[R-SIG-Mac] saving graphs; jpeg(), bitmap()

stefano iacus stefano.iacus at unimi.it
Thu Dec 9 00:41:06 CET 2004

Hi Tiago,
you need to run the X11 server first indeed.
Close R and try just to launch X11 from its icon.
If it doesn't launch, please have a look at the Console Application 
window to see what's happening. Let us know.

On Dec 8, 2004, at 11:50 PM, Tiago R Magalhaes wrote:

> Dear Mac R-users
> I want to export some plots. I have looked in the documentation and in 
> the R-help archives. 2 main functions jpeg(), bitmap() are used, but I 
> can't save any plots using them. (error logs at the end of the email). 
> I'm using a PowerBook G4, Panther 10.3, R.2.1.
> a) when using jpeg() I seem to be missing the X11 server. I have X11 
> on my computer and it works fine. (XDarwin 1.3b4). On the R menu, 
> under Miscillaneous there is a Run X11 server. When I lauch it reports 
> an error:  "2004-12-08 22:24:13.082 open[10513] Couldn't launch 
> application:  X11.app"
> b) for using bitmap() I don't have the ghostscript file. Is it a mac 
> file? Should I get it from somewhere?
> c) I saved the files from the quartz device with the menu function. 
> This solves the problem somewhat, but: I would like to save jpeg 
> files. Even if I save pdf I would like to write it in a script. pdf() 
> should do it, but I can only produce files with zero bytes using it...
> d) and this is really just curiosity. The pdf file exported via menu 
> is small (16kb) but when I open it in Photoshop and tell it to be 
> 300dpi becomes a big file (14Mb) and the quality is very good! I 
> imagine this to be related to vectors instead of dots. I googled the 
> terms, but there's nothing that mention pdfs as good grahp formats (I 
> didn't do an extensive search, there were MANY documents, even trying 
> to be very stringent)
> #####################
> errors
> jpeg('pic1.jpg')
> Error in X11(paste("jpeg::", quality, ":", filename, sep = ""), width, 
>  :
> 	unable to start device JPEG
> In addition: Warning message:
> unable to open connection to X11 display`'
> bitmap('temp.jpg', type='jpeg', res='300')
> /bin/sh: line 1: gs: command not found
> Error in bitmap("temp.jpg", type = "jpeg", res = "300") :
> 	Sorry, gs cannot be found
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