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[Jan Stránský <question685280@xxxxxxxxxxxxxxxxxxxxx>]

Question #685280 on Yade changed:
https://answers.launchpad.net/yade/+question/685280

    Status: Open => Answered

Jan Stránský proposed the following answer:
Hi,

> unable to locate NewtonIntegrator within O.engines.

some error messages might be a bit cryptic, but this one is clear - you
do not have NewtonIntegrator in O.engines.

you have O.engines = [...] and just after you do some slicing (which in the end deletes NewtonIntegrator, probably not what you wanted).
Normally such slicing done when you need to modify O.engines during the simulation.
In this case, just put all engines directly in O.engines creation:
###
O.engines = [
   ForceResetter(...),
   ...
   triax,
   NewtonIntegrator(...),
   PyRunner(...),
   PyRunner(...),
   qt.SnapshotEngine(...),
   PyRunner(...),
]
###

cheers
Jan

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