[R] lattice: how to "center" a subtitle?

[Marius Hofert]

Dear David,

do you know how to get plotmath-like symbols in both rows?
I tried s.th. like:

lab <- expression(paste(alpha==1, ", ", beta==2, sep=""))
xlab <- substitute(expression( atop(lab==lab., bold(foo)) ), list(lab.=lab))
xyplot(0 ~ 0, xlab = xlab)

Cheers,

Marius

On 2011-04-04, at 18:59 , David Winsemius wrote:

> 
> On Apr 4, 2011, at 12:45 PM, Marius Hofert wrote:
> 
>> Dear David,
>> 
>> I intended to use another x-label. But your suggestion brings me to the idea of just using a two-line xlab, so s.th. like
>> print(xyplot(0 ~ 0, xlab.top = "This title is now 'centered' for the human's eye", xlab = "but subtitles are _now_ centered\nbla", scales = list(alternating = c(1,1), tck = c(1,0))))
> 
> And if you wanted different fontface (underline, italic or bold) then you could use plotmath expressions:
> 
> xyplot(0 ~ 0, xlab.top = "This title is now 'centered' for the human's eye", xlab = expression( atop(but~subtitles2~are~underline(now)~centered, bold(bla) )), scales = list(alternating = c(1,1), tck = c(1,0)))
> 
> -- 
> David.
> 
>> 
>> Thanks!
>> 
>> Cheers,
>> 
>> Marius
>> 
>> On 2011-04-04, at 16:47 , David Winsemius wrote:
>> 
>>> 
>>> 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
>>> 
>> 
> 
> David Winsemius, MD
> West Hartford, CT
>