R help - Jan 2011 - lattice: how to "center" a title?

Dear expeRts,

As you can see from this example...

trellis.device("pdf", width = 5, height = 5)
  print(xyplot(0 ~ 0, main = "This title is not 'centered' for the
human's eye", scales = list(alternating = c(1,1), tck = c(1,0))))
dev.off()

... the title does not seem to be "centered" for the human's eye
[although it is centered when the plot (width) is considered with the y-axis
label].
I could not easily (via trellis.par.get()) find a way to adjust this. Of course
one could include more spaces in the title string, but is there a more elegant
way to slightly shift the title to the right?

Cheers,

Marius

mhofert wrote:
> 
> trellis.device("pdf", width = 5, height = 5)
>   print(xyplot(0 ~ 0, main = "This title is not 'centered' for
the human's
> eye", scales = list(alternating = c(1,1), tck = c(1,0))))
> dev.off()
> 
> ... the title does not seem to be "centered" for the human's
eye [although
> it is centered when the plot (width) is considered with the y-axis label]. 
> 
This is because there is a y label, and centering is on the page (as you
noted). One way around this would be to add a similar padding at the right
side. See the example below, where I have exaggerated the effect. Try a
padding of 5 instead.

Dieter


library(lattice)
trellis.device("pdf", width = 5, height = 5)
trellis.par.set(layout.widths = list(right.padding = 10))
  print(xyplot(0 ~ 0, main = "This title is not 'centered' for the
human's
eye", scales = list(alternating = c(1,1), tck = c(1,0))))
dev.off()


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Dear Dieter,

many thanks, exactly what I was looking for.

Cheers,

Marius
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