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

[Frank Harrell]

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.

Frank


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Frank Harrell
Department of Biostatistics, Vanderbilt University
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