[R] Graphics after invoking R from the command line

[Mithun Jacob]

>>Duncan Murdoch

I wish to run R with Visual C++ as a front end. So I was hoping to run
a file such as graph.r in the following manner:

R --slave --save --file=graph.r

But when the plot function runs, it does not display the graph.

>>Prof Brian Ripley:
So would I be correct to assume that it's not possible to run graphics
in batch mode?

Thanks for all the help!

Regards,
Mithun

On 11/28/07, Prof Brian Ripley <ripley at stats.ox.ac.uk> wrote:
> On Wed, 28 Nov 2007, Mithun Jacob wrote:
>
> > I've tried running graphics commands like plot by invoking R at the
> > command line but the graphics window does not appear. I'm using
> > R-2.6.0 on Windows XP and am using the cmd shell. Here's a sample
> > session:
> >
> > R --slave --save --file=-
> > x<-c(1,2,3,4)
> > plot(x,x)
> >
> > This leads to nothing. I've found a way around it, but the graph
> > window is frozen and commands to it have to be sent twice for the data
> > to appear.
> >
> > R --slave --save --file=-
> > x<-c(1,2,3,4)
> > windows()
> > plot(x,x)
> > plot(x,x)
> >
> > Am I doing something wrong here? It would be nice if I could display a
> > graphics window which isn't frozen.
>
> So use R interactively, rather than in batch mode typing at stdin. (Using
> --file puts you into batch mode.) Only in interactive use does the event
> loop give time to windows such as the screen device, pagers, data frame
> viewers ....
>
> I have no idea where you got the idea of 'R --slave --save --file=-' from:
> the way to use R 'at the command line' on Windows is to use Rterm.
> 'Rterm --slave --save' would do the same without the freezing, but most
> people do find prompts useful.
>
> --
> Brian D. Ripley,                  ripley at stats.ox.ac.uk
> Professor of Applied Statistics,  http://www.stats.ox.ac.uk/~ripley/
> University of Oxford,             Tel:  +44 1865 272861 (self)
> 1 South Parks Road,                     +44 1865 272866 (PA)
> Oxford OX1 3TG, UK                Fax:  +44 1865 272595
>