Question #660590 on Yade changed:
https://answers.launchpad.net/yade/+question/660590

    Status: Open => Answered

Bruno Chareyre proposed the following answer:
>Does it mean that users has to always apply "O.reset()" when they have
"erase" and "clear" in their Yade scripts?

I don't understand the details of this discussion (it is especially unclear to 
me why one needs to "save/load", then "erase/append", when the objective seems 
to be just "append").
However I do think O.reset() is not the solution. It is supposed to wipe out 
the simulation completely (engines, materials, interactions, ... not only 
bodies). So of course an empty simulation in which you insert a few bodies is 
not crashing but it is also not doing anything (no movement). I'm not sure it 
is very interesting.
Are you really sure you need two distinct scripts to achieve what you want?
Bruno

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