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[Jan Stránský <question685885@xxxxxxxxxxxxxxxxxxxxx>]

Question #685885 on Yade changed:
https://answers.launchpad.net/yade/+question/685885

Jan Stránský proposed the following answer:
Hello,

velVec is assigned a value inside an if condition (if aTime>0.005).
This condition is false (you can easily check, O.dt=0.0001, iterPeriod=1) and velVec therefore has no value.
Then you try to assign it to translation engine, but it is currently just nothing, so Python comes with this error.

cheers
Jan

PS: have look at [1], section "Please, no external links!" ;-)

PPS: aTime = (O.iter*O.dt) ... you can use directly aTime = O.time

[1] https://www.yade-dem.org/wiki/Howtoask

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