Hi,
I'm trying to understand the code of lattice functions so that I can
write some S4 methods using lattice. The following code is a snipet of
dotplot that is reused in several other functions. I don't understand
why this is needed can someone help ?
Thanks
EJ
[...]
right.name <- deparse(substitute(formula))
try(formula <- eval(formula), silent = TRUE)
foo <- substitute(formula)
if (!(is.call(foo) && foo[[1]] == "~")) {
formula <- as.formula(paste("~", right.name)) #
deparse(foo)))
environment(formula) <- parent.frame()
}
[...]
On 8/25/05, ernesto <ernesto at ipimar.pt> wrote:> Hi, > > I'm trying to understand the code of lattice functions so that I can > write some S4 methods using lattice. The following code is a snipet of > dotplot that is reused in several other functions. I don't understand > why this is needed can someone help ?It was a hack to enable usage of the form dotplot(x). The latest version of lattice does not use this sort of construct any more (replacing it by generics and methods). Deepayan