simtk.org

Posted: **Wed May 02, 2018 9:20 am**

Hi all

I'm trying to run a user plugin (MuscleForceDirection) for OpenSim3.3 through the MATLAB API. The plugin loads and runs fine in the GUI but when I try to run it through MATLAB I get the following error:

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Failed to load library MuscleForceDirection.dll 
ERROR- library MuscleForceDirection.dll could not be loaded.

Is there an installation step I'm missing for MATLAB that's specific to the plugin (I've configured MATLAB for OpenSim and added the plugin folder to the MATLAB path)? I've seen a fair few suggestions on the forum to run 'Model.LoadOpenSimLibrary()' but this seems to have no effect.

Cheers

Michael

Posted: **Fri May 04, 2018 3:30 pm**

Leave off the ".dll" argument when you invoke `Model.LoadOpenSimLibrary`.

Posted: **Tue May 08, 2018 1:58 am**

Hi Christopher

I've tried this, but unfortunately the result is the same. Do you have any other ideas?

Posted: **Tue May 08, 2018 10:56 am**

Can you share snippets of your code causing the error?

Posted: **Thu May 10, 2018 5:36 am**

Yeah sure, it's essentially just this:

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plugin2load = 'MuscleForceDirection.dll';

Model.LoadOpenSimLibrary('C:\OpenSim 3.3\plugins\MuscleForceDirection');

dos(['analyze -S ',LoAxml,' -L ', plugin2load], '-echo');

With 'LoAxml' being the path to the settings xml for the analysis.

Posted: **Thu May 10, 2018 8:38 pm**

You aren't actually using the OpenSim API through MATLAB when you use the dos() function. I think you want to do something like this:

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myAnalysis = AnalyzeTool(LoAxml);
myAnalysis.run();

See the "setupAndRunAnalyzeBatchExample.m" example on the "Scripting with Matlab" page in the Confluence documentation (https://simtk-confluence.stanford.edu/d ... ith+Matlab).

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