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[张文卿 <question432620@xxxxxxxxxxxxxxxxxxxxx>]

New question #432620 on Yade:
https://answers.launchpad.net/yade/+question/432620

I‘m using getStress（） to monitor my 'peri'.In doucumentation,it says stress is negative for  repulsive contact forces.So,I wanna try  if it'scorrect.I used it for a simple example:bouncingbubble.py.And something wierd show up.Stress is(nan，nan，nan，0,0,12.644,0,0,34.8838）.Can anyone explain that?

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