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Hi,

I was performing CMC on one of the models that I am developing in OpenSim. The RRA and CMC were computed without errors. While analyzing the data using MATLAB, I got the following error while executing osimTableToStruct(cmc_actuator_file_name).
When I opened up the actuation_force.sto file that is generated as a result of CMC, there were 8 extra columns with no header but only 0 in it. I think that was the reason for the error shown above.

These extra columns are generated for actuation_force, actuation_power, actuation_speed. (For some of these files it has a default value of 1000, but the values are the same throughout the file.)

It would be good to know how to fix these 8 extra columns. I could manually delete them but I have a lot of trials to process.

Thanks,
Vishal

Hi Vishal,

Since you're building/modifying models, the likely scenario is that you added state variables that have blank names or some other state variables that contain spaces in them and that causes the problem downstream. I would try to fix the problem with the names rather than the downstream issue of parsing files with missing or extra headers.

Please let us know if that's not the case or if you can reproduce using one of our distributed models.

Best regards,
-Ayman

Hi Ayman,

aymanh wrote: ↑

Tue Mar 30, 2021 10:41 am

Hi Vishal,

Since you're building/modifying models, the likely scenario is that you added state variables that have blank names or some other state variables that contain spaces in them and that causes the problem downstream. I would try to fix the problem with the names rather than the downstream issue of parsing files with missing or extra headers.

Please let us know if that's not the case or if you can reproduce using one of our distributed models.

Best regards,
-Ayman

Thanks a lot for the pointers. I did re-check my model to see if there are any blank names or variables that contain spaces. But unfortunately, the problem was not in those directions.

The reason for 8 columns without any headers but the values that are either 0 or 1000 is because there were 8 muscles that were disabled (on purpose) in the model by using the tags Therefore there were 8 extra columns in the actuator_speed, actuator_force, and actuator_power files that were generated. However, the CMC_states.sto didn't have that issue. It was caused in the output members of the "Actuation" analysis set.

Further, as per your suggestion, I tried to reproduce the problem using one of the distributed models. I took the example directory of Gait2392_Simbody.
In that, I performed Scaling->IK->RRA. After that using the RRA adjusted model I performed CMC by disabling one of the muscle "semiten_r" and tried performing the CMC. This resulted in the same problem that I posted.

I would like to attach the RRA adjusted osim file that is used to reproduce this error.

Please let me know if you could also reproduce this error.

Thanks a lot!

Best,
Vishal

Thanks for reporting. I was able to reproduce with gait10dof18 files from the distribution.

In the mean time, it seems like you could do a post-processing step to fix the error (either by adding back the column names for the missing headers and disabled muscles, or by removing the extra columns and fixing the "nColumns" count number in the metadata up top).