[R] Different axis limits for each facet in ggplot2

[Karl Ove Hufthammer]

Hi!

Is it possible to have different axis limit for each facet in a ggplot2
plot? Here is an example:

--------------------------------------------------------------
library(ggplot2)

x=seq(-10,10,.1)
y=cos(x)
z=sin(x)*10

dat=melt(data.frame(x,y,z), id.var="x")

qplot( x, value, data=dat, facets=variable~., geom="line" )
--------------------------------------------------------------

Both the x and y axes are now the same for both facets. But since the ranges
of the 'y' and the 'z' variable differ so much, I would prefer their y axes
to be different. This is easy to do in 'lattice':

--------------------------------------------------------------
library(lattice)
xyplot( value~x | variable, data=dat, type="l", layout=c(1,2),
scale=list(y="free") )
--------------------------------------------------------------

Is it possible to do this in 'ggplot2' too? I would have thought that
+ scale_y_continuous(limits=c(NA,NA))
would work, but this sets the 'y' axis to cover the range of 'y' and 'z'
*combined* (which is very sensible as a default, but not what I would
prefer here).

-- 
Karl Ove Hufthammer