plot.new has not been called yet

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Some action, very possibly not represented in the visible code, has closed the interactive screen device.
It could be done either by a “click” on a close-button, or it could also be done by an extra dev.off() when plotting to a file-graphics device. (The second possibility might happen if you paste in a multi-line plotting command that has a dev.off() at the end of it, but had errored out at the opening of the external device. So the dangling dev.off() on a separate line accidentally closes the interactive device).

Some (most?) R implementations will start up a screen graphics device open automatically, but if you close it down, you then need to re-initialize it.
On Windows that might be window(); on a Mac, quartz(); and on a Linux box, x11(). You also may need to issue a plot.new() command. I just follow orders. When I get that error I issue plot.new() and if I don’t see a plot window, I issue quartz() as well. I then start over from the beginning with a new plot(., ., ...) command and any further additions to that plot screen image.

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