[R] Call to trellis.focus(); thenpanel.superpose()

[John Maindonald]

The following works fine with the x11 device, though it
may well be that an initial plot is overwritten.  With a pdf
or postscript device, I get two plots, the first of which
still has the red border from having the focus, while the
second is the plot that I want.

         library(lattice); library(grid)
         plt <- xyplot(uptake ~ conc, groups=Plant, data=CO2)
         print(plt)
         trellis.focus("panel", row=1, column=1)
         arglist=trellis.panelArgs()
         arglist$type <- "l"
         do.call("panel.superpose", args=arglist)
         trellis.unfocus()

Should I be able to use panel.superpose() in this way?

The new abilities provided by trellis.focus() etc add
greatly to the flexibility of what can be done with lattice
plots.  The grid-lattice combination is a great piece of
software.

John Maindonald             email: john.maindonald at anu.edu.au
phone : +61 2 (6125)3473    fax  : +61 2(6125)5549
Centre for Bioinformation Science, Room 1194,
John Dedman Mathematical Sciences Building (Building 27)
Australian National University, Canberra ACT 0200.