On 2013-02-25 07:47, Manuel Kunz wrote:
Hi,

I created a xyplot with a three-column layout. As suggested by Deepayan I tried to put 
titles to each column by using xlab.top. Unfortunately, as my y-axis scale relation = 
"free", the column titles are not centered at the three x axes anymore. Any 
idea how to center the titles?

#Example:
require(lattice)
#require(latticeExtra)
e <- data.frame(a = c(1:30), b = c(1:10,  20:29, 990:999),
                 d = c(rep("A", 10), rep("B", 10), rep("C", 10)))
#column titles centered for relation = "same"
xyplot(b ~ a | d, e,
        scales = list(y = list(relation = "same", rot = 0)),
        aspect = 1.8, layout = c(3, 1),
        xlab.top = c("This is centered", "Bla", "Bla")
        )
#column titles not centered for relation = "free"
xyplot(b ~ a | d, e,
        scales = list(y = list(relation = "free", rot = 0)),
        aspect = 1.8, layout = c(3, 1),
        xlab.top = c("This is not centered", "Bla", "Bla")
        )
# end of example

Best regards,
manuel

If this is a one-off, then I would just add a sufficient number of
spaces, obtained by trial and error, to each label.

On the other hand, why not use lattice's built-in facility to put
your labels in the top strips, using the factor.levels argument.
But perhaps your real use is more involved than the example.

Peter Ehlers

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