Bug or not

I have this sample from help. I try use command erase.screen() but in 
split mode sreen dont erase. Why?

Not a bug.

 From the documentation:

 'erase.screen' will appear not to work if the background colour is
     transparent (as it is by default on most devices).

So make sure to specify par(bg="white") first, as in the example
given in the documentation ...

 Ben Bolker

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