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[zhou qian <question679411@xxxxxxxxxxxxxxxxxxxxx>]

New question #679411 on Yade:
https://answers.launchpad.net/yade/+question/679411

Hi:
I am now using the periodic boundray and I need to modify the cell size in almost every steps.
I want to know how do the 'Values of velGrad accumulate in trsf'. 
For example, in the current step, the transformation(cell.trsf) is trsf1. And in the next step, I want the cell.trsf to be trsf2. So how to set the cell.velGrad?
It seems that velGrad=(trsf2-trsf1)/O.dt is not correct?
Yours,
Joe

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