[Lattice] Incrase the height of strips in Trellis plots

-----Oprindelig meddelelse-----
Fra: r-help-bounces at stat.math.ethz.ch 
[mailto:r-help-bounces at stat.math.ethz.ch] P? vegne af Bernd Weiss
Sendt: 5. september 2007 06:48
Til: r-help at stat.math.ethz.ch
Emne: [R] [Lattice] Incrase the height of strips in Trellis plots

Dear all,

I wonder how to increase the height of strips via 
strip.default or strip.custom. The following example 
hopefully illustrates the difficulty I am facing:

library(lattice)
xyplot(Petal.Length ~ Petal.Width | Species, iris,
        strip = strip.custom(par.strip.text = list(cex = 2)))

Thanks for any advice,

Bernd

version

               _
platform       i386-pc-mingw32
arch           i386
os             mingw32
system         i386, mingw32
status
major          2
minor          5.1
year           2007
month          06
day            27
svn rev        42083
language       R
version.string R version 2.5.1 (2007-06-27)

This should give you something close to what you want:


xyplot(Petal.Length ~ Petal.Width | Species, iris,
       strip = strip.custom(par.strip.text = list(cex = 2)),
       par.settings = list(layout.heights=list(strip=1.45)))

The par.settings argument alters locally the default par settings of lattice plots, see e.g. ?trellis.par.get and the ?xyplot about the par.settings argument.

A closer inspection (try using strip = 2 or numbers less than 1.45 in stead of strip = 1.45) of the figure reveals that there are some problems with vertical alignment of the strip text, i.e. not centered. 

To remedy this I think that you have to use you own strip function. You may be able to build you own function by altering the default strip function, see ?lattice.options and try lattice.options() at the command prompt. However this may be more difficult than it seems at first. Perhaps some one more familiar with the lattice package can solve this.

This should give you something close to what you want:


xyplot(Petal.Length ~ Petal.Width | Species, iris,
       strip = strip.custom(par.strip.text = list(cex = 2)),
       par.settings = list(layout.heights=list(strip=1.45)))

The par.settings argument alters locally the default par settings of lattice
plots, see e.g. ?trellis.par.get and the ?xyplot about the par.settings
argument.