I'm trying to use a lattice function within a function and have problems
passing the "groups" argument properly. Let's say I have a data frame
d <- data.frame(x = rnorm(100), y = c("a", "b"))
and want to plot variable x in a densityplot, grouped by the variable y, then
I would do something like
densityplot(~ x, d, groups = y)
If however I wanted to call the function "densityplot" within a function and
pass the "groups" argument as an argument of that function, how would I have
to proceed? It is not as straightforward as
f <- function(data, groupvar) {
densityplot(~ x, data, groups = groupvar)
}
probably because the lattice function "densityplot.formula" preprocesses
the "groups" argument with
groups <- eval(substitute(groups), data, environment(formula))
It there a way how I could pass the "groups" argument in the function "f"?
Thanks for any hints,
Thomas Zumbrunn
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