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[Jérôme Duriez <question695164@xxxxxxxxxxxxxxxxxxxxx>]

Question #695164 on Yade changed:
https://answers.launchpad.net/yade/+question/695164

    Status: Open => Answered

Jérôme Duriez proposed the following answer:
Maybe your interactions in O.interactions are not real. Non-real
interactions are accounted for if you ask for len(O.interactions), but
they are skipped in the for i in O.interactions: loop

Also note that for any Vector3 "vec" in yade terminal, like
O.bodies[id1].state.pos - O.bodies[id2].state.pos, you have directly
access to a .norm() function: vec.norm()

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