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[Jan Stránský <question678646@xxxxxxxxxxxxxxxxxxxxx>]

Question #678646 on Yade changed:
https://answers.launchpad.net/yade/+question/678646

    Status: Open => Answered

Jan Stránský proposed the following answer:
Hello,

there are several options. E.g. storing the position by PyRunner.
You can store the values in separate variable or using plot module [1]

A MWE:
###
from yade import plot

O.bodies.append(sphere((0,0,0),1))
O.engines = [
   ForceResetter(),
   NewtonIntegrator(gravity=(0,0,-10)),
   PyRunner(iterPeriod=10,command="trackParticle()"),
]

def trackParticle():
   b = O.bodies[0]
   pos = b.state.pos
   plot.addData(i=O.iter,pos=pos)

O.dt = 1e-2
O.run(100,True)
print plot.data["pos_z"]
###

cheers
Jan

[1] https://yade-dev.gitlab.io/trunk/user.html#tracking-variables

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