[Rd] png error

[Terry Therneau]

I should have given more detail in my prior message. Here is an example of the error, from frailtyEM

Terry T

> ggplotly(pl2)
Warning in dev_fun(filename = tempfile(), width = width %||% 640, height = heigh
t %||% :
unable to open connection to X11 display ''
Error in .External2(C_X11, paste0("png::", filename), g$width, g$height, :
unable to start device PNG
Calls: ggplotly -> ggplotly.ggplot -> gg2list -> dev_fun
Execution halted

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