[R] lattice plots - variables in columns

[Matt Pocernich]

I an using xyplot in lattice.  I have data in a dataframe.  Some columns
contains data, each from a different group.  Is there a direct way to 
specify a range of column names as a grouping variables?  Currently, I 
am stacking the data and creating a column with names.

Thanks,

Matt

-- 
Matt Pocernich
National Center for Atmospheric Research
Research Applications Laboratory
(303) 497-8312