[R] non-interactive R usage...

Johann Petrak johann at ai.univie.ac.at
Fri Oct 5 18:15:20 CEST 2001

Chris Milkosky wrote:

> Does R give you the capability to run a script (read as non-interactive) that would perform a statistical task, and then send output
> to a file?  For example: read a set of data from a file, generate a JPEG _file_ containing a plot of the data (with some specific
> stat calcs plotted of course), and then exit?
> I do capacity planning and would like to be able to have JPEG plots of real time statistical data appear on web pages, so I'm
> thinking that a CGI can be executed that starts R up, generates a plot, and writes it to a file.  We currently use gnuplot, but with
> all of the statistical needs we have, it is turning out to be less flexible than we had hoped.

There are two questions in there:
   - how to run R non-interactively: look at the BATCH option
     (try the command: 'R BATCH --help')

   - how to store the output of a plot command in a JPG file: this
     is done by using the "jpeg" device instead of the 'x11' device.
     Try 'help(Devices)' and 'help(jpeg)' in R for a start.


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