Lattice: panel.superpose function does not pass subscripts and groups arguments (PR#2377)

Full_Name: Volker Franz
Version: 1.5.1
OS: Debian-Linux
Submission from: (NULL) (134.176.77.64)


Hi,

working with the panel.superpose function, I found out that this
function does not pass the subscripts and groups arguments to
panel.groups functions.

In my view, this seems an unnecessary restriction, because the
subscripts-mechanism which allows to access the original data should
also work if we use the panel.superpose function. (see, "A Tour of
Trellis Graphics": "the subscripts argument is a numeric vector that
tells which observation in the original data is associated with the x-
and y- values"; section 3.2).

The following patch is for the panel.superpose function of the lattice
library.  It ensures that the subscripts and the groups arguments are
passed correctly to panel.groups functions.

For illustration, I append an example which only works with the
patch...

Best
Volker