R help - Apr 2011 - lattice: how to "center" a subtitle?

Dear expeRts,

I recently asked for a real "centered" title (see, e.g.,
http://tolstoy.newcastle.edu.au/R/e13/help/11/01/0135.html).
A nice solution (from Deepayan Sarkar) is to use "xlab.top" instead of
"main":

library(lattice)
trellis.device("pdf") 
print(xyplot(0 ~ 0, xlab.top = "This title is now 'centered' for
the human's eye", sub = "but subtitles are not centered",
scales = list(alternating = c(1,1), tck = c(1,0))))
dev.off()

My question is whether there is something similar for *sub*titles [so something
like "xlab.bottom"]? As you can see from the plot, the subtitle does
not seem to be "centered" for the human's eye. I would like to
center it according to the x-axis label.

Cheers,

Marius

On Apr 4, 2011, at 7:39 AM, Marius Hofert wrote:
> Dear expeRts,
>
> I recently asked for a real "centered" title (see, e.g.,
http://tolstoy.newcastle.edu.au/R/e13/help/11/01/0135.html)
> .
> A nice solution (from Deepayan Sarkar) is to use "xlab.top"
instead
> of "main":
>
> library(lattice)
> trellis.device("pdf")
> print(xyplot(0 ~ 0, xlab.top = "This title is now 'centered'
for the
> human's eye", sub = "but subtitles are not centered",
scales =
> list(alternating = c(1,1), tck = c(1,0))))
> dev.off()
library(lattice)
trellis.device("pdf")
print(xyplot(0 ~ 0, xlab.top = "This title is now 'centered' for
the
human's eye", xlab = "but subtitles are _now_ centered",
scales =
list(alternating = c(1,1), tck = c(1,0))))
dev.off()


(I realize that those are not really subtitles by a 'lab', but that  
appears acceptable in your current test case.)
>
> My question is whether there is something similar for *sub*titles  
> [so something like "xlab.bottom"]? As you can see from the plot,
the
> subtitle does not seem to be "centered" for the human's eye.
I would
> like to center it according to the x-axis label.
>

David Winsemius, MD
West Hartford, CT