Question: Is it possible to overwrite output?

I would like to overwrite a plot that's updated within a loop over time. 

I used animate already, but the problem is that it's  only updated at specific points in time (not regularly distributed) and with animate I can only use frames that are equally divided over the wholre range. To update each time step costs unneeded memory and time. 

I hope that there exists a better solution.

thanks for your help.

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