问题
I googled this to no avail. I must have unknowingly changed some setting because now when I print a plot or histogram rather than displaying the plot in the plots window, a new window opens with the plot. The title of the new window reads "R Graphics: Device 2 (ACTIVE)".
回答1:
It is a problem that appeared with R 3.3.0 for some RStudio versions. You can check your version with version in RStudio.
It should work with a RSudio 0.99.902.
For more details, check here.
回答2:
Some code you ran probably pushed a new graphics device onto the stack. You can turn it off with:
> dev.off()
See the R documentation for managing output devices.
来源：https://stackoverflow.com/questions/37258243/display-graphics-in-plots-window-pane-rather-than-opening-new-window-in-rstudio