Question #683981 on Yade changed:
https://answers.launchpad.net/yade/+question/683981
Status: Open => Answered
Robert Caulk proposed the following answer:
It is the default value passed to the function in the case that the user
does not provide it. In this case '-1' is essentially a flag to direct
the algorithm toward one of the four described methods of sphere radius
distribution specification.
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