R help - Nov 2007 - Graphics after invoking R from the command line

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.

Regards,
Mithun

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

On 11/28/2007 12:05 PM, 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.
Do you really need to run R --slave?  R is assuming it is running 
non-interactively, and won't leave any time free to handle events and 
update the window.  If you just used "R" or "Rterm" as your
command,
you'd get an interactive command-line version of R running, and 
everything should work.

Duncan Murdoch