[R] Syntax for lattice scales argument with |a*b

[David Winsemius]

On May 30, 2011, at 11:18 AM, Frank Harrell wrote:

> I have not been able to figure out the format for specifying limits,  
> at,
> labels in scales <- list(relation='free', limits=..., at=...,  
> labels=...)
> when there is more than one paneling variable, e.g., xyplot(y ~ x |  
> a*b).
> Thanks for any guidance.

I think that xyplot(y ~ x | a*b) is the same as xyplot(y ~ x | a+b).  
If so, then this 2006 Sarkar posting may be on point:

http://finzi.psych.upenn.edu/R/Rhelp02/archive/72017.html

Best;
--

David Winsemius, MD
West Hartford, CT