It's not a bug and it is my understanding that it's documented.
From the man page on jpeg:
They may not be usable unless the X11 display is available to the
owner of the R process.
and later:
'bitmap' provides an alternative way to generate PNG and JPEG
plots that does not depend on accessing the X11 display but does
depend on having GhostScript installed. (Devices 'GDD' in CRAN
package 'GDD' and 'CairoJPEG' / 'CairoPNG' in CRAN package 'Cairo'
are alternatives using several other additional pieces of
software.)
So, the idea is to replace your jpeg() call by bitmap() (with the
appropriate "type" argument.
b
On Feb 19, 2008, at 8:25 AM, [EMAIL PROTECTED] wrote:
Full_Name: Stephane Bonneaud
Version: 2.6.2
OS: OSX - Leopard 10.5.2
Submission from: (NULL) (195.221.233.130)
Hello,
I have a R code file containing the following code:
-------
# This code is in r2jpg.r
# myData is filled here with some data from a file
jpeg
(filename="test.jpg",width=960,height=720,pointsize=16,quality=100)
plot(myData,xlab="anything", ylab="whatever",type="b",col="red",
lwd=4)
dev.off()
-------
I executed this code within both the R GUI and the command line.
When launched
through the R GUI (Mac OS X Cocoa GUI - GUI 1.22-devel (4844) (4844)),
everything works just fine. The JPEG file is generated just I want.
Great!
The problem is when I try to execute the code through the command
line in
Terminal (OSX).
I execute my code using the following command :
cat r2jpg.r | R --silent --no-restore --no-save
And I get the following error:
jpeg
(filename="test.jpg",width=960,height=720,pointsize=16,quality=100)
can't find X11 font
Error in X11(paste("jpeg::", quality, ":", filename, sep = ""),
width, :
impossible to start the peripheral JPEG
Calls: jpeg
(Sorry, I translated the error messages from french so it might be a
little
different in english. If needed I can print it in english though)
I saw that several persons had this problem, but did not find any
proper
solution. Therefore, I tried to launch my command from xterm (still
in OSX) and
not in Terminal, and it worked. There is definitely an issue with R
getting the
proper environment variables for X11 or something like that when
launched from
the command line in Terminal.
When you launch the GUI, OSX detects it will need X11 (or something
like this
:b), therefore all proper env variables are charged. From xterm,
obviously the
proper env variables are set.
How could R tell OSX to link with X11 when launched from command
line in
Terminal?
PS: sorry, it might be a leopard bug, but I thought somebody could
be interested
in the R community. And maybe R developers might actually be able to
do
something.
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