Hi,

I have installed R on a computational cluster, and am using putty to access
R. Please help on how to solve the problem of saving png files.

> png(file="myplot.png", bg="transparent")
Error in X11(paste("png::", filename, sep = ""), width, height, pointsize,
:
        unable to start device PNG
In addition: Warning message:
unable to open connection to X11 display ''

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