Mutiple page trellis plots with relation = "free" or "sliced"

Yes. The number of pages in my layout argument (200) was greater than
the number of unique values in my conditioning variable (168). Changing
to layout = c(1, 1, 168) solves the problem. 

Very sorry, I should have thought of that. 

Thanks so much for your response, and many, many thanks for implementing
lattice. It is incredibly powerful and a joy to use. 

Jim 

-----Original Message-----
From: Deepayan Sarkar [mailto:deepayan at stat.wisc.edu] 
Sent: Friday, December 06, 2002 1:55 PM
To: Jim Rogers; r-help at stat.math.ethz.ch
Subject: Re: [R] Mutiple page trellis plots with relation = "free" or
"sliced"

Hello,

Has anyone out there encountered a problem like this:

xyplot(Plasma ~ Serum | Analyte,
       data = sp.df,
       aspect = 1,
       layout = c(1, 1, 200),
       scales = list(relation = "free")
       )

Gives the error:

Error in pretty(x[is.finite(x)], ...) : x must be numeric

No, this is supposed to work. I'm not sure where the problem might be,
but it 
could have something to do with panels without any data in them. Does
that 
happen in your case ?