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[liukeqi <question313437@xxxxxxxxxxxxxxxxxxxxx>]

Question #313437 on Yade changed:
https://answers.launchpad.net/yade/+question/313437

Description changed to:
Hello, 
    I want to control the strain and let YADE return stress. But I do not understand the O.cell.trsf and O.cell.velGrad very well. Is the value of O.cell.trsf equal to the value of multiplying O.cell.velGrad with steps of O.run() and O.dt? And in one model, after I use O.cell.velGrad to control the strain and do the O.run, can I use another O.cell.velGrad to control an new strain, Is the second strain state starting from the first strain state? If I want to start from the first strain state, how can I do it? 
    If I use the O.cell.velGrad, is there some necessary conditions? For example, the steps of O.run() to guarantee the output stress relative steady. Whether I can control the stress at the same time or not? I am not clear about the O.cell, for example, the relationship between the stress tensor matrix obtaining from yade._utils.getStress and the stress vector obtaining from Peri3dController(p3d.stress in the example), is there some simple references about it? 
    Can you give me some suggestions? Thank you.

Keqi

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