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[Chareyre <question188478@xxxxxxxxxxxxxxxxxxxxx>]

Question #188478 on Yade changed:
https://answers.launchpad.net/yade/+question/188478

    Status: Open => Answered

Chareyre proposed the following answer:
By "difference", do you mean q1*q2^-1 or q1-q2?
The first case should be safe now if eigen fixed the problem (I think they should but I didn't keep exact track of what they did), else the isnan() test is a workaround.
The second case: does it make sense mathematicaly?

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