Re: controlling y axis scale in xyplot

["Richard M. Heiberger" <rmh@temple.edu>]

See
?trellis.args

and read about scales.

I think you are asking for 

tmp <- data.frame(x=1:10, y=rnorm(10), a=rep(1:2, c(5,5)))
xyplot(y ~ x | a, data=tmp, scales=list(y=list(relation="free")))

instead of the default

xyplot(y ~ x | a, data=tmp)


In my example, the default gives a much better view of the relationship
between the y and x variables.