Question #251328 on Yade changed:
https://answers.launchpad.net/yade/+question/251328

    Status: Open => Answered

Jérôme Duriez proposed the following answer:
Hello,

Doing, in a PyRunner, something like ? (be carefull about the order !)

currentPD = i.geom.PD
PDincrement = currentPD - previous PD
previousPD = i.geomPD

;-)

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