R help - Jun 2002 - Thanks and Summary (was par(new=T) with xyplot)

Thanks very much to Paul Murrell and Frank Harrell for addressing my
original query (repeated at end of this note).  Paul's helpful suggestion
with print.trellis and its more= argument, followed by trellis settings,
works precisely as I needed.
> # snipped from Paul's reply:
> p1 <- xyplot(y ~ x, ylim=c(-5, 5)) 
> p2 <- xyplot(y2 ~ x, pch=16, ylim=c(-5, 5), ylab=" ")
> print.trellis(p1, more=TRUE)
> bg <- trellis.par.get("background")
> bg$col <- "transparent"
> trellis.par.set("background", bg)
> print.trellis(p2)  
One side note: A glitch occurs when I use xYplot() from the Hmisc library
instead of xyplot() from lattice.  The ylim= argument seems to be ignored in
the second plotting call and therefore the y-axes do not line up.  (Frank, I
can discuss more with you about this off-list to see why this happens.)

Thanks again and Best Regards,
Bill 
> -----Original Message-----
> From: Pikounis, V. Bill [mailto:v_bill_pikounis at merck.com]
> Sent: Wednesday, June 05, 2002 5:53 PM
> To: 'r-help at lists.R-project.org'
> Subject: [R] par(new=T) with xyplot
> 
> 
> 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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