[R-SIG-Mac] saving graphs; jpeg(), bitmap()
Tiago R Magalhaes
tiago17 at socrates.Berkeley.EDU
Wed Dec 8 23:50:20 CET 2004
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 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
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)
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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