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[Jérôme Duriez <question517125@xxxxxxxxxxxxxxxxxxxxx>]

Question #517125 on Yade changed:
https://answers.launchpad.net/yade/+question/517125

    Status: Open => Answered

Jérôme Duriez proposed the following answer:
Hi,

The error says it: you're dealing with list objects e.g. "cube" which namely is a "SpherePack" object (see randomDensePack() doc).
Whereas you have to deal with "Body" objects to access e.g. state.vel.

A possible method is to type:
ids = O.bodies.append(cube) # O.bodies.append returns a list of ids of created YADE bodies
for id in ids: # we iterate on all the particular id in this list
    O.bodies[id].state.vel = .... # O.bodies[id] is now one Body object

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