Hi All,
I am now using R version 2.5.1 under Linux (Red Hat), and have
some problems to use some graphical devices (e.g., png, jpeg, bmp
and so on). Can you tell/teach me how to solve the problem(s)? See
below for details.
(1) I make sure that package:grDevices is on the list using
search(), for example:
> search()
[1] ".GlobalEnv" "package:stats" "package:graphics"
[4] "package:grDevices" "package:utils" "package:datasets"
[7] "package:methods" "Autoloads" "package:base"
(2) I use png() and got the error:
> png()
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 '' in: png()
(3) I use X11() and obtained the error again
> X11()
Error in X11(display, width, height, pointsize, if
(is.null(gamma)) 1 else gamma, :
unable to start device X11
In addition: Warning message:
unable to open connection to X11 display '' in: X11()
thank you very much for the help.
Howard
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