[R] ggplot2: can one have separate ylim for each facet?

[Etches Jacob]

In lattice

#toy data
library(ggplot2)
library(lattice)
x <- rnorm(100)
y <- rnorm(100)
k <- sample(c("Weak","Strong"),100,replace=T)
j <- sample(c("Tall","Short"),100,replace=T)
w <- data.frame(x,y,j,k)

xyplot(y~x|j+k,scales=list(y=list(relation="free")))

will give you a scale in each subplot with a range equal to the range  
of y within each subplot.

Is this possible using ggplot2?

qplot(x,y,data=w) + facet_grid(j~k) + ylim(-2,2)

produces a plot with the same range in each subplot.  Can the lattice  
behaviour be reproduced in ggplot2?

Thanks,

Jacob Etches