[R] [lattice] group by two factors

[tpoisot]

Hi all,

I'm working on a dataframe (webs) with two variables ($size, $vspe), and two
grouping factors ($type, $mutu). I would like to do a lattice plot wherein
the levels of $mutu would be different shapes, and the levels of $type
different colors. Additionally, I'd like to add a regression line for the
two levels od $mutu only (no matter what the value of $type is).

It's super easy to do in ggplot2  :

ggplot(webs,aes(y=vspe,x=size)) + geom_point(aes(shape=mutu,colour=type)) +
geom_smooth(aes(group=mutu,linetype=mutu),method='lm',fill=NA)

However, I'm have no idea about how to do it in lattice. Does someone have
any advice?

Thanks

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