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[xuelong14 <question659949@xxxxxxxxxxxxxxxxxxxxx>]

Question #659949 on Yade changed:
https://answers.launchpad.net/yade/+question/659949

    Status: Needs information => Open

xuelong14 gave more information on the question:
Sorry for confusing you.

Actually, I want to calculate the unbalancedForce by myself because I
only focus on part of the whole sample and want to know the
unbalancedForce of this part.

During the calculation, I need to calculate the average of the resultant
force of particles and the average contact force in this part. When I
tried to get the resultant force, I met the problem I mentioned. That
is, the sum of the forces of every element in one 2-sphere clump is not
the same as the force got directly from the clump. The code is below,

for body in O.bodies:
	if body.isClump:
		f1 = O.forces.f(body.id - 1)[0]; f2 = O.forces.f(body.id - 2)[0];
		f3 = f1 + f2; 
		print f3, O.forces.f(body.id)[0]

In it, f3 is not equal to O.forces.f(body.id)[0].

So I am really confused about it.

Thank you.

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