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I am trying to run inverse kinematics on the Grand challenge 4th competition data. When I set it up with the trc file it automates to analyze from time 0 to 0 seconds. When I manually input the initial and final time it outputs that the "number of workunits cannot be negative". If I run IK externally via MATLAB only the first frame is analyzed. Any ideas on what the issue is??

sounds like the input file isn't the appropriate format. can you post the TRC file you're trying to track?

i get the error .trc is an invalid file extension to attach a file. But here is a google drive link to it https://drive.google.com/file/d/1dH50r3 ... sp=sharing

i'm not clear on how opensim parses a trc file but I do see that the header info in your file uses .txt rather than .trc (row 1) and that the frame data are not integers. that might be causing some problems?

I tried changing the header to .trc but it didn't help. What do you mean by the frame data is not integers? I couldn't see any decimals/fractions when I open the file in excell. Thanks

The file you uploaded is not formatted correctly. Please see the "Marker (.trc) Files" page in the Confluence documentation (https://simtk-confluence.stanford.edu/d ... c%29+Files). Specifically, you are missing a blank row before the first frame. You can test your file in the OpenSim GUI by selecting Preview Experimental Data... from the File menu.