[R] New unique name

[Duncan Murdoch]

I think the function below will tell you all the names that are in
scope at the point where it is called.  You can then make up something
that's not in the list.

Duncan Murdoch

all.names <- function() {
    env <- new.env(parent=parent.frame())
    result <- ls(env=env)
    while (!is.null(env)) {
        env <- parent.env(env)
        result <- c(result, ls(env=env))
    }
    sort(unique(result))
}