[R] X11 png jpeg cledit false when running from script

[Bachas]

I had the same problem and my conclusion was also that the problem was that
our server was not running an X server.
I also found that bitmap(file="filename.jpg",type="jpeg");  works.. However
I want to store my plots in single jpeg files.. Unfortunately
bitmap(file="Rplot%03d.jpeg",onefile=FALSE,type="jpeg" does not work for
bitmap()..

Any ideas on how to generate multiple jpeg files from my plots/ etc ?



Marc Schwartz (via MN) wrote:
> 
> On Wed, 2005-12-14 at 15:53 -0800, Jon Dressel wrote: 
>> Hello,
>>  
>> When launching R from a script, when queried it reports the following
>> capabilities as false: jpeg, png, x11 and cledit.  When R is run from a
>> terminal session, all of these capabilities are reported true.  R is
>> running on FC4. As the purpose of this script is to output the png file
>> to a browser, it is unable to complete because of this.  Any ideas are
>> appreciated.  We have an identical setup running on FC3 and there is not
>> a problem.
>>  
>> Thanks,
>>  
>> Jon Dressel
> 
> Without the script you are using and perhaps how you installed R, it is
> hard to provide specific details here, especially given the differences
> you are observing between FC3 and 4.
> 
> In general, cledit being FALSE suggests that R is being run
> non-interactively. So I am guessing that you are calling R from the
> command line in some fashion and running a R program via stdin
> redirection or running R in BATCH mode. For example:
> 
> $ echo "capabilities()" | R --slave --vanilla
>     jpeg      png    tcltk      X11 http/ftp  sockets   libxml     fifo
>     TRUE     TRUE     TRUE     TRUE     TRUE     TRUE     TRUE     TRUE
>   cledit    iconv      NLS
>    FALSE     TRUE     TRUE
> 
> Note however that jpeg, png and X11 are all TRUE as I ran the above from
> a console with X running on my FC 4 laptop using GNOME.
> 
> That jpeg, png and X11 are FALSE when running your script suggests that
> the actual machine you are running R on in that instance is not running
> an X server. That is what I get, for example, when I change to init 3
> (text mode) and run the above again from the command line.
> 
> Are you running a remote login session of some type to a box that is not
> running X or is your script calling a remote R session?
> 
> If so and you need to be able to generate plots, you can use bitmap()
> which does not require X to be running, or you can also use Xvfb on the
> other box, which is the X virtual frame buffer. See 'man Xvfb' for more
> information.
> 
> I do the latter when performing certain analyses on a RHEL server
> running Oracle 10g, where we have integrated some online reporting
> functionality for clients. I wrote some R programs which create PNG
> plots as required. Our DBA's call/run the R programs on the server via
> TCL code and then put the resultant plots into an HTML page created
> dynamically. The server is not running X, so we use Xvfb.
> 
> You might also want to see R FAQ 7.19 How do I produce PNG graphics in
> batch mode?, which covers the above.
> 
> HTH,
> 
> Marc Schwartz
> 
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