Hi Saylee, I would use the task, constraints and actuator files from this project as a start to run RRA and CMC (https://simtk.org/frs/?group_id=773). All the bodies and degrees of freedom should be identical so they should work. Then from there, you can tweak the files to suit your purpose. Good lu...

I've come across this problem in the past and I used either a weld or point constraint to connect two bodies that have already been assigned joints.

Good luck!

ADrian

I checked through my steps and the odd behaviour of tX seemed to disappear once I filtered the IK output at 8 Hz using the built in OpenSim filter (see Figure 1). I was filtering the data at 4 Hz... likely too low! The data from the first figure is of purely the flight phase, but I still have very ...

Hi Nicos, I have a few things you can check to see if it helps. You should check your filtering techniques of your inverse kinematics (i.e. joint angles) and particularly your ground reaction forces. If you're using a standard Butterworth filter with low cut-off frequencies, you're likely to get ove...

Hi Tom and Chris, I might be able to help here. When I've run parfor in MATLAB with the OpenSim API, a new instant of the model was needed for each loop iteration (see the code below). It means that each thread must have a unique model in which to use rather than one that has been previously initial...

Ahh sorry for the misunderstanding Tom. I missed the part where the count started at 0 so I was only initialising the size of my rForce and rTorque to either model.getBodySet().getSize()-1 or model.getJointSet().getSize(), which both caused the error. Perfect! Thanks for working me through to a solu...

Hi Tom, Thanks for the information. From the test code I sent earlier, using your function, I can obtain rForces and rTorques that equal to the number of joints in my model (I'm running OpenSim 3.3). It works fine when I run the code the first time around. However, when I re-run the code or re-open ...

Thanks for the function Tom. It works and I can get reaction forces at all the joints. However, I'm not sure if it's due to my computers (I've tried it on two computer so far), but after running the function once, the second time I run osimModel.getSimbodyEngine().computeReactions(osimState,rForce,r...

Hi Chris and Tom, I've tried the following code but my MATLAB crashes. Can you point me in the right direction? import org.opensim.modeling.* model_name = 'test_model.osim'; osimModel = Model(model_name); osimState = osimModel.initSystem(); no_joints = osimModel.getJointSet.getSize(); temp_vector = ...

Thanks Tom! I'll let you know how it goes.