moco
Topic: Some questions about how to create and use some customed plugins in Moco
Replies: 5
Views: 875

Re: Some questions about how to create and use some customed plugins in Moco

Hi Nick, Thanks very much for your quick reply! Related to the above two questions, I still need your help: 1. If I don't customize a new objective function. In other words, I am only using the objective function provided by Moco, such as the most common MocoControlGoal , to minimize the control squ...
by Matthew Lee
Wed Feb 28, 2024 6:27 pm
Forum: OpenSim Moco
Topic: Some questions about how to create and use some customed plugins in Moco
Replies: 5
Views: 875

Re: Some questions about how to create and use some customed plugins in Moco

For an example on how to create a plug-in in Moco, you can review the following example: https://github.com/opensim-org/opensim-core/tree/main/OpenSim/Examples/Moco/exampleMocoCustomEffortGoal. Hi Nick, Thanks very much for your professional answer! I can successfully run the example you mentioned,...
by Matthew Lee
Sun Feb 25, 2024 6:40 am
Forum: OpenSim Moco
Topic: Some questions about how to create and use some customed plugins in Moco
Replies: 5
Views: 875

Some questions about how to create and use some customed plugins in Moco

Dear Moco development team and Moco users, Thank you all for your contributions to the biomechanics community! I want to use some customed plugins in Moco to achieve personalized needs, but I got stuck in how to implement it through programming, I would appreciate it if anyone could give me some adv...
by Matthew Lee
Thu Nov 30, 2023 4:30 pm
Forum: OpenSim Moco
Topic: Unexpected interruption of optimization iterations
Replies: 5
Views: 414

Re: Unexpected interruption of optimization iterations

What is the magnitude of the objective value? Dear Nick, Thanks very much for your quick reply! The objective function value is around 0.7, which is within [0.1,10]. My convergence tolerance is set to 1e-3. The final iterations are as follows: iteration.JPG I look forward to getting more guidance f...
by Matthew Lee
Thu Nov 30, 2023 9:02 am
Forum: OpenSim Moco
Topic: Unexpected interruption of optimization iterations
Replies: 5
Views: 414

Unexpected interruption of optimization iterations

Dear Moco development team and Moco users, Thank you all for your contributions to the biomechanics community! I recently ran into a problem with optimization iterations unexpectedly interrupted when doing a muscle-driven predictive simulation . The specific interruption prompt output by IPOPT is 'R...
by Matthew Lee
Sat Jul 01, 2023 12:36 am
Forum: OpenSim
Topic: How to select the parameters of the contact spheres?
Replies: 0
Views: 211

How to select the parameters of the contact spheres?

Dear Opensim development team and Opensim users, Thank you all for your contributions to the biomechanics community! I have some issues regarding the parameter selection of contact sphere , I would appreciate it if anyone could give me some advice. Contact spheres are usually used to simulate foot-g...
by Matthew Lee
Sat Jul 01, 2023 12:34 am
Forum: OpenSim Moco
Topic: How to select the parameters of the contact spheres?
Replies: 0
Views: 202

How to select the parameters of the contact spheres?

Dear Moco development team and Moco users, Thank you all for your contributions to the biomechanics community! I have some issues regarding the parameter selection of contact sphere , I would appreciate it if anyone could give me some advice. Contact spheres are usually used to simulate foot-ground ...
by Matthew Lee
Thu Jun 01, 2023 6:48 am
Forum: OpenSim Moco
Topic: Calling study.visualize in matlab will cause matlab to crash
Replies: 1
Views: 154

Calling study.visualize in matlab will cause matlab to crash

Dear Moco development team and Moco users, Thank you all for your contributions to the biomechanics community! I have some issues, when I call study.visualize() in my own code which including my own model and mocostudy, matlab will crash.If I delete the command study.visualize() ,matlab will not cra...