[R] post - plotting lines in a divided graphic device

Prof Brian Ripley ripley at stats.ox.ac.uk
Fri Nov 21 15:44:05 CET 2008

On Fri, 21 Nov 2008, _ wrote:

> Hi all,
> I have a graphic device divided in 2 areas for a plot.
> Is it possible to add lines or points in the first plot after the last one 
> have been set, without plotting all the data again ?

See ?par, look at mfg.  However, you would probably find screen() easier 
to use, and the way you have done this you have lost the coordinate system 
for the first plot and would need plot(1, new=T) to reset it.

> Example
> par(mfrow(2,1))
> plot(1)
> plot(2)
> lines(c(1,2)) # should be visible in the first plot

That's not a valid R command.

> Thanks for help.
> Greetings
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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

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