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[Yuxuan Wang <question691829@xxxxxxxxxxxxxxxxxxxxx>]

Question #691829 on Yade changed:
https://answers.launchpad.net/yade/+question/691829

    Status: Needs information => Open

Yuxuan Wang gave more information on the question:
Thanks for getting back to me, Jan! 
When I entered  O.pause() in the terminal and called for "pred", the output was as in my original question, "NameError: name 'pred' is not defined". The same issue happened when I called for "assembly". That was why I thought the predicate was not applied. 

Another thing that led me to that conclusion was this: particles in the
compressed pack (sp) outside of the predicate (pred) were not deleted
after I applied "filterpack". Now coming to think of it, filterpack
probably only selects particles within the predicate region but doesn't
delete other particles?

However, the fact that you were able to see a reduction in # of bodies
means "pred" was recognized by the program. Is that truely the case even
though the terminal outputs show they are undefined?

Regards,
Yuxuan

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