simtk.org

Dear users,

I am currently having some difficulties running the Matlab RRA Optimization algorithm developed by Dr Michael Samaan.

https://simtk.org/projects/rra-opt-gui/

I am using a 64-bit windows 10 laptop, 64-bit 2017b Matlab, and 64-bit OpenSim 3.3.

I have added the contents of the folder to the current path in Matlab, I then populate the relevant GUI fields with the required information following the instructions provided in the user guide.
The optimization then commences, but all I see in the command window is NaN's - which I do not think should be appearing? Also the figure is not populating.
I have also checked the out.log file and I receive the following message:

Constructing investigation from setup file C:\OpenSim.


Exception:
Object: ERR- Could not open file C:\OpenSim. It may not exist or you don't
have permission to read it.
file= C:\OpenSim33\src\opensim32\OpenSim\Common\Object.cpp
line= 114


Has anyone else encountered these issues? If so, how did you please resolve them?

Kind regards,

Nicos Haralabidis

Exception:
Object: ERR- Could not open file C:\OpenSim. It may not exist or you don't
have permission to read it.
file= C:\OpenSim33\src\opensim32\OpenSim\Common\Object.cpp
line= 114

This reads as there is a filepath specific somewhere as 'C:\OpenSim'. Since that is a path to a directory and not a file, it is causing an error.

Hi Nicos,

I had this same problem, which was solved by doing the following:

-Make RRA_OPT_GUI_R1 your cd in matlab
-Add Matlab_Code_GUI folder and subfolders to your path
-Copy over all of the following files associated with the model/trial you are trying to optimize to the RRA_OPT_GUI_R1 folder:
grf.mot file
grf.xml file
ik.mot file
setup_ReduceResiduals.xml file
rra_actuators.xml
rra_tasks.xml
rra_controlconstraints.xml
model.osim
id.sto file (I'm pretty sure this one isn't actually needed, but copied over with all the others anyways)
-Make sure that all of your setup.xml files are calling in the files with the correct path since you changed these file paths when copying the files to the RRA_OPT_GUI_R1 folder.

Hopefully this fixes your error like it did for me.

Hi both,

Thanks for your replies! I had a feeling it was due to the file locations.

I will report back after I have tried your suggestion Kenneth.

Kind regards,

Nicos Haralabidis

Your suggestion worked nicely Kenneth!

The optimization is running smoothly now.

Thanks for your input.

Nicos