R help - Dec 2006 - lattice plots - variables in columns

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

Matt Pocernich said the following on 12/4/2006 12:32 PM:
> 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
> 
Hi, Matt,

Yes. Try this:

my.data <- data.frame(x = 1:10, y1 = 1:10, y2 = 11:20)
xyplot(y1 + y2 ~ x, my.data)
## or if you want y1,y2 in panels
xyplot(y1 + y2 ~ x, my.data, outer = TRUE)

HTH,

--sundar