simtk.org

Dear users,

I am wondering whether it is possible to plot the musculotendon curves in the GUI (as done here: https://simtk-confluence.stanford.edu/d ... don+Curves) and whether it is then possible to inspect these curves following any modifications to their underlying parameters?

Kind regards,

Nicos Haralabidis

You can use the printMuscleCurveToCSVFile() methods and plot in Excel or MATLAB. See, for example, https://simtk.org/api_docs/opensim/api_ ... 338abc6da9.

Thanks for the prompt reply Tom.

I have had a chance to look at the source you provided. I am attempting to access the class through the Matlab API.

Do I need to down cast the properties of a particular muscle, e.g. glut_med1_r, by implementing:
ActiveForceLengthCurve.safeDownCast(osimModel.getMuscles().get(0))

Then followed by ActiveForceLength.printMuscleCurveToCSVFile() ?

Kind regards,

Nicos Haralabidis

The ActiveForceLengthCurve() class is only a method for the Millard2012 type muscles;
https://simtk.org/api_docs/opensim/api_ ... uscle.html

Good morning James,

Thanks for your reply! I have managed to successfully implement the method.

For anyone else interested in visualising the musculotendon curves this is the rough code I used for Matlab:

import org.opensim.modeling.*

osimModel = Model('LaiArnold2017_refined_arms.osim');
model_muscles = osimModel.getMuscles();
muscle = model_muscles.get(0);
muscle_millard = Millard2012EquilibriumMuscle.safeDownCast(muscle);

muscle_millard.getActiveForceLengthCurve().printMuscleCurveToCSVFile('folder/folder');

The same can be done for the ForceVelocityCurve, FiberForceLengthCurve and TendonForceLengthCurve.

Nicos