[R] par(new=T) with xyplot

[Frank E Harrell Jr]

On Wed, 05 Jun 2002 17:52:55 -0400
"Pikounis, V. Bill" <v_bill_pikounis at merck.com> wrote:

> I know I should not mix base plotting functions with grid/lattice functions,
> but I have used a "quick-and-dirty" trick of par(new=T) in the past for
> annotating a trellis-drawn graph in various versions of S-PLUS.  The
> sequence goes something like this:
> 
> > windows(width = 5, height = 5, pointsize = 10)  # open up the device
> 
> > xyplot(y ~ x)  
> > par(new=T)
> > xyplot(y2 ~ x)
> > par(new=F)  
> 
> Using R 1.5.0 in Windows, I tried this for the first time today, and the
> par(new=T) setting appears to be ignored by the second xyplot call; i.e.,
> the frame is cleaned and only the second printing of xyplot appears on the
> device.  (If instead of the second xyplot I use a base plot function like
> plot.default, the frame is not cleaned, which I want to happen). 
> 
> Is there anything analogous to par(new=T) that I could use to achieve this
> behavior of "not cleaning the frame" with lattice commands? Any workaround
> or advice is appreciated.  
> 
> Thanks in advance,
> Bill

Bill - I have had luck just doing par(usr=c(0,1,0,1)).  That's the way I add legends to Lattice graphs using the regular legend command.  [Actually I've used par(usr=c(0,1,0,1),xpd=NA) if it matters.]  But I haven't tried anything with two xyplot calls in a row.  -Frank


> ----------------------------------------
> Bill Pikounis, Ph.D.
> Biometrics Research Department
> Merck Research Laboratories
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-- 
Frank E Harrell Jr              Prof. of Biostatistics & Statistics
Div. of Biostatistics & Epidem. Dept. of Health Evaluation Sciences
U. Virginia School of Medicine  http://hesweb1.med.virginia.edu/biostat
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