Java Exception error when adding a force

[Yong Cho]

Hello, I am trying to add a force to a certain part of a arm however, I am getting this error below when I try to use the code "model.addForce(force)". The code I have for now is below the error. What am I doing wrong?

Error using arm26Force (line 24)
Java exception occurred:
java.lang.RuntimeException: ModelComponent: Cannot include subcomponent after addToSystem().

at org.opensim.modeling.opensimModelJNI.Model_private_addForce(Native Method)

at org.opensim.modeling.Model.private_addForce(Model.java:291)

at org.opensim.modeling.Model.addForce(Model.java:88)

Code: Select all

import org.opensim.modeling.*

model = Model('C:\Users\Yong Cho\Documents\OpenSim 3.3\Models\Arm26\arm26.osim');
cSet = model.getCoordinateSet()
initState = model.initSystem()

r_shoulder_elevation = cSet.get(0)
r_elbow_flex = cSet.get(1)

r_shoulder_elevation.setDefaultLocked(1)
r_elbow_flex.setDefaultLocked(1)


body  = model.getBodySet().get('r_ulna_radius_hand');
force = PrescribedForce(body);

force.setForceFunctions(Constant(15), Constant(0), Constant(0));
force.setPointFunctions(Constant(0), Constant(-0.180496), Constant(0))


force.setPointIsInGlobalFrame(0);
force.setForceIsInGlobalFrame(0);

model.addForce(force)  % line 24 where the error happens

model.print('C:\Users\Yong Cho\Documents\OSFolder\arm26e2PrescribedForce1.osim');

[jimmy d]

Are you using the 3.3 or 4.0 (Beta) API?

[Yong Cho]

3.3

[jimmy d]

Code: Select all

Java exception occurred:
java.lang.RuntimeException: ModelComponent: Cannot include subcomponent after
addToSystem().

	at org.opensim.modeling.opensimModelJNI.Model_private_addForce(Native
    Method)

	at org.opensim.modeling.Model.private_addForce(Model.java:291)

	at org.opensim.modeling.Model.addForce(Model.java:88)

ModelComponent: Cannot include subcomponent after addToSystem().

initSystem() invokes addToSystem(); you can't add components once this is invoked. You are trying to add a component to the model after you have built the system.

To fix, just put initSystem() in after you have added all the things you want to add to the model.

[Yong Cho]

I see, thank you!