You need to open/run Matlab with administrator privileges (if I am not mistaken there is a step-by-step guide on the OpenSim website with regard to this: http://simtk-confluence.stanford.edu:80 ... ith+Matlab).

Hi Nithin You can run BodyKinematics to get the (instantaneous) velocity, and then calculate the average velocity to use in subsequent computations. Alternatively you can get velocity from SimbodyEngine (this is what I am trying to do, my code is in a recent post on this forum but it is not working!...

Hi Nithin You should not get a scalar out of this. Using getVelocity() you are asking for the linear velocity [x,y,z] at a specific time (given by the state) of a point (in your case the center of mass) of a body (in your case the hand). So in an attempt to answer your questions: 1. it is instantane...

Hi Andrea I assume that you are using the Davis marker protocol to collect data in studies related to ... in an elderly population. There is a tool available from Padua, it is called MOtoNMS (it helps you organise your datacollection files and processing for use in OpenSim0. I am not related to this...

Thanks so much Sherm! The u_est approach works, I will make sure to evaluate the noise this might introduce. For others interested in this (I will make the full code available once a publication has been submitted): estimate the velocity using one of the approaches mentioned by Sherm and then add i...

Hi Sherm, Thank you for your reply. I have since my post tried various forms and always seemed to end-up at the same result (zero velocities). I will try the suggested u_est approach since it seems that this will be more efficient. I plan to use this in an Kalman Filter where my state contains the q...

Hi all I am trying to perform a runtime analysis (frame-by-frame, as data becomes available) based on generalized coordinates. I calculate generalized coordinates and would like to get segment velocity (linear and angular) back from OpenSim. This output can also be obtained from BodyKinematics, but ...

Thanks Sherm
I will try the approach you suggested and will try to remember to post a link to the working code files once I have it up and running (I am in the middle of a few other things so I might take a while).
Once again, thank you to both of you for dedicating time to my question!

Thanks for the advice, My goal was to try and see if I could simulate soft-tissue artefact (replacing the weld joint by a spring-damper connection) to replicate a more realistic scenario of an object (inertial sensor, orthesis,shoe,...) connected to the human body. In this more realistic case there ...

Hi Sherm. I am indeed trying to get the local angular velocity, as if it were measured by a 3D gyroscope. In case this sensor is not perfectly aligned with the body segment (the tibia in the example data), then I would expect to see this offset in orientation to be reflected in the angular velocity ...