Interaction and other new features in the lattice package
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Lattice is an add-on package that implements Trellis graphics for R
using low-level capabilities of the grid package.  Lattice provides
most of the features available in the original S-PLUS implementation.
In addition, it has several unique features of its own, some of which
were outlined in DSC-2003.  Since then, there have been further
enhancements to the lattice package.  Most significant among these is
the ability to easily add to lattice plots after they are drawn,
including functionality similar to the 'locator' and 'identify'
functions for standard R graphics.  This paper will describe the API
for such usage, which is somewhat non-trivial because unlike standard
R graphics, lattice plots typically consist of more than one panel.
It will also give a brief overview of other recent encancements to
lattice.


Deepayan Sarkar
Dept of Statistics
University of Wisconsin-Madison