My guess, continuing from Rolf, is that you should be using conditioning
bwplot(~ y | f2, df, layout=c(3,1))
> On Jan 16, 2022, at 22:22, Rolf Turner <r.tur...@auckland.ac.nz> wrote:
>
> xxx <- trellis.par.get("box.umbrella")
> xxx$lty <- 1
> trellis.par.set(box.umbrella=xxx)
> junk <- rnorm(42)
> bwplot(junk)
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