Question #645503 on Yade changed:
https://answers.launchpad.net/yade/+question/645503

Jan Stránský proposed the following answer:
> You are right about the NaN there are a whole bunch of them .. What
does this mean?

from my experience, most of the time this is because of too large time step. 
Try to use
factor = 0.1 # trial-and-error value
O.dt = factor * PWaveTimeStep()

let us know
Jan

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