R 1.8.1:
___COMMAND____________________________________________
levelplot( yield ~ year * variety | site, barley )
___ERROR_MESSAGE______________________________________
Error in Summary.factor(..., na.rm = na.rm) :
"min" not meaningful for factors
___COMMENT____________________________________________
levelplot( yield ~ as.numeric(year) * as.numeric(variety) | site, barley )
is working but the labels are nasty.
Best regards
Wolfram
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