[R] par(new=T) with xyplot

[Pikounis, V. Bill]

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 Pikounis, Ph.D.
Biometrics Research Department
Merck Research Laboratories
PO Box 2000, MailDrop RY70-38  
## Please note that as of Wed 12 Jun 2002
## MailDrop will be RY84-16
126 E. Lincoln Avenue
Rahway, New Jersey 07065-0900
USA

v_bill_pikounis at merck.com

Phone: 732 594 3913
Fax: 732 594 1565



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