Question #228866 on Yade changed:
https://answers.launchpad.net/yade/+question/228866
Status: Open => Answered
Luc Scholtès proposed the following answer:
Hi Ray,
len() is a python function, not a specific yade function.
It is defined in the python documentation there:
http://docs.python.org/2/library/functions.html?highlight=len#len
len(O.bodies) returns the number of 'bodies' defined in the current
simulation (O).
Cheers
Luc
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