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[Chiara Modenese <question188478@xxxxxxxxxxxxxxxxxxxxx>]

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

    Status: Answered => Open

Chiara Modenese is still having a problem:

On 22 Feb 2012, at 11:55, Chareyre wrote:

> Your 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.
Of course I meant the first case. OK, so the workaround is still necessary, I just wanted confirmation of that.

What about this second line?
if (aa.angle() > Mathr::PI) aa.angle() -= Mathr::TWO_PI;   // angle is between 0 and 2*pi, but should be between -pi and pi

Thanks,
Chiara

> The second case: does it make sense mathematicaly?
> 
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