Hello, I am looking for simulated/experimental data to validate my model (human hand dynamic). More specifically, joint torques with its related motion file. I want to do the simulation in Opensim and then evaluate my model (in Matlab) based on the dynamic simulation results of opensim. Could you pl...

Hello, I am trying to edit '2nd_Hand_Model_An_attachments' in a way just to calculate muscle length and moment arms in Matlab. Using the current model takes long calculation time. I think it is due to calculating other values that I do not need. Anyone can suggest which important things should I kee...

Hello, I am building an upper limb model in Simulink. I need information about Bone ( positions and orientation ), Muscle path (origin/Via/insertions), and wrapping sufaces. Anyone can help me in how can I extract these information from OpenSim model using MATLAB? Where can I find sample codes ? Reg...

Hello, I am calculating muscle length and moment arm through M-file and S- function. It takes long time to get the results. I am not sure why it is very slow but I expect that the due to calculating model parameters that I do not need. Is there a way to make it faster by deactivating other calculati...

I checked the number of frames in the saved data file and found it 348 while the original motion file and Matlab processed data 350..what could be the reason to get 348 in OpenSim not the same number of frames?

PS in the plot,I plotted each data with its corresponding time points

Hello all, I am trying to calculate moment arm using MATLAB interface. To check the interface I compared calculated moment arm from OpenSim (uing plotter, then data export) with the calculated in MATLAB script. I got either a time shift or a differnce in the values as in the attached fig as an examp...

Hello,

I am using 'getMuscleLength' in MATLAB script. I got an error : Undefined function or variable 'getMuscleLength'.

Is muscle.getLength(state) the same as muscle.getMuscleLength(state)?

Hello,

1- I used the code below in Maatlab scripting:
and got the error:
Undefined function or variable 'realizePosition'.

2- What is the difference between myModel.realizePosition and myModel.updCoordinateSet

Can anyone advise?

I would also suggest checking this link:

http://simtk-confluence.stanford.edu:80 ... MomentArms

Hello, To get muscle attachment points and details of wrapping surfaces you have 2 options: 1- oppening the modeel.osim using text viewer and I opened it in Excel it was more organised 2- From openSim software using Muscle Editor (as recommended by Tom Uchide , See, for example, the "Muscle Editor" ...