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[Jan Stránský <question678500@xxxxxxxxxxxxxxxxxxxxx>]

Question #678500 on Yade changed:
https://answers.launchpad.net/yade/+question/678500

    Status: Open => Answered

Jan Stránský proposed the following answer:
For next time, MWE = Minimal Working Example [1].

in your case, the plot becomes transparent because there are not
continuous data to plot (plot .addData adds NaN in case some data are
missing):

>   plot.addData(i=O.iter,e=log(kineticEnergy()/n), **O.energy) # 1st plot.addData, adding NaN for pos_z
>   if O.iter >=0.8*1e4:
>       plot.addData(i=O.iter,pos_z=O.bodies[0].state.pos[2]) # 2nd plot.addData, adding NaN for e

solution:

if O.iter > ...:
   plot.addData(i=...,e=...,pos_z=...
else:
   plot.addData(i=...,e=...)

Jan

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

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