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Posted: **Tue Mar 26, 2019 5:44 am**

Hello, I would like to know how may I change a force through Matlab code.
I know that for torques is:

osimModel.updActuators().get('gear_load').addInControls(Vector(1, controlActionLoad(controlIteration)), modelControls);

But I would like to apply a force in a specific direction and in a specific point in a body. I would also like to change it at each iteration.

I appreciate any help with this matter.

Posted: **Thu Mar 28, 2019 2:13 am**

You can use the PrescribedForce:

https://simtk.org/api_docs/opensim/api_ ... Force.html

Use case example:

https://github.com/opensim-org/opensim- ... t.cpp#L149

Posted: **Tue Apr 09, 2019 1:05 pm**

Thank you for the response, Dimitar!

May I ask you how do I use PrescribedForce in Matlab? The example from the link is in cpp, and when I look for the same name in Matlab (PrescribedForce), it does not find it in org.opensim.modeling.*

Posted: **Tue Apr 09, 2019 1:09 pm**

Sorry, actually, I am able to create the force, but I do not know how I change it in Matlab.

Code: Select all

% Create force
pelvis_Force = PrescribedForce(pelvis);

pelvis_Force.setName('pelvis_force');
pelvis_Force.setForceFunctions(Constant(0), Constant(250), Constant(0));

% Add the force to the model
osimModel.addForce(pelvis_Force); % Add the force to the model

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Change forces in Matlab

Change forces in Matlab

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Re: Change forces in Matlab

Re: Change forces in Matlab